OBD-II code · Powertrain (generic, extended)
P26A7 Engine Coolant Bypass Valve A Position Sensor Circuit High
The bypass valve A position sensor signal is above the upper diagnostic threshold. 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.
Is it safe to drive with P26A7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen sensor element
- PossibleSignal wire shorted to the 5 V reference
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Bypass Position Sensor A, Wiring Harness
Related codes
- P23C5Engine Coolant Bypass Valve C Position Sensor Circuit High
- P2AAAEngine Coolant Bypass Valve B Position Sensor Circuit High
- P26A4Engine Coolant Bypass Valve A Position Sensor Circuit
- P26A5Engine Coolant Bypass Valve A Position Sensor Circuit Range/Performance
- P26A6Engine Coolant Bypass Valve A Position Sensor Circuit Low
- P26A8Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic
- P26A9Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance
- P26AAEngine Coolant Bypass Valve A Position Sensor Maximum Stop Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.