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TCC PWM Solenoid, TCC Solenoid & Wiring Harness: Removal

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Tools required: Seal Protector Retainer Installer (J-28458).
  1. Raise and support the vehicle.
  2. Remove the transmission oil pan and the filter. See DRAINING & REFILLING  under LUBRICATION.
  3. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. See Fig 1. Depress both tabs on the connector and pull straight up, do not pry the connector.
    NOTE: Removal of the valve body is not necessary for the following procedure.
  4. Remove the 1-2 accumulator assembly. See ACCUMULATOR ASSEMBLY . DO NOT remove the spacer plate.
  5. Disconnect the internal wiring harness electrical connectors from the following components:
    • Transmission fluid pressure switch (1).
    • 1-2 shift control solenoid (2).
    • 2-3 shift control solenoid (3).
    • Pressure control solenoid (4).
    • TCC PWM solenoid (5).
    • 3-2 control solenoid (6). See Figure.
  6. Remove the TCC PWM solenoid retainer.
  7. Remove the TCC PWM solenoid to access one of the TCC solenoid retaining bolts. See Fig 2.
  8. Remove the pressure control solenoid retainer.
  9. Remove the pressure control solenoid. See Figure.
  10. Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. See Fig 3.
  11. Using seal protector retainer installer, release the pass-through electrical connector from the transmission case. See Fig 4.
    1. Use the small end of the seal protector retainer installer over the top of the connector.
    2. Twist to release the 4 tabs retaining the connector.
    3. Pull the harness connector down through the transmission case.
  12. Remove the TCC solenoid (with "O" ring seal) and wiring harness assembly from the transmission case.
  13. Inspect the TCC solenoid and wiring harness assembly for the following defects:
    • Damage.
    • Cracked connectors.
    • Exposed wires.
    • Loose pins. See Fig 5.
Fig 1: Disconnecting & Connecting Transmission Harness Connector
G00057010Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing & Installing TCC PWM Solenoid
G00056988Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing & Installing Valve Body/TCC Solenoid Bolts
G00057011Courtesy of GENERAL MOTORS CORP.
Fig 4: Removing & Installing Internal Wiring Harness
G00056990Courtesy of GENERAL MOTORS CORP.
Fig 5: Inspecting Internal Wiring Harness
G00057012Courtesy of GENERAL MOTORS CORP.
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