Onan Generator: “Fault 19”
warning RV generator fault codes
What it means
Governor actuator fault. The controller detected an open or shorted circuit in the electronic governor actuator that regulates engine speed.
Most likely causes
- Open or short in the governor actuator or its wiring most likely
- Failed governor actuator common
Safe checks you can do yourself
- Visually inspect for obvious damaged or disconnected wiring near the governor actuator (with the generator off and battery negative disconnected).
- Note the code and how often it recurs to help the technician.
How to reset / clear Fault 19
- This is a dealer-service fault; no owner reset clears the underlying cause.
When to call a technician
Whenever Code 19 appears — the manufacturer directs this to an authorized Onan dealer.
Applies to
Marquis Gold · QG 4000 · QG 5500 · KY series · HGJAA · HGJAB · HGJAC · HGJAD · HGJAE · HGJAF
FAQ
What does Onan Generator code "Fault 19" mean?
Governor actuator fault. The controller detected an open or shorted circuit in the electronic governor actuator that regulates engine speed.
How do I reset Onan Generator Fault 19?
This is a dealer-service fault; no owner reset clears the underlying cause.
What is the most common cause of Fault 19 on a Onan Generator?
The most likely cause is open or short in the governor actuator or its wiring.
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Sources
- Onan Troubleshooting Codes (Service Manual Table 5) — Governor Actuator Fault — Code No. 19 (Cummins Onan (hosted by Heartland Owners))
Note: Do not confuse with Code 22 (Governor Actuator Overload), which is load-related and owner-addressable.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.