Code result
P26A9
Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Sediment prevents valve from reaching minimum stop
highOne of the most commonly reported causes for this code — check this first.
Sensor not aligned with valve shaft
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P26A9 freeNo credit card required