General Motors GM Gasous Engine

• WEAK BATTERY — Warning 221
  Cause: Indicates that the genset battery voltage is below battery thresholds during cranking.
• WEAK BATTERY — Lamp: Warning; Indicates that during cranking, the battery voltage is at or below the weak battery warning trip point for a time greater than or equal to the weak battery set time 221
  Cause: Battery voltage at or below the weak battery warning trip point during cranking
  Fix: See code 213 for corrective action
• VOLTAGE BIAS OOR — Shutdown 102
  Cause: Indicates the voltage bias circuit output is out of range (OOR), high or low. (I/O Module option.)
• UNDER FREQUENCY — Shutdown 15
  Cause: Indicates that the alternator frequency is 6 hertz under the governor reference.
• UNDER FREQUENCY — Lamp: Shutdown; Indicates possible fuel system problem or overload condition 15
  Cause: Possible fuel system problem or overload condition; dirty or plugged air filter; inadequate gaseous fuel delivery
  Fix: Check for dirty or plugged air filter and replace if necessary (see Maintenance sections); Check operation by disconnecting load and restarting generator set; Adjust fuel system (refer to Section 7); Gaseous fuel delivery to the set is inadequate. Contact an authorized service center for service; Reset the control and restart after correcting the problem
• SPEED SIGNAL LOST — Shutdown 45
  Cause: Indicates that no magnetic pickup pulses were sensed for a Loss of Speed delay. If a magnetic pickup is not installed, then speed sensing is performed by monitoring AC line frequency.
• SPEED HZ MATCH — Shutdown 71
  Cause: Indicates that measured engine speed and measured alternator AC output frequency do not agree.
• SPEED BIAS OOR — Shutdown 103
  Cause: Indicates the speed bias circuit output is out of range (OOR), high or low. (I/O Module option.)
• Service Engine (begin spec B) — Warning 205
  Cause: Indicates that emissions criteria might not be met due to one of the following: Engine running in open loop; Lean mixture; Rich mixture; Failed fuel system component
• REMOTE E-STOP — Lamp: Shutdown; Indicates remote Emergency Stop activation 61
  Fix: Deactivate (disable) remote emergency stop button; Move the rocker switch to the OFF position or press the OFF button; Select the desired operating mode (manual or remote)
• PRE-LOW OIL PRESSURE — Warning 215
  Cause: Indicates that the engine oil pressure is approaching an unacceptable level.
• PRE-LOW OIL PRES — Lamp: Warning; Indicates engine oil pressure has dropped to an unacceptable level 215
  Cause: Engine oil pressure has dropped to an unacceptable level
  Fix: If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow fault code 2 procedure
• PRE-HIGH COOLANT TEMP — Warning 202
  Cause: Indicates engine is operating near cooling system capacity. Increase in load or higher ambient temperature may cause High Coolant Temp (code 1) shutdown.
• PRE-HIGH COOL TMP — Lamp: Warning; Indicates engine is operating near cooling system capacity 202
  Cause: Increase in load or higher ambient temperature may cause High Coolant Temp (1) shutdown; other possible causes per fault code 1 correction list
  Fix: Review fault code 1 correction list for other possible causes
• OVERSPEED — Shutdown 31
  Cause: Indicates that the engine has exceeded normal operating speed. The default thresholds are 1725 RPM (50 Hz) or 2075 RPM (60 Hz).

Compiled from service & troubleshooting documentation across every generator set that uses the General Motors GM Gasous.