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Transmission Slipping - Code P1870

This is a discussion on Transmission Slipping - Code P1870 within the Automatic Transmission forums, part of the Drivetrain category; Can anyone help? I have a 96 Impala SS that has a code of P1870 indicating the transmission is slipping. ...

  1. #1
    Junior Member
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    Black Cherry
    1996 Impala SS

    Transmission Slipping - Code P1870

    Can anyone help? I have a 96 Impala SS that has a code of P1870 indicating the transmission is slipping. Does anyone know how I can repair the trans without replacing the transmission? Any help would be great. Thanks

  2. #2
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    Saw your other post, I'd PM the guy too since it's from last year. In the meantime I found this for the 5.7: www.ls2.com/boggs/a4/DTC%20P1870%205.8.htm

  3. #3
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    Black Cherry
    1996 Impala SS

    2001NBMZ28,
    Thank you for your reply. I will look at the site and see if I can follow instructions on how to check trans.

  4. #4
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    WHITE
    1999 CAMARO Z-28

    A TFP Valve Position Switch malfunction could set DTC P1870.
    The following mechanical conditions could set DTC P1870:
    A mechanical failure of the shift solenoid valves
    A mechanical failure of the TCC Solenoid Valve
    A mechanical failure of the TCC PWM Solenoid Valve
    Internal transmission failures may set a DTC P1870.
    An engine, misfire may erroneously set a DTC P1870.
    Ensure that the final drive ratio matches the PCM's calibration.
    A PRNDL DTC may falsely set DTC P1870.

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