Fuel Heater Control Module Feedback Signal/Open

Where it lives

For P23CD, the description names the module as the part involved.

Check these first

• An open in the heater control module feedback wire
• A failed fuel heater control module
• A missing or weak module ground
• A backed out pin at the feedback connector

What to do next

1. Read the fuel heater feedback voltage on a scan tool
2. Check continuity of the feedback wire from module to PCM
3. Verify the heater control module ground
4. Inspect the feedback connector pins for a backed out terminal
5. Replace the fuel heater control module if the feedback wire and ground are good
6. Clear the code and retest

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