Turbocharger Boost Control Position Sensor B Circuit
General electrical fault on the turbocharger boost control position sensor B — second position sensor on the same actuator (redundant Hall) or on a second turbo (twin-turbo, sequential or two-stage). With B invalid the ECM cannot cross-check actuator A and falls back to limited boost control.
Affected components
- Turbo actuator position sensor b
- Sensor wiring
Common causes
- High likelihood: Open or shorted wiring to the position sensor
- Medium likelihood: Failed Hall element
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.