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Caterpillar Fault Codes

307 Caterpillar generator fault/alarm codes with symptom, cause and remedy — compiled from Caterpillar service and controller documentation.

Fault / alarm codes

307

Code	Meaning / symptom	Cause	Remedy	Models affected
$0000	Valid Data			Caterpillar EMCP 3.1, Caterpillar EMCP 3.2, Caterpillar EMCP 3.3
$0001	Error			Caterpillar EMCP 3.1, Caterpillar EMCP 3.2, Caterpillar EMCP 3.3
$83	Exception Response to Read Registers Query			Caterpillar EMCP 3.1, Caterpillar EMCP 3.2, Caterpillar EMCP 3.3
$86	Exception Response to Write Single Register Query			Caterpillar EMCP 3.1, Caterpillar EMCP 3.2, Caterpillar EMCP 3.3
$90	Exception Response to Write Multiple Registers Query			Caterpillar EMCP 3.1, Caterpillar EMCP 3.2, Caterpillar EMCP 3.3
0	Exhaust TEMP Fault and Analog Temperature SHUTDOWN Input Circuit Fault
03	An active 0-3 diagnostic code is present.		Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.	Caterpillar 3508B GENERATOR SET CNB, Caterpillar CNB00001-UP(SEBP3301 - 24)
04	An active 0-4 diagnostic code is present.		Check the Analog Supply Voltage at the Sensor Connectors and then Check the Analog Supply Voltage at the ECM. If the supply voltage is not correct, replace the ECM.	Caterpillar 3508B GENERATOR SET CNB, Caterpillar CNB00001-UP(SEBP3301 - 24)
04 (Short to Ground)	There is a short circuit diagnostic code for the suspect sensor.		Use a suitable piece of wire to short terminal B (Analog Return) and terminal C (Signal) at the harness side of the suspect sensor connector. Check for active diagnostic codes on Cat ET.	Caterpillar 3456 GENERATOR SET C4G
08	An active 0-8 diagnostic code is present.			Caterpillar 3508B GENERATOR SET CNB, Caterpillar CNB00001-UP(SEBP3301 - 24)
1	Temperature EXHAUST TEMP Fault and Analog P SHUTDOWN Input Circuit Fault
100 1	Low Engine Oil Pressure		LOW ENGINE Data Link circuit Fault	Caterpillar CNB1-Up
100 17	PRESS WARNING Fault and Digital Input Circuit
100-11	Very Low Oil Pressure			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
1000; 1900; 1901; 1902	The “DIAGNOSTIC” lamp is used to indicate the existence of an active fault by flashing codes.			Caterpillar 3126B, Caterpillar SEBU7772-02
105-11	Very High Intake Manifold Air Temperature			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
107 0	High Air Filter Differential		HIGH AIR FILTER \| Digital Input Circuit	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
107 1	Low Air Filter Differential		LOW AIR FILTER \| Digital Input Circuit	Caterpillar CNB1-Up
107 15	High Air Filter Differential Pressure Warning			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
107 17	Low Air Filter Differential Pressure Warning			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
107 3	Air Filter Differential Pressure Sensor Short		PRES SENSOR Fault (High SHORT)	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
107 4	Low Air Filter Differential Pressure Shutdown			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
110 0	High Engine Coolant Temperature		HIGH ENGINE Data Link Circuit Fault	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
110 15	High Engine Coolant Temperature Warning			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
110 17	Low Engine Coolant Temperature		TEMP WARNING and Digital Input Circuit	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
110-11	Very High Coolant Temperature			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
111	High Engine Coolant	HIGH ENG COOL \| Digital Input Circuit Level Warning LEVEL WARNING § \| Fault and Analog Input Circuit Fault
111 0	High Engine Coolant Level		COOL LEVEL Fault and Analog Input	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
111 1	Low Engine Coolant Level		COOL LEVEL Fault and Analog Input	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
111 15	HIGH ENG COOL LEVEL WARNING Fault and Analog
111 17	Low Engine Coolant Level Warning			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
