2623
What This Code Means
Problem 37; Problem 38; Problem 39; Problem 36; Over current cylinder 9 for one second; Over current cylinder 10 for one second; Under current cylinder 1 for one minute; Under current cylinder 2 for one minute; Under current cylinder 3 for one minute; Under current cylinder 4 for one minute; Under current cylinder 5 for one minute; Under current cylinder 6 for one minute; Under current cylinder 7 for one minute; Under current cylinder 8 for one minute; Under current cylinder 9 for one minute; Under current cylinder 10 for one minute; Internal ignition: no cam pulses detected after cranking for four seconds on gaseous unit; External ignition: no cam pulses detected; Internal ignition: missing crank pulses detected; External ignition: missing crank pulses detected; CANbus error reported by external ignition; CANbus error reported by Diesel ECU; Fuel level below 10% for greater than 60 seconds; Low coolant detected for greater than five seconds; Battery voltage level < 9.0 for 60 seconds
Possible Causes
- •Over current cylinder9 Coil current too high for one second.
- •Over current cylinder10 Coil current too high for one second.
- •Under current cylinder1 Coil current too low for one minute.
- •Under current cylinder2 Coil current too low for one minute.
- •Under current cylinder3 Coil current too low for one minute.
- •Under current cylinder4 Coil current too low for one minute.
- •Under current cylinder5 Coil current too low for one minute.
- •Under current cylinder6 Coil current too low for one minute.
- •Under current cylinder7 Coil current too low for one minute.
- •Under current cylinder8 Coil current too low for one minute.
- •Under current cylinder9 Coil current too low for one minute.
- •Under current cylinder10 Coil current too low for one minute.
- •Internal Ignition Missing Cam Cranked for four seconds on gaseous unit, no cam pulses detected.
- •External Ignition Missing Cam No cam pulses detected by external ignition.
- •Internal Ignition Missing Crank Pulses Missing crank pulses detected by internal ignition.
- •External Ignition Missing Crank Pulses Missing crank pulses detected by external ignition.
- •CAN Bus CANbus error reported by external ignition.
- •CAN Bus CANbus error reported by Diesel ECU.
- •Coil current too high for one second
- •Coil current too low for one minute
Suggested Actions
- 1Problem 37
- 2Problem 38
- 3Problem 39
- 4Problem 36
- 5Problem 26
- 6The system detected battery voltage level < 9.0 for 60 seconds and has triggered the alarm.
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 2623 on your specific Generac unit — cited to the OEM manual, not a forum guess.
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