OBD-II code · Powertrain (generic, extended)
P23C7 Fuel Heater Control Module Power Control Circuit Open
The control line that energises the fuel heater control module - used on diesel systems for cold-weather fuel preheating - is open.
Is it safe to drive with P23C7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in control 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
- Usually unaffected
- Parts involved
- Fuel Heater Control Module
Related codes
- P23C4Engine Coolant Bypass Valve C Position Sensor Circuit Low
- P23C5Engine Coolant Bypass Valve C Position Sensor Circuit High
- P23C6Engine Coolant Bypass Valve C Control Circuit Driver Current or Temperature Too High
- P23C8Fuel Heater Control Module Power Control Circuit Low
- P23C9Fuel Heater Control Module Power Control Circuit High
- P23CAFuel Rail Heater Control Circuit Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.