Powertrain
Definition only
Lights the check engine lamp
P26AA: Engine Coolant Bypass Valve A Position Sensor Maximum Stop Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26AA mean?
During self-calibration the bypass valve A position sensor never reached the maximum mechanical stop.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Sediment prevents valve from reaching maximum 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 P26AA on the same make and model first.
P26AA in the community
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