111 3	Engine Coolant Level Sensor Short (High)		SENSOR SHORT HIGH	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
111 4	Engine Coolant Level Sensor Short (Low)		SENSOR SHORT LOW	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
111-11	Very Low Coolant Level			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
1122 0	HIGH GEN #1 BEARING TEMP	Shutdown Input Circuit Fault - Generator	SHUTDOWN Fault and Analog Input Circuit Fault
1122 1	LOW GEN REAR BEARING TEMP	Shutdown Input Circuit Fault - Generator	SHUTDOWN Fault and Analog Input Circuit Fault
1122 15	HIGH GEN REAR BEARING TEMP WARNING	Warning Input Circuit Fault - Generator	WARNING Fault and Analog Input Circuit Fault
1122 17	LOW GEN REAR BEARING TEMP WARNING	Warning Input Circuit Fault - Generator	WARNING Fault and Analog Input Circuit Fault
1122 3	GEN REAR BEARING TEMP SENSOR SHORT HIGH	Generator Rear - BEARING TEMP Analog Input Circuit	SENSOR SHORT Fault
1122 4	GEN REAR BEARING TEMP SENSOR SHORT LOW	Generator Rear - BEARING TEMP Analog Input Circuit	SENSOR SHORT Fault
113	Cylinder 2 Fault		Service	Caterpillar 1100 Series
114 15	High Engine Coolant Level Warning			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
117	Cylinder 1 Fault		Service	Caterpillar 1100 Series
12	Sensing System SYS FAILURE Sensing Circuit Fault
1231 11	ACCESSORY DATA LINK FAULT		DATA LINK FAULT
12339 3	FUEL TANK LEAK Fault	Digital Input Circuit
1239	Ruptured Fuel Basin-Primary Tank
1239 31	FUEL TANK LEAK (FUEL Rupture Basin)		Fault
133	Intake Manifold Temperature Sensor Fault		Service	Caterpillar 1100 Series
137	High Fire Extinguisher	HIGH FIRE \| Digital Input Circuit Pressure Shutdown EXTNG PRES Fault and Analog Input SHUTDOWN Circuit Fault
137 0	HIGH FIRE EXTNG PRES SHUTDOWN Fault and Analog
137 1	LOW FIREEXTNG PRES SHUTDOWN Fault and Analog
137 15	HIGH FIRE EXTNG Pressure Warning - Digital Input Circuit
137 17	LOW FIREEXTNG Pressure Warning - Digital Input Circuit
137 3	FIRE EXTING SENSOR SHORT - Analog Input Circuit
137 4	FIRE EXTNG PRES Analog Input Circuit
142	Pump Timing Sensor Fault		Service	Caterpillar 1100 Series
143	Timing Calibration Fault		Service	Caterpillar 1100 Series
144	Crank Timing Sensor Fault		Service	Caterpillar 1100 Series
1450	Cold Start Strategy Activation			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
15	Temperature EXHAUST TEMP Fault and Analog PS WARNING Input Circuit Fault
162	High Pressure Fuel Pump Fault		Service	Caterpillar 1100 Series
1664	Engine Failure to Start Shutdown
1664 31	ENGINE FAILURE TO START	Start Shutdown	SHUTDOWN Warning Engine Overcrank
167	Low Battery Charging System	LOW BATTERY Charging System \| System Voltage Warming CHARGING SYS VOLT WARN
167 17	Low Battery Charging System		CHARGING SYS VOLT WARN	Caterpillar CNB1-Up
168	High Battery Voltage	HIGH BATTERY Charging System \| Shutdown VOLTAGE SHUTDOWN
168 0	VOLTAGE SHUTDOWN - Charging System
168 15	VOLTAGE WARNING - Charging System
168 17	Low Battery Voltage			Caterpillar CNB1-Up
168 Q	High Battery Voltage			Caterpillar CNB1-Up
169	Coolant Temperature Sensor Fault		Service	Caterpillar 1100 Series
17	Temperature EXHAUST TEMP Fault and Analog PY WARNING Input Circuit Fault
171	High Ambient Air Temperature	HIGH AMBIENT Digital Input Circuit \| AIR TEMP Fault and Analog Input SHUTDOWN Circuit Fault
171 0	High Ambient Air Temperature			Caterpillar CNB1-Up
171 1	LOW AMBIENT AIR TEMP SHUTDOWN - Analog Input Circuit
171 3	Ambient Air Temperature Sensor Short	TEMP SENSOR Fault	TEMP SENSOR Fault (SHORT HIGH)	Caterpillar CNB1-Up
171 4	Low Ambient Air Temperature		TEMP SENSOR Fault (SHORT LOW)	Caterpillar CNB1-Up
173	High Exhaust Temperature	HIGH EXHAUST Digital Input Circuit \| TEMP Fauit and Analog Input SHUTDOWN Circuit Fault
173 0	High Exhaust Temperature			Caterpillar CNB1-Up
173 1	LOW EXHAUST TEMP SHUTDOWN - Analog Input Circuit
173 3	Exhaust Temperature Sensor Short	TEMP SENSOR Fault	SENSOR SHORT HIGH	Caterpillar CNB1-Up
