OBD II Fault Code

  • OBD II P050B

    OBD-II Code Decreased engine performance is defined as a Cold Start Ignition Timing Performance

    The engine's control module (PCM) does everything possible to help the catalytic converter warm up as quickly as possible in an effort to reduce emissions. Part of the control module's logic in the this process is to increase the amount of air flowing through the engine on startup and adjust the engine's timing accordingly. If the engine speed does not match the PCM's RPM request, the PCM will store code P050B.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P050B Code

    • Clogged air filter
    • Idle Air Control (IAC) valve failure
    • Mass Air Flow (MAF) sensor failure
    • Powertrain Control Module (PCM) failure
    • Throttle body assembly failure
    • Wiring issue

    Common Repairs Needed for the P050B Code

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