P0873 Code - Transmission Fluid Pressure Sensor/Switch 'C' Circuit High

Discussion in 'P - Powetrain Codes' started by fault code, Mar 28, 2018.

  1. fault code

    fault code Administrator Staff Member

    May 11, 2017
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    What does P0873 Mean?

    The vehicle's Powertrain Control Module (PCM) is fed information on many aspects of the vehicle's systems, including transmission fluid pressure. In a P0873, the sensor in the transmission system's C circuit has detected a pressure level that extends beyond the manufacturer's set limits.

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    What are the common causes of P0873 ?

    Common causes include a low transmission fluid condition (caused by a transmission fluid leak), a defective transmission high pressure pump, a faulty or slipping transmission, a faulty transmission temperature sensor, overheating engine, or faulty PCM. When this code is set, it is imperative that the transmission be checked prior to further vehicle operation.


    How do you troubleshoot P0873 ?

    You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

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