Cummins/Onan GGKD troubleshooting: 19 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan GGKD — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Remedy |
|---|---|---|
| 213 | Warning lamp lights. | Indicates that the resistance of the coolant temperature sender is out of range. Contact an authorized service center. |
| 214, 215 | Shutdown or Warning lamp lights. | Indicates engine coolant level has fallen below the trip point. Allow engine to cool down completely before proceeding. a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Reset control and restart after locating and correcting problem. Contact an authorized service center. |
| 220 | Shutdown lamp lights. | Indicates mag pickup speed indication is not being sensed or does not match generator set output frequency. a. Restart and check RPM on the digital display. b. Contact an authorized service center. |
| 221 | Engine will not crank. | Indicates possible fault with control or starting system. Check for the following conditions: a. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. b. Discharged or defective battery. Recharge or replace the battery. c. Contact an authorized service center for service of starter and starting system. |
| 223 | Engine runs and then shuts down, Shutdown lamp lights. | Indicates engine has exceeded normal operating speed. (2070 rpm @ 60 Hz; 1800 rpm @ 50 Hz) Contact an authorized service center. |
| 101 | Engine continues to operate at reduced RPM. | Indicates that the engine is operating in idle mode. When the set is operating in the RUN mode, grounding the engine idle input causes generator build-up to be inhibited and the engine to be governed at 800 RPM. When ground is removed from this input, the set returns to normal speed and voltage. When the engine idle function is enabled, the control automatically sets lower oil pressure warning and shutdown trip points to reflect the lower operating speed. When the engine idle function is removed and the set reverts to normal operating speed, the control automatically resets oil pressure warning and shutdown trip points to the normal settings. |
| 102 | Engine shuts down and will not crank. | Indicates local or remote Emergency Stop. To reset the local Emergency Stop button: Pull the button out or turn the switch clockwise (button with arrow). Move the Run/Off/Auto switch to Off. Press the Reset switch. Select Run or Auto, as required. |
| 301 | Shutdown lamp lights. MESSAGE: HIGH AC VOLTAGE | Contact an authorized service center. |
| 303 | Shutdown lamp lights. MESSAGE: LOW AC VOLTAGE | Contact an authorized service center. |
| 313 | Shutdown lamp lights. MESSAGE: UNDER FREQUENCY | Contact an authorized service center. |
| 320 | Warning lamp lights. MESSAGE: OVERCURRENT | Contact an authorized service center. |
| 321 | Shutdown lamp lights. MESSAGE: OVERCURRENT | Contact an authorized service center. |
| 322 | Shutdown lamp lights. MESSAGE: SHORT CIRCUIT | Contact an authorized service center. |
| 330 | Warning lamp lights. MESSAGE: OVERLOAD | Contact an authorized service center. |
| 335 | Shutdown lamp lights. MESSAGE: REVERSE POWER | Contact an authorized service center. |
| Symptom | Cause | Remedy |
|---|---|---|
| Control does not power up when the Run/Off/Auto switch is set to Run or the Self Test switch is pressed. | There is no DC power to the control. Check for battery disconnected, discharged, or improperly connected. | Contact an authorized service center. |
| Non-Automatic lamp flashes. | Indicates Run/Off/Auto switch is not in the Auto position. This will prevent automatic starting if an automatic transfer switch is used. Move the Run/Off/Auto switch to the Auto position for automatic operation. | |
| Engine starts from generator control panel but will not start automatically or from a remote panel. | Check the control wiring between the remote switch and the PCC. | Contact an authorized service center. |
| No AC output voltage. | Contact an authorized service center. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: There is no DC power to the control. Check for battery disconnected, discharged, or improperly connected.. See the table for the matching fixes.
Documented causes: Check the control wiring between the remote switch and the PCC.. See the table for the matching fixes.