Powertrain
generic / SAE
P26B8
Engine Coolant Bypass Valve C Control Circuit Low
Voltage on the third coolant bypass valve control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / B8
Possible causes
- Control wire shorted to ground high
- Internal short in solenoid coil medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–800 €
- Estimated time: 0.8–3 h
- Component: coolant bypass valve c
- Component: solenoid
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012