OBD-II code · Powertrain (generic, extended)
P26B0 Engine Coolant Bypass Valve B Range/Performance
The second coolant bypass valve responds to commands but the resulting coolant temperature behaviour is not as expected.
Is it safe to drive with P26B0?
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 B, Thermostat Housing
Related codes
- P26A3Engine Coolant Bypass Valve A Range/Performance
- P26BBEngine Coolant Bypass Valve C Range/Performance
- P26C1Engine Coolant Bypass Valve D Range/Performance
- P2E66Engine Coolant Bypass Valve E Range/Performance
- P26ADEngine Coolant Bypass Valve B Control Circuit Low
- P26AEEngine Coolant Bypass Valve B Control Circuit High
- P26AFEngine Coolant Bypass Valve B Stuck/Open
- P26B1Engine Coolant Bypass Valve A Stuck Closed
- P26B2Engine Coolant Bypass Valve B Stuck Closed
- P26B3Fuel Shutoff Valve A Control Circuit Performance/Stuck Off
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.