OBD-II code · Powertrain (generic, extended)
P23CF Fuel Heater Control Module Feedback Signal Circuit Low
Same as P23CD with the feedback voltage below the plausible range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P23CF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFeedback line shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Heater Control Module
Related codes
- P23CCFuel Rail Heater Control Circuit High
- P23CDFuel Heater Control Module Feedback Signal Open
- P23CEFuel Heater Control Module Feedback Signal Performance
- P23D0Fuel Heater Control Module Feedback Signal Circuit High
- P23D1Cylinder 1 Fuel Heater Control Circuit Open
- P23D2Cylinder 1 Fuel Heater Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.