OBD-II code · Powertrain (generic, extended)
P26A5 Engine Coolant Bypass Valve A Position Sensor Circuit Range/Performance
The bypass valve A position sensor reading does not correlate with commanded position. Sensor drift or worn linkage.
Is it safe to drive with P26A5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleSensor signal drift after thermal aging
- PossibleWorn linkage between actuator and valve
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Bypass Position Sensor A, Actuator Linkage
Related codes
- P26A2Exhaust Aftertreatment Glow Plug Circuit High
- P26A3Engine Coolant Bypass Valve A Range/Performance
- P26A4Engine Coolant Bypass Valve A Position Sensor Circuit
- P26A6Engine Coolant Bypass Valve A Position Sensor Circuit Low
- P26A7Engine Coolant Bypass Valve A Position Sensor Circuit High
- P26A8Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.