Turbocharger/Supercharger Boost Control "B" Circuit/Open
This code means the PCM/ECM has detected an open circuit affecting turbocharger/supercharger boost control "b. On turbocharged or supercharged engines, this can upset airflow and boost control, causing low power, poor acceleration, smoke, or limp mode.
What You Might Notice
- Check Engine Light illuminated
- Reduced boost or low power
- Poor acceleration
- Engine may enter limp mode
- Possible smoke under load
Most Common Causes
- 1
Open circuit in the affected wiring or component
- 2
Faulty boost control solenoid, sensor, or actuator
- 3
Damaged wiring/connectors
- 4
Sticking wastegate or turbo/supercharger issue
- 5
PCM control fault
How to Diagnose It
- 1
Check Open circuit in the affected wiring or component — Inspect for signs of failure and test before replacing.
- 2
Check Faulty boost control solenoid, sensor, or actuator — Inspect for signs of failure and test before replacing.
- 3
Check Damaged wiring/connectors — Inspect for signs of failure and test before replacing.
- 4
Check Sticking wastegate or turbo/supercharger issue — Inspect for signs of failure and test before replacing.
- 5
Check PCM control fault — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Pressure-test the intake/boost system for leaks
- 2
Inspect and repair wiring/connectors to the control solenoid or sensor
- 3
Test and replace the faulty boost-related component
- 4
Inspect the turbo/supercharger and wastegate for sticking or damage
- 5
Clear the code and confirm boost control during a road test
Need a deeper diagnosis?
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