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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P0894: Excessive TCC Slip Speed In D4 OVERDRIVE, When The TCC Should Be Engaged >> Test Description

Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  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 P0894.
  2. 4. This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in fourth 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 third gear.
  4. 6. This step tests for a sticking TCC shift valve.
  5. 7. This step tests for proper transmission line pressure.
Fig 1: DTC P0894 (1 Of 2)
G02424388Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0894 (2 Of 2)
G02424389Courtesy of GENERAL MOTORS CORP.
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