OBD-II code · Powertrain (generic, extended)
P26AC Engine Coolant Bypass Valve B Control Circuit / Open
The controller cannot drive the second coolant bypass valve. The associated cooling sub-loop cannot be regulated.
Is it safe to drive with P26AC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen coil in bypass valve solenoid
- PossibleBroken control wire
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, Solenoid, Wiring Harness
Related codes
- P2681Engine Coolant Bypass Valve A Control Circuit / Open
- P26B7Engine Coolant Bypass Valve C Control Circuit / Open
- P26BDEngine Coolant Bypass Valve D Control Circuit / Open
- P26A9Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance
- P26AAEngine Coolant Bypass Valve A Position Sensor Maximum Stop Performance
- P26ABEngine Coolant Bypass Valve A Stuck/Open
- P26ADEngine Coolant Bypass Valve B Control Circuit Low
- P26AEEngine Coolant Bypass Valve B Control Circuit High
- P26AFEngine Coolant Bypass Valve B Stuck/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.