Our automotive experts have put together the following information about the P257A 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 P257A code.

OBD II Fault Code

  • OBD II P257A

    OBD-II Code Climate control systems will not work is defined as a Vacuum Reservoir Control Circuit/Open

    Diesel vehicles have a separate vacuum pump an reservoir because they cannot utilize vacuum from the engine the way a gasoline vehicles can. The engine control module (PCM) tells the vacuum pump when to turn on an off. If the PCM cannot control the pump, it will set code P257A.

    Climate control systems will not work Symptoms

    • Climate control systems will not work

    Common Problems That Trigger the P257A Code

    • Damaged vacuum reservoir
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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