P1156 Fuel Selector Switch Circuit Fault
What does P1156 mean on a Ford?
P1156 — Fuel Selector Switch Circuit Fault. This Ford-enhanced code applies to Bi-fuel CNG/propane Ford trucks and vans.
Common causes of P1156
- Failed fuel selector switch
- Open or shorted switch circuit
- Corroded switch connector
- Faulty selector indicator
- Controller input fault
How to fix P1156
- Test switch continuity in each position
- Inspect the switch connector
- Check circuit wiring to the controller
- Verify the indicator matches actual fuel mode
- Replace the switch if the circuit is sound