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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P1860: Open Or Short In TCC PWM Solenoid Valve Circuit Or TCC PWM Solenoid Valve >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4. This step tests for voltage to the solenoid.
  2. 5. This step tests the ability of the PCM and wiring to control the ground circuit.
  3. 7. This step tests the resistance of the TCC PWM solenoid valve and the automatic transmission wiring harness assembly.
Fig 1: DTC P1860 (1 Of 3)
G02424395Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P1860 (2 Of 3)
G02424396Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P1860 (3 Of 3)
G02424397Courtesy of GENERAL MOTORS CORP.
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