Code Definition

P1155 — Alternative Fuel COntrol Module has activated MIL lamp

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1155

P1155 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1155 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code applies to Ford vehicles equipped with an alternative fuel system such as compressed natural gas, liquefied petroleum gas, or a bi fuel arrangement, which use a dedicated Alternative Fuel Control Module to manage the alternative fuel supply and its emissions. DTC P1155 sets when that Alternative Fuel Control Module has detected a fault within its own system and has commanded the Powertrain Control Module to illuminate the malfunction indicator lamp. The code is therefore a flag that the fault detail sits in the alternative fuel controller rather than in the base engine management. De...

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