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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open coil in bypass valve solenoidCommon
- Broken control wirePossible
Parts involved
- Coolant Bypass Valve B
- Solenoid
- Wiring Harness
P26AC is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.