OBD-II code · Powertrain (generic, extended)
P26BA Engine Coolant Bypass Valve C Stuck/Open
The third coolant bypass valve is stuck open.
Is it safe to drive with P26BA?
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 C, Thermostat Housing
Related codes
- P26ABEngine Coolant Bypass Valve A Stuck/Open
- P26AFEngine Coolant Bypass Valve B Stuck/Open
- P26C0Engine Coolant Bypass Valve D Stuck/Open
- P2E65Engine Coolant Bypass Valve E Stuck/Open
- P26B7Engine Coolant Bypass Valve C Control Circuit / Open
- P26B8Engine Coolant Bypass Valve C Control Circuit Low
- P26B9Engine Coolant Bypass Valve C Control Circuit High
- P26BBEngine Coolant Bypass Valve C Range/Performance
- P26BCEngine Coolant Bypass Valve C Stuck Closed
- P26BDEngine Coolant Bypass Valve D Control Circuit / Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.