OBD-II code · Powertrain (generic, extended)
P26C0 Engine Coolant Bypass Valve D Stuck/Open
The fourth coolant bypass valve is stuck open.
Is it safe to drive with P26C0?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve seized open by sediment
- PossibleBroken return spring
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Bypass Valve D, Thermostat Housing
Related codes
- P26ABEngine Coolant Bypass Valve A Stuck/Open
- P26AFEngine Coolant Bypass Valve B Stuck/Open
- P26BAEngine Coolant Bypass Valve C Stuck/Open
- P2E65Engine Coolant Bypass Valve E Stuck/Open
- P26BDEngine Coolant Bypass Valve D Control Circuit / Open
- P26BEEngine Coolant Bypass Valve D Control Circuit Low
- P26BFEngine Coolant Bypass Valve D Control Circuit High
- P26C1Engine Coolant Bypass Valve D Range/Performance
- P26C2Engine Coolant Bypass Valve D Stuck Closed
- P26C3Internal Control Module Transmission Range Sensor Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.