Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance
During self-calibration of the exhaust heat exchanger bypass valve A, the position sensor never reached the expected mechanical stop. The controller cannot zero the position reference, so commanded openings will be inaccurate.
Affected components
- Exhaust heat exchanger
- Bypass valve actuator
- Position sensor
Common causes
- High likelihood: Soot or carbon deposits prevent valve from reaching the stop
- Medium likelihood: Worn linkage between actuator and valve flap
- Medium likelihood: Position sensor not aligned with valve shaft
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.