OBD-II code · Powertrain (generic, extended)
P23C5 Engine Coolant Bypass Valve C Position Sensor Circuit High
Same as P23C3 with the signal voltage above 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 P23C5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal 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
- 0.8–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Bypass Valve C Position Sensor
Related codes
- P26A7Engine Coolant Bypass Valve A Position Sensor Circuit High
- P2AAAEngine Coolant Bypass Valve B Position Sensor Circuit High
- P23C2NOx Sensor Delayed Response High to Low Bank 1 Sensor 3
- P23C3Engine Coolant Bypass Valve C Position Sensor Circuit
- P23C4Engine Coolant Bypass Valve C Position Sensor Circuit Low
- P23C6Engine Coolant Bypass Valve C Control Circuit Driver Current or Temperature Too High
- P23C7Fuel Heater Control Module Power Control Circuit Open
- P23C8Fuel Heater Control Module Power Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.