OBD-II code · Powertrain (generic, extended)
P23CA Fuel Rail Heater Control Circuit Open
The fuel rail heater - on common-rail diesels for cold-start - has an open control circuit. The rail cannot be heated, slowing cold-start fuel atomisation.
Is it safe to drive with P23CA?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in heater or wiring
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- P23C7Fuel Heater Control Module Power Control Circuit Open
- P23C8Fuel Heater Control Module Power Control Circuit Low
- P23C9Fuel Heater Control Module Power Control Circuit High
- P23CBFuel Rail Heater Control Circuit Low
- P23CCFuel Rail Heater Control Circuit High
- P23CDFuel Heater Control Module Feedback Signal Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.