GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC K Sierra - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Wiring Harness Replacement

Tools Required
    • J 44257 Main Wiring Harness Connector Remover
    • J 44247 Internal Wiring Harness Installer

Removal Procedure

    Object Number: 659284 Size: SH

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
  2. Disconnect the external wiring harness from the main transmission connector. Use J 44257 , if connector is not easily accessible.

    3. Important: The main transmission connector is actually one end of the internal wiring harness that protrudes through the transmission case.


    Object Number: 659022 Size: SH
  3. Place a 30 mm or 1 3/16 inch 12-point deep socket or box-end wrench (2) over the main transmission connector (1).
  4. Push inward on the socket or wrench to release the retaining feet that attach the connector (1) to the transmission case.
  5. Remove the wrench. Push inward on the electrical connector to separate from the transmission case.

    6. Object Number: 658993 Size: SH
  6. Disconnect the internal wiring harness connectors (1) from solenoids A through G and from the transmission fluid pressure (TFP) switch.

    7. Important: The solenoid retainers for E and D solenoid also retain tabs on the wiring harness U-channel. The solenoids will remain in position even after the solenoid retainers are removed.

  7. Remove the solenoid retainers (2) for solenoids E and D.
  8. Remove the internal wiring harness from the transmission.

Installation Procedure

    Object Number: 1364373 Size: SH
  1. Align the tabs (8) on the new wiring harness U-channel with the solenoid retainer slots for solenoids E (3) and D (2) on the control valve assembly. Install the solenoid retainers (14) for the E (3) and D (4) solenoids.

    2. Important: The internal wiring harness connectors (7), (9)-(13), and (15) should be in the correct position for installation because of their pre-assembled position in the U-channel.

  2. Attach the internal wiring harness connectors to solenoids A through F and to the TFP switch.
    3. •  Connector (13) goes to solenoid (6).
    • Connector (12) goes to solenoid (4).
    • Connector (7) goes to solenoid (5).
    • Connector (10) goes to solenoid (2).
    • Connector (11) goes to solenoid (3).
    • Connector (9) goes to solenoid (1).
    • Connector (15) goes to solenoid (16)

    Object Number: 1364395 Size: SH
  3. Push the main transmission connector (2) outward through hole (1) in the transmission case until the retaining feet on the connector are near the locked position.

    4. Object Number: 1364397 Size: SH
  4. Use J 44247 to seat the retaining feet on transmission connector (1).
  5. Install the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
  6. Connect the external wiring harness to the main transmission connector.