173 4	Low Exhaust Temperature		SENSOR SHORT LOW	Caterpillar CNB1-Up
175	High Engine Oil Temperature	HIGH ENGINE Digital Input Circuit \| OIL TEMP Fault and Analog Input SHUTDOWN Circuit Fault
175 0	High Engine Oil Temperature			Caterpillar CNB1-Up
175 1	Temperature TEMP SHUTDOWN \| Fault and Analog	Shutdown Input Circuit Fault - Engine Oil
175 15	Temperature HIGH ENGINE OIL \| eault and Analog	Shutdown Input Circuit Fault - Engine Oil
175 17	Temperature TEMP Worthing a Fault and Analog	Warning Input Circuit Fault - Engine Oil
175 3	Engine Oil Temperature Sensor Short	SENSOR SHORT	SENSOR SHORT HIGH	Caterpillar CNB1-Up
175 4	Sensor Short Low Fault	Engine Oil - ENGINE OIL TEMP
176	Low Engine Oil Temperature	LOW ENGINE Digital Input Circuit \| OIL TEMP Fault and Analog Input SHUTDOWN Circuit Fauit
176 4	Low Engine Oil Temperature			Caterpillar CNB1-Up
18	SHORT HIGH
187	Oil Pressure Sensor Fault		Service	Caterpillar 1100 Series
190	Engine Over Speed	ENGINE OVER SPEED Shutdown OVER SPEED Warning SHUTDOWN
190 0	Engine Over Speed	Shutdown Input Circuit Fault - Engine Speed		Caterpillar CNB1-Up
190 1	Engine Under Speed	Engine Under Speed		Caterpillar CNB1-Up
190 17	Engine Under Speed Warning			Caterpillar CNB1-Up
190 2	Engine Speed Sensor Erratic or Not Present	SENSOR Fault		Caterpillar CNB1-Up
190 5	Engine Speed Sensor Open	SENSOR OPEN Fault		Caterpillar CNB1-Up
190 7	SPEED WARNING	Warning Input Circuit Fault - Engine Speed
190-00	Engine Overspeed Warning			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
1900	Overspeed			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
1907	Overspeed			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
1912	Overspeed			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
197	Intake Manifold Pressure Sensor Fault		Service	Caterpillar 1100 Series
2	Frequency FREQ MISMATCH Generator Output Generator Output Mismatch Warning WARN Generator Output Generator Output
21	Fault shutdown			Caterpillar 3306B, Caterpillar 3406, Caterpillar 3406E, Caterpillar 3412C, Caterpillar 3412C Generator Set, Caterpillar 3456
22	Fault alarm			Caterpillar 3306B, Caterpillar 3406, Caterpillar 3406E, Caterpillar 3412C, Caterpillar 3412C Generator Set, Caterpillar 3456
2301A Control	When the engine oil pressure is increased beyond the low oil pressure setpoint, the GSC will inform the governor that the engine speed should be increased from IDLE to RATED rpm.			Caterpillar SR4B
2433	High Right Digital Input Circuit
2433 0	HIGH RIGHT EXHAUST TEMP		SHUTDOWN Fault and Analog Input Circuit Fault
2434	High Left Exhaust HIGH LEFT Digital Input Circuit
2436	Generator Over GEN OVER Generator Over
2437	Ruptured Fuel Basin - Primary Tank
2440	Generator Over GEN OVER Generator Over
2448	Generator Over GEN OVER Generator Over
2452	Generator Reverse GEN REVERSE Power Shutdown POWER Power Warning
2456	Generator Reactive Power (VAR)
2648	Maintenance INTERVAL Service Hyormation Interval Warning WARNING Interval Warning
3	Temperature Hich TEMP SENSOR Analog Input Circuit
31	Air Damper AIR DAMPER Digital Input Circuit Closed CLOSED Fault
3111	0			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
38 0	External Tank High Fuel Level Shutdown	Digital Input Circuit or Analog Input Circuit Fault	Fault and Analog Input Circuit Fault	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
38 1	External Tank Low Fuel Level Shutdown	Digital Input Circuit or Analog Input Circuit Fault	Fault and Analog Input Circuit Fault	Caterpillar CNB1-Up
38 15	External Tank High Fuel Level Warning FUEL LVL Fault and Analog Input WARNING Circuit Fault	External Tank Analog Input Circuit Fault		Caterpillar CNB1-Up
38 17	External Tank Low Fuel Level Warning	Digital Input Circuit or Analog Input Circuit Fault	Fault and Analog Input Circuit Fault	Caterpillar CNB1-Up
38 3	External Tank Fuel Level Sensor Short High	External Tank Analog Input Circuit Fault	Analog Input Circuit Fault	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
