OBD II Fault Code

  • OBD II P004B

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Turbocharger/Supercharger Boost Control "B" Circuit

The engine control module (PCM) uses a Boost Control Solenoid to control the turbocharger and provide the requested amount of boost. When the PCM detects an incorrect signal from the Boost Control Solenoid, it will set code P004B.

Powertrain Control Module (PCM) failure Symptoms

  • Engine may enter limp home mode (reduced performance)
  • Lack of boost from the turbo/supercharger

Common Problems That Trigger the P004B Code

  • Boost control solenoid failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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