Turbocharger Boost Control Position Sensor A Performance - Stuck High
Position sensor A reports a value stuck near the high end of its travel — actuator stuck open (wastegate held wide open, VGT vanes seized at maximum opening) or sensor pegged high. Boost suffers — typically underboost on VGT, overboost-protection-off on wastegate.
Affected components
- Turbo actuator position sensor a
- Turbo actuator
Common causes
- High likelihood: Actuator mechanically stuck near high end
Possible symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.