38 4	External Tank Fuel Level Sensor Short Low	External Tank Analog Input Circuit Fault	Analog Input Circuit Fault	Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
38 46	External Tank High Fuel Level Warning	Digital Input Circuit or Analog Input Circuit Fault	Fault and Analog Input Circuit Fault	Caterpillar CNB1-Up
4	Temperature OW TEMP SENSOR Analog Input Circuit
4000	ATS in Normal ATS IN NORMAL Digital Input Circuit Position POSITION Fault
4001	ATS in Normal Position
4002	Gen Supplying Load
4003	Battery Charger CHARGER FAILURE Digital Input Circuit Failure Fault
4004	Gen Breaker Closed
4005	Utility Circuit UTILITY BREAKER \|\| Digital Input Circuit Breaker Closed CLOSED Fault
4006	Engine in Cooldown Shutdown
4007	Generator Control GEN CONTROL Generator Control Not NOTIN AUTO In Automatic Warning WARNING
4008	Unexpected Engine Shutdown
4009	Generator Breaker Failure to Open
4010	Utility Breaker Failure to Open
4015	Utility to Generator Transfer Failure Warning/Shutdown
4016	Generator to Utility Transfer Failure Warning
4017	Loss of Utility
414	Low Engine Coolant	LOW ENG COOL \| Digital Input Circuit Level Warning LEVEL WARNING \| Fault and Analog Input Circuit Fault
414 17	Low Engine Coolant			Caterpillar CNB1-Up
422	Intermittent Battery Power to ECM		Schedule Service	Caterpillar 1100 Series
439	Key Switch Fault		Service	Caterpillar 1100 Series
489	Fuel Rail Pressure Sensor Fault		Service	Caterpillar 1100 Series
516	Sensor Supply Voltage Fault		Check Customer Parameters or System Parameters	Caterpillar 1100 Series
517	Sensor Supply Voltage Fault		Schedule Service	Caterpillar 1100 Series
527	System Parameters Fault		Check Customer Parameters or System Parameters	Caterpillar 1100 Series
55	Diagnostic Code 55			Caterpillar 3406E
551	Flash Code 551 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position.			Caterpillar C4.4 Industrial Engine, Caterpillar SEBU8180-01
6 0	High Fuel Level Shutdown	Digital Input Circuit Fault
6 1	Low Fuel Level Shutdown	Digital Input Circuit Fault
625	SCADA Data Link Fault	SCADA DATA LINK \| Data Link Circuit Fault FAULT
625 11	SCADA Data Link Fault			Caterpillar CNB1-Up
628	Voltage Regulator Failure
639	Primary Data Link Fault	PRIMARY DATA LINK FAULT \| Data Link Circuit Fault
639 11	Primary Data Link Fault	Data Link Circuit		Caterpillar CNB1-Up
701	Custom Event #1 High Shutdown	CUSTOM Digital input Circuit HIGH Fautt SHUTDOWN
701 0	CUSTOM EVENT #1 HIGH	Custom Event #1 - High Shutdown	SHUTDOWN
701 1	Custom Event #1 Low	Digital Input Circuit	SHUTDOWN	Caterpillar CNB1-Up
701 15	CUSTOM EVENT #1 HIGH	Custom Event #1 - Low Shutdown	WARNING
701 17	CUSTOM EVENT #1 LOW		WARNING
701 3	CUSTOM EVENT #1	Digital Input Circuit
701 31	Custom Event #1 Status ACTIVE		ACTIVE	Caterpillar CNB1-Up
701 7	LOW WARNING Fault	Custom Event #1 - Low Warning
701 i	Custom Event #1 High			Caterpillar CNB1-Up
702	Custom Event #2 High Shutdown	CUSTOM Digital Input Circuit HIGH Fault SHUTDOWN
702 0	Custom Event #2 High	Custom Event #2 - High Shutdown	SHUTDOWN	Caterpillar CNB1-Up
702 1	Custom Event #2 Low	Digital Input Circuit	SHUTDOWN	Caterpillar CNB1-Up
702 15	CUSTOM EVENT #2 HIGH	Custom Event #2 - Low Shutdown	WARNING
702 17	CUSTOM EVENT #2 LOW		WARNING
702 3	CUSTOM EVENT #2	Digital Input Circuit
702 31	Custom Event #2 Status ACTIVE		ACTIVE	Caterpillar CNB1-Up
702 7	LOW WARNING Fault	Custom Event #2 - Low Warning
703	Custom Event #3 High Shutdown	CUSTOM Digital input Circuit HIGH Fault SHUTDOWN
703 0	CUSTOM EVENT #3 HIGH	Custom Event #3 - High Shutdown	SHUTDOWN
703 1	CUSTOM EVENT #3 LOW	Digital Input Circuit	SHUTDOWN
703 15	CUSTOM EVENT #3 HIGH	Custom Event #3 - Low Shutdown	WARNING
703 17	CUSTOM EVENT #3 LOW		WARNING
703 3	CUSTOM EVENT #3	Digital Input Circuit
703 31	CUSTOM EVENT #3 STATUS		ACTIVE
703 7	LOW WARNING Fault	Custom Event #3 - Low Warning
703 i	Custom Event #3 High			Caterpillar CNB1-Up
704 0	CUSTOM EVENT #4 HIGH	Custom Event #4 - High Shutdown	SHUTDOWN
704 1	CUSTOM EVENT #4 LOW	Digital Input Circuit	SHUTDOWN
704 15	CUSTOM EVENT #4 HIGH	Custom Event #4 - Low Shutdown	WARNING
