What causes P1155 on a Ford?

Failed alternative fuel controller module Open controller power or ground Faulty fuel selector components Wiring fault between controller and PCM Corrupted controller calibration

How do I fix P1155 on a Ford?

Verify controller power and ground Check selector switch operation Inspect the controller harness Test on gasoline mode to isolate the alt-fuel side Replace or reflash the controller per diagnostics

P1155 Alternative Fuel Controller Fault

Q: What does P1155 mean on a Ford?

P1155 — Alternative Fuel Controller Fault. Applies to Bi-fuel CNG/propane Ford trucks and vans.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Bi-fuel CNG/propane Ford trucks and vans

What does P1155 mean on a Ford?

P1155 — Alternative Fuel Controller Fault. This Ford-enhanced code applies to Bi-fuel CNG/propane Ford trucks and vans.

Common causes of P1155

Failed alternative fuel controller module
Open controller power or ground
Faulty fuel selector components
Wiring fault between controller and PCM
Corrupted controller calibration

How to fix P1155

Verify controller power and ground
Check selector switch operation
Inspect the controller harness
Test on gasoline mode to isolate the alt-fuel side
Replace or reflash the controller per diagnostics