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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transmission Diagnosis - 4L80-E (Diesel)) >> Diagnostic Tests >> DTC P1870: Transmission Component Slipping >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

  1. 3

    This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch can set a DTC P1870.

  2. 4

    This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 4th gear; and confirms that the fault is present.

  3. 5

    This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 3rd gear.

  4. 6

    This step tests for a sticking TCC shift valve.

  5. 8

    This step tests for proper transmission line pressure.

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