704 17	CUSTOM EVENT #4 LOW		WARNING
704 3	CUSTOM EVENT #4	Digital Input Circuit
704 31	CUSTOM EVENT #4 STATUS		ACTIVE
704 7	LOW WARNING Fault	Custom Event #4 - Low Warning
705 0	CUSTOM EVENT #5 HIGH	Custom Event #5 - High Shutdown	SHUTDOWN
705 1	CUSTOM EVENT #5 LOW	Digital Input Circuit	SHUTDOWN
705 15	CUSTOM EVENT #5 HIGH	Custom Event #5 - Low Shutdown	WARNING
705 17	CUSTOM EVENT #5 LOW		WARNING
705 3	CUSTOM EVENT #5	Digital Input Circuit
705 31	CUSTOM EVENT #5 STATUS		ACTIVE
705 7	LOW WARNING Fault	Custom Event #5 - Low Warning
706 0	CUSTOM EVENT #6 HIGH	Custom Event #6 - High Shutdown	SHUTDOWN
706 1	CUSTOM EVENT #6 LOW	Digital Input Circuit	SHUTDOWN
706 15	CUSTOM EVENT #6 HIGH	Custom Event #6 - Low Shutdown	WARNING
706 17	CUSTOM EVENT #6 LOW		WARNING
706 3	CUSTOM EVENT #6	Digital Input Circuit
706 31	CUSTOM EVENT #6 STATUS		ACTIVE
7427	Overspeed			Caterpillar C15 Generator Set, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
8 0	High Engine Oil Level Shutdown	Digital Input Circuit Fault
8 1	Low Engine Oil Level Shutdown	Digital Input Circuit Fault
82	STARTING AIR PRES SENSOR SHORT HIGH
82 0	High Starting Air Pressure Shutdown	Starting Air Digital Input Circuit Fault	Digital Input Circuit Fault	Caterpillar CNB1-Up
82 1	Low Starting Air Pressure Shutdown AIR PRES Fault and Analog Input SHUTDOWN Circuit Fault	Starting Air Digital Input Circuit Fault		Caterpillar CNB1-Up
82 15	High Starting Air Pressure Warning AIR PRES Fault and Analog Input WARNING Circuit Fault	Starting Air Analog Input Circuit Fault		Caterpillar CNB1-Up
82 17	Low Starting Air Pressure Warning AIR PRES Fault and Analog Input WARNING Circuit Fault	Starting Air Analog Input Circuit Fault		Caterpillar CNB1-Up
82 3	Starting Air Pressure Sensor Short High	Analog Input Circuit Fault		Caterpillar CNB1-Up
82 4	Starting Air Pressure Sensor Short Low	Analog Input Circuit Fault		Caterpillar CNB1-Up
8234	Load reduction from alarm system to LESS			Caterpillar VM 43 C
84-00	Vehicle Overspeed Warning			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
84-14	Quick Stop Occurrence			Caterpillar 3406E, Caterpillar C, Caterpillar CATERPILLAR 3406E
924 3	DIGITAL OUTPUT #1 SHORT	Digital Output Circuit	HIGH Fault
925 3	DIGITAL OUTPUT #2 SHORT	Digital Output Circuit	HIGH Fault
9401	Engine speed binary suppression of alarms			Caterpillar VM 43 C
9402	Engine speed binary start stand-by pump			Caterpillar VM 43 C
9404	Overspeed – alarm binary			Caterpillar VM 43 C
9406	Switch off lube oil stand-by pump binary			Caterpillar VM 43 C
9407	Engine speed binary n adjustable			Caterpillar VM 43 C
9419	Engine speed signal From RPM switching equipment – indication, DICARE 4-20 mA			Caterpillar VM 43 C
9419.1	Pick up RPM switching equipment 0-15 KHz			Caterpillar VM 43 C
9429A	Turbine speed high – alarm Turbine speed – indication, DICARE 4-20 mA 0-10 V			Caterpillar VM 43 C
95 0	High Fuel Filter Differential Pressure Shutdown FLTR DIFF PRES Fault and Analog Input SHUTDOWN Circuit Fault	Fuel Filter Digital Input Circuit Fault		Caterpillar CNB1-Up
95 1	Low Fuel Filter Differential Pressure Shutdown FLTR DIFF PRES Fault and Analog Input SHUTDOWN Circuit Fault	Fuel Filter Digital Input Circuit Fault		Caterpillar CNB1-Up
95 15	High Fuel Filter Differential Pressure Warning FLTR DIFF PRES Fault and Analog Input WARNING Circuit Fault	Fuel Filter Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
95 17	Low Fuel Filter Differential Pressure Warning FLTR DIFF PRES Fault and Analog Input WARNING Circuit Fault	Fuel Filter Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
95 3	Fuel Filter Differential Pressure Sensor Short High	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
95 4	Fuel Filter Differential Pressure Sensor Short Low	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
9503	Limit switch Control lever at fuel rack – stop position binary			Caterpillar VM 43 C
9509	Distance sensor / switching device Fuel setting 4-20 mA			Caterpillar VM 43 C
