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Our automotive experts have put together the following information about the P0609 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0609 code.

OBD II Fault Code

  • OBD II P0609

    OBD-II Code Decreased engine performance is defined as a Control Module VSS Output "B"

    The engine control module (PCM) performs many vital functions in a modern vehicle, such as management of the Fuel System, Ignition System, Transmission, Anti-Lock Brake and Traction Control systems. The PCM regularly runs a self-diagnosis function where it performs normal mathematical calculations, and if the results of these calculations are not as expected the PCM will set code P0609.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P0609 Code

    • Powertrain Control Module (PCM) failure
    • Wiring issue
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