OBD-II code · Powertrain (generic, extended)
P26BB Engine Coolant Bypass Valve C Range/Performance
The third coolant bypass valve responds to commands but the resulting coolant temperature behaviour is not as expected.
Is it safe to drive with P26BB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyValve partially stuck by sediment
- PossibleWeak return spring fails to close fully
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Bypass Valve C, Thermostat Housing
Related codes
- P26A3Engine Coolant Bypass Valve A Range/Performance
- P26B0Engine Coolant Bypass Valve B Range/Performance
- P26C1Engine Coolant Bypass Valve D Range/Performance
- P2E66Engine Coolant Bypass Valve E Range/Performance
- P26B8Engine Coolant Bypass Valve C Control Circuit Low
- P26B9Engine Coolant Bypass Valve C Control Circuit High
- P26BAEngine Coolant Bypass Valve C Stuck/Open
- P26BCEngine Coolant Bypass Valve C Stuck Closed
- P26BDEngine Coolant Bypass Valve D Control Circuit / Open
- P26BEEngine Coolant Bypass Valve D Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.