9531	Engine overload at rated speed binary			Caterpillar VM 43 C
96 0	High Fuel Level Shutdown FUEL LEVEL SHUTDOWN Fault and Analog Input Circuit Fault			Caterpillar CNB1-Up
96 1	Low Fuel Level Shutdown FUEL LEVEL SHUTDOWN Fault and Analog input Circuit Fault			Caterpillar CNB1-Up
96 15	High Fuel Level Warning HIGH FUEL LEVEL Fault and Analog Input WARNING Circuit Fault	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
96 17	Low Fuel Level Warning LOW FUEL LEVEL Fault and Analog Input WARNING Circuit Fault	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
96 3	Fuel Level Sensor Short High	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
96 4	Fuel Level Sensor Short Low	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
9602	Relay contact CANbus failure – alarm binary			Caterpillar VM 43 C
9615	Failure electrical governor – minor alarm binary			Caterpillar VM 43 C
9616	Failure mechanical governor – major alarm binary			Caterpillar VM 43 C
9671.1	Automatic stop failure - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9671.2	Overspeed failure - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9671.3	Emergency failure – alarm binary			Caterpillar VM 43 C
9674	Overspeed - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9675	Emergency stop - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9676	Common alarm load reduction			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9677.1	Override oil mist detector activated binary			Caterpillar VM 43 C
9677.2	Override load reduction activated			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
970 31	EMERGENCY STOP	Digital Input Circuit	SHUTDOWN Fault
9717	Voltage failure at terminal X3 - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9751	Voltage failure at charge air temperature controller			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9771	Freshwater preheater voltage failure			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
98 0	High Engine Oil Level Shutdown ENGINE OIL LVL SHUTDOWN Fault and Analog Input Circuit Fault			Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
98 1	Low Engine Oil Level Shutdown ENGINE OIL LVL SHUTDOWN Fault and Analog input Circuit Fault			Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
98 15	High Engine Oil Level Warning ENGINE OIL LVL WARNING Fault and Analog Input WARNING Circuit Fault	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
98 17	Low Engine Oil Level Warning ENGINE OIL LVL WARNING Fault and Analog Input WARNING Circuit Fault	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
98 3	Engine Oil Level Sensor Short High	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
98 4	Engine Oil Level Sensor Short Low	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
9836.1	Sensor/isolation fault A01 - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9836.2	Sensor/isolation fault A02 - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
99 0	High Oil Filter Differential Pressure Shutdown DIFF PRES Fault and Analog Input SHUTDOWN Circuit Fault	Digital Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
99 1	Low Oil Filter Differential Pressure Shutdown DIFF PRES Fault and Analog Input SHUTDOWN Circuit Fault	Digital Input Circuit Fault		Caterpillar CNB1-Up
99 15	High Oil Filter Differential Pressure Warning DIFF PRES Fault and Analog Input WARNING Circuit Fault			Caterpillar CNB1-Up
99 17	Low Oil Filter Differential Pressure Warning DIFF PRES Fault and Analog Input WARNING Circuit Fault		LOW OIL FILTER Digital Input Circuit	Caterpillar CNB1-Up
99 3	Oil Filter Differential Pressure Sensor Short High	Analog Input Circuit Fault		Caterpillar CNB1-Up
99 4	Oil Filter Differential Pressure Sensor Short Low	Analog Input Circuit Fault		Caterpillar C15 Generator Set, Caterpillar CNB1-Up, Caterpillar EMCP 3, Caterpillar SEBU7909-01, Caterpillar SEBU7969-01
9962.1	Common alarm A01 - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
