Cummins Onan error code 81 (EGT Sensor Open)
Exhaust Gas Temperature sensor stuck open (open circuit). Authorized dealer service required.
What to check, and in what order, is in the app. The flow Read Fault Code (Entry Point) walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
Start free trial 14 days free, no card neededDocumented in
- Cummins/Onan RV Generator Set Operator Manual 0983-0101 (Issue 6), Fault Codes / Table 5