OBD-II code · Powertrain (generic, extended)
P23CC Fuel Rail Heater Control Circuit High
Same as P23CA with the control line shorted to supply. The sensor heater warms the element to operating temperature (~600 °C); without it the lambda sensor stays inactive in closed loop and the ECM cannot trim mixture.
Is it safe to drive with P23CC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Rail Heater
Related codes
- P23C9Fuel Heater Control Module Power Control Circuit High
- P23CAFuel Rail Heater Control Circuit Open
- P23CBFuel Rail Heater Control Circuit Low
- P23CDFuel Heater Control Module Feedback Signal Open
- P23CEFuel Heater Control Module Feedback Signal Performance
- P23CFFuel Heater Control Module Feedback Signal Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.