9962.2	Common alarm A02 - alarm			Caterpillar 6 M 20 C, Caterpillar 8 M 20 C, Caterpillar 9 M 20 C, Caterpillar VM 43 C
AL	The GSC+P FLASHES the fault alarm indicator and shows a corresponding fault code on the upper display.		Correct the alarm fault.	Caterpillar SXC1-Up
AL1	The GSC issues a high water temperature shutdown when the engine coolant temperature increases to within 6°C (11°F) of setpoint P15.	Engine coolant temperature reaches the setpoint for high water temperature shutdown.	Correct the cause and reset the system.	Caterpillar EMCP II
AL2	When the engine coolant temperature decreases to setpoint P16 (low water temperature alarm), the GSC issues a low water temperature alarm.	Engine coolant temperature reaches the setpoint for low water temperature alarm.	Correct the cause and reset the system.	Caterpillar EMCP II
AL3	The GSC issues a low oil pressure alarm when the engine oil pressure drops to within 34 kPa (5 psi) of the P13 setpoint or the P14 setpoint.	Engine oil pressure reaches the setpoint for low oil pressure shutdown.	Correct the cause and reset the system.	Caterpillar EMCP II
Diagnostic Flash Code	The “DIAGNOSTIC” lamp flashes in order to indicate a two-digit code.			Caterpillar 3126B
Diagnostic Lamp flashes a fault code	General engine fault		Refer to the Messenger display for any additional information that may be available.	Caterpillar SEBU7772-02
E0190	An overspeed condition is detected by the Electronic Control Module (ECM). The event code E0190 will be logged if the engine speed exceeds 3300 rpm.			Caterpillar C4.4 Industrial Engine, Caterpillar SEBU8180-01
LOW BATTERY CHARGING SYS VOLT WARN	“LOW BATTERY CHARGING SYS VOLT WARN” or “LOW BATTERY VOLTAGE WARNING? will be displayed on the EMCP 3.	The measured battery voltage value goes above or below the programmed thresholds for a configurable duration.		Caterpillar CNB1-Up
Not specified in text	The red fault shutdown indicator (25) FLASHES when the GSC+ detects a shutdown fault.			Caterpillar DWB1-Up (Generator Set), Caterpillar SXC1-Up
Ow	SHORT LOW
SMCS Code: 4490	Data Link Circuit Fault			Caterpillar CNB1-Up
SP1	When a fault occurs in a spare input programmed as an alarm fault, the GSC waits for the end of the time delay. The fault alarm indicator flashes.	A spare input is active and programmed as an alarm fault.	Correct the cause and reset the system.	Caterpillar EMCP II
SP2	When a fault occurs in a spare input programmed as a shutdown fault, the GSC waits for the end of the time delay. The fault shutdown indicator flashes.	A spare input is active and programmed as a shutdown fault.	Correct the cause and reset the system.	Caterpillar EMCP II
SP3	When a fault occurs in a spare input programmed as a shutdown fault, the GSC waits for the end of the time delay. The corresponding fault code SP1, SP2 or SP3 is immediately shown on the upper display.	A spare input is active and programmed as a shutdown fault.	Correct the cause and reset the system.	Caterpillar EMCP II
active fault code	Electronic problem detected			Caterpillar 3054C (ATAAC), Caterpillar 3054C (T), Caterpillar 3056E (ATAAC)
g00604607	The fault alarm indicator (3) flashes when the GSC detects an alarm fault.			Caterpillar SR4B
g00634142	The yellow fault alarm indicator (26) FLASHES when the GSC+ detects an alarm fault.			Caterpillar DWB1-Up (Generator Set), Caterpillar SXC1-Up
i00932023	E spare data output is deactivated			Caterpillar EMCP II
i01190421	Low power or poor performance in the winter		Before troubleshooting for low power or for poor performance in the winter, check the type of fuel that is being used. When No. 2 diesel fuel is used the following components provide a means of minimizing problems in cold weather: • Starting aids • Engine oil pan heaters • Engine coolant heaters • Fuel heaters • Fuel line insulation	Caterpillar 3406C Industrial Engine
