P0870 Code - Transmission Fluid Pressure Sensor/Switch 'C' Circuit

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

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    fault code Administrator Staff Member

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    What does P0870 Mean?

    The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0870 engine fault code on your engine code reader this description will help you.

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    What are the common causes of P0870 ?

    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.

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    How do you troubleshoot P0870 ?

    With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

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