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GMC YukonModel years 2000–2006

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← Look into the faults of the GMC Yukon

Trouble code

P1870: possible causes and documented repairs — 2000–2006 GMC Yukon

Of the records of the 2000–2006 GMC Yukon, 1 state trouble code P1870 (Manufacturer communication: 1). The technical documents say how to deal with 1 of its possible causes. They are listed by the number of matching records, most first.

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Causes the technical documents say how to deal with (1)

  1. 4L60-E / 4L65-E TCC regulator valve bore wear (P1870 converter clutch slip)

    No matching record (stated by the technical documents)

    Continuous oscillation of the regulator valve in PWM and EC3 units wears the bore over time so that apply pressure exhausts.

    This often sets code P1870 and/or P0894 because of excess TCC slip.

    How to tell

    What to do

    1. As the regulator bore wears, the duty cycle needed to keep slip in range increases.
    2. TCC problems can often be spotted before they set codes by monitoring duty cycle with a scan tool.
    3. Per Sonnax, a worn TCC regulator valve bore is restored by installing its TCC regulator and isolator valve kit 77754-04K or 77754-03K.

    All steps, part numbers and sources (3 sources) →

Related symptoms, trouble codes and warning displays

What the technical documents state together with the faults above.

Symptom
Shifting fault
Trouble code
P0894

Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.