Powertrain
Definition only
Lights the check engine lamp
P26A9: Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26A9 mean?
During self-calibration the bypass valve A position sensor never reached the minimum mechanical stop. The position reference cannot be zeroed.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Sediment prevents valve from reaching minimum stop
- Medium Sensor not aligned with valve shaft
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P26A9 on the same make and model first.
P26A9 in the community
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