42 Ford generator fault/alarm codes with symptom, cause and remedy — compiled from Ford service and controller documentation.
| Code | Meaning / symptom | Cause | Remedy |
|---|---|---|---|
| 12 | THROTTLE POSITION LOW | ||
| 14 | MANIFOLD ABSOLUTE PRESSURE LOW | ||
| 21 | Overspeed Protection | ||
| 22 | THROTTLE POSITION HIGH | ||
| 24 | MANIFOLD ABSOLUTE PRESSURE HIGH | ||
| 31 | FUEL PUMP VOLTAGE LOW | ||
| 32 | HEATED OXYGEN SENSOR VOLTAGE LOW | ||
| 33 | COOLANT TEMPERATURE EXCEEDED 255°F | ||
| 42 | HEATED OXYGEN SENSOR VOLTAGE HIGH | ||
| 483 | COOLANT TEMPERATURE LESS THAN -50°F | ||
| 61 | IGNITION VOLTAGE LOW | ||
| 62 | IGNITION VOLTAGE HIGH | ||
| DTC 12 | Throttle Position (TP) Sensor Low Voltage | ||
| DTC 14 | Manifold Absolute Pressure (MAP) Sensor Low Voltage | ||
| DTC 21 | Overspeed | ||
| DTC 22 | Throttle Position (TP) Sensor | ||
| DTC 23 | Over Maximum Drive-By-Wire | ||
| DTC 24 | Manifold Absolute Pressure (MAP) Sensor High Voltage | ||
| DTC 31 | Fuel Pump Low Voltage | ||
| DTC 32 | HO2S Sensor Low Voltage | ||
| DTC 33 | Engine Coolant Temperature | ||
| DTC 41 | Fuel Pump High Voltage | ||
| DTC 42 | HO2S Sensor High Voltage | ||
| DTC 43 | Engine Coolant Temperature | ||
| DTC 51 | Low Oil Pressure | ||
| DTC 52 | Crankshaft Position Sensor Intermittent Malfunction | ||
| DTC 53 | Camshaft Position Sensor Intermittent Malfunction | ||
| DTC 54 | ECM Fault Legal Operation | ||
| DTC 55 | ECM Fault Legal Interruption | ||
| DTC 56 | ECM Fault Computer Operating Properly (COP) Failure | ||
| DTC 61 | System Voltage Low | ||
| DTC 62 | System Voltage High | ||
| E3 | Evaporative Emissions System Leak | ||
| FAULT 1 or FAULT 2 | Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run. | ||
| FuelSys006 | Fuel System Fault | ||
| HI ENG TEMP | HI ENG TEMP lamp lights. Engine shuts down. | Indicates engine has overheated (engine temperature has risen above 215° F/102° C) or coolant level is low (sets with coolant level sensor). Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if loose. d. Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above. | |
| LO FUEL | LO FUEL lamp lights. Engine continues to run. | Indicates gasoline fuel supply is running low. Check fuel supply and replenish as required. | |
| LO FUEL LAMP | LO FUEL LAMP lights. Engine shuts down and LO OIL PRES lamp lights. | Indicates engine has run out of fuel. Check fuel level and replenish as required. | |
| LO OIL PRES | LO OIL PRES lamp lights. Engine shuts down. | Indicates engine oil pressure has dropped to 25 psi (172 kPa). Check oil level and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Contact an authorized service center if oil pressure is not in the range of 40 to 65psi (275 to 448 kPa). | |
| LOW FUEL | Engine continues to run or is in standby mode. | Indicates fuel supply pressure is marginally low (5 inches [127 mm] WC or less). Check for partially closed shutoff valve, empty propane supply tank. For natural gas fueled sets, check with the gas utility. | |
| PRE HI ENGINE TEMP | PRE HI ENGINE TEMP lamp lights. Engine continues to operate. | Indicates engine has begun to overheat and engine temperature has risen to approximately 205° F (97° C). If generator is powering non-critical and critical loads and cannot be shut down, use the following: a. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. If engine can be stopped, follow procedure in step 3. | |
| PRE LO OIL PRES | PRE LO OIL PRES lamp lights. Engine continues to operate. | Indicates engine oil pressure has dropped to 30 psi (207 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedures in step 5. |
Compiled from Ford service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.