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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Automatic Transmission Servicing (4L60-E)) >> Removal & Installation >> TCC Solenoid, TCC PWM Solenoid & Wiring Harness >> Removal

TCC Solenoid, TCC PWM Solenoid & Wiring Harness: Removal

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support the vehicle. Remove the transmission oil pan and the filter. See DRAINING & REFILLING  under LUBRICATION.
  2. Disconnect the transmission harness 20-way connector from the transmission internal harness pass-through connector. See Fig 2 . 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.
  3. Remove the 1-2 accumulator assembly. DO NOT remove the spacer plate. See ACCUMULATOR ASSEMBLY  .
  4. Disconnect the internal wiring harness electrical connectors from the transmission fluid pressure switch, 1-2 shift control solenoid, 2-3 shift control solenoid, pressure control solenoid, TCC PWM solenoid and 3-2 shift control solenoid. See Fig 1 .
  5. Remove the TCC PWM solenoid retainer. Remove the TCC PWM solenoid to access one of the TCC solenoid retaining bolts. See Fig 3 .
  6. Remove the pressure control solenoid retainer. Remove the pressure control solenoid. See Fig 4 . Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness. See Fig 5 .
  7. Using power piston seal protector and diaphragm retainer installer, release the pass-through electrical connector from the transmission case. See Fig 6 . Use the small end of the power piston seal protector and diaphragm retainer installer over the top of the connector. Twist to release the 4 tabs retaining the connector. Pull the harness connector down through the transmission case.
  8. Remove the TCC solenoid (with "O" ring seal) and wiring harness assembly from the transmission case.
  9. Inspect the TCC solenoid and wiring harness assembly for the following defects: Damage, cracked connectors, exposed wires and loose pins. See Fig 7 .
Fig 1: Identifying Internal Transmission Wire Harness
G00057012Courtesy of GENERAL MOTORS CORP.
Fig 2: Disconnecting/Connecting Transmission Harness Connector
G00057010Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing/Installing TCC PWM Solenoid
G00056988Courtesy of GENERAL MOTORS CORP.
Fig 4: Removing/Installing Pressure Control Solenoid
G00056998Courtesy of GENERAL MOTORS CORP.
Fig 5: Removing/Installing Valve Body/TCC Solenoid Bolts
G00057011Courtesy of GENERAL MOTORS CORP.
Fig 6: Removing/Installing Internal Wiring Harness
G00089850Courtesy of GENERAL MOTORS CORP.
Fig 7: Inspecting Internal Wiring Harness
G00057012Courtesy of GENERAL MOTORS CORP.
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