i01197515	SMCS Code: 1000		• Check the crankcase oil level. Maintain the oil level between the “ADD” mark and the “FULL” mark on the oil level gauge. • If necessary, perform minor adjustments. Repair any leaks and tighten any loose bolts. • Note the service hour meter reading. Perform the maintenance that is in the Operation and Maintenance Manual, “Maintenance Interval Schedule”.	Caterpillar 3406C Industrial Engine
i01226491	Engine overspeed		Stop the engine by shutting off the fuel supply to the engine and/or shutting off the air supply to the engine.	Caterpillar 3306B, Caterpillar 3406, Caterpillar 3406E, Caterpillar 3412C, Caterpillar 3412C Generator Set, Caterpillar 3500 Series
i01324368	An intermittent failure in the TPS causes the engine speed to vary erratically.			Caterpillar 3126B
i01324374	Engine Operation with Active Diagnostic Codes		If the diagnostic lamp starts to flash codes during normal engine operation, the system has identified a situation that is not within the specification. Use Caterpillar electronic service tools to check the active diagnostic codes.	Caterpillar 3126B
i01456915	Engine Operation with Intermittent Diagnostic Codes		If the diagnostic lamp starts to flash codes during normal engine operation and the diagnostic lamp shuts off, an intermittent fault may have occurred. If a fault has occurred, the fault will be logged into the memory of the Electronic Control Module (ECM).	Caterpillar 3126B
i01462046	Engine Stopping		Stop the engine according to the procedure in the Operation and Maintenance Manual, “Engine Stopping (Operation Section)” in order to avoid overheating of the engine and accelerated wear of the engine components. Use the Emergency Stop Button (if equipped) ONLY in an emergency situation. Do not use the Emergency Stop Button for normal engine stopping. After an emergency stop, DO NOT start the engine until the problem that caused the emergency stop has been corrected.	Caterpillar 3126B
i01463504	Fault Logging		The system provides the capability of Fault Logging. When the Electronic Control Module (ECM) generates an active diagnostic code, the code will be logged in the memory of the ECM.	Caterpillar 3126B
i02710753	Engine may not start properly due to severely discharged battery.		After jump starting, the alternator may not be able to fully recharge batteries that are severely discharged. The batteries must be replaced or charged to the proper voltage with a battery charger after the engine is stopped.	Caterpillar SEBU8327
i02897975	An alarm fault is occurring.	An alarm fault is not critical but an alarm fault is potentially serious. An alarm fault can be protective relaying functions that have been enabled as an alarm fault.		Caterpillar SXC1-Up
logged fault	Problem has occurred, but is not presently active			Caterpillar 3054C (ATAAC), Caterpillar 3054C (T), Caterpillar 3056E (ATAAC)
null	Increased coolant temperature			Caterpillar 3408C, Caterpillar 3412, Caterpillar 3412C

Compiled from Caterpillar service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.

Common questions

What does Caterpillar fault code 03 mean?

An active 0-3 diagnostic code is present.. Remedy: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes..

What does Caterpillar fault code 04 mean?

An active 0-4 diagnostic code is present.. Remedy: Check the Analog Supply Voltage at the Sensor Connectors and then Check the Analog Supply Voltage at the ECM. If the supply voltage is not correct, replace the ECM..

What does Caterpillar fault code 04 (Short to Ground) mean?

There is a short circuit diagnostic code for the suspect sensor.. Remedy: Use a suitable piece of wire to short terminal B (Analog Return) and terminal C (Signal) at the harness side of the suspect sensor connector. Check for active diagnostic codes on Cat ET..

What does Caterpillar fault code 100 1 mean?

Low Engine Oil Pressure. Remedy: LOW ENGINE Data Link circuit Fault.

What does Caterpillar fault code 107 0 mean?

High Air Filter Differential. Remedy: HIGH AIR FILTER | Digital Input Circuit.

What does Caterpillar fault code 107 1 mean?

Low Air Filter Differential. Remedy: LOW AIR FILTER | Digital Input Circuit.