Fuel Heater Control Module Feedback Signal Performance

Where it lives

For P23CE, the part to look at first is the module named here.

Check these first

• Feedback voltage outside its expected range
• A failing fuel heater control module
• High resistance in the feedback wiring
• A weak module ground causing a drifting signal

What to do next

1. Read the fuel heater feedback value on a scan tool
2. Compare feedback voltage to the commanded heater state
3. Measure resistance of the feedback wire
4. Check the module ground for high resistance
5. Replace the fuel heater control module if the circuit checks good
6. Clear the code and retest

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