OBD-II code · Powertrain (generic, extended)
P26A9 Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance
During self-calibration the bypass valve A position sensor never reached the minimum mechanical stop. The position reference cannot be zeroed.
Is it safe to drive with P26A9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySediment prevents valve from reaching minimum stop
- PossibleSensor not aligned with valve shaft
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 A, Position Sensor
Related codes
- 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
- P26AAEngine Coolant Bypass Valve A Position Sensor Maximum Stop Performance
- P26ABEngine Coolant Bypass Valve A Stuck/Open
- P26ACEngine Coolant Bypass Valve B Control Circuit / Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.