how to fix P0701 code in GMC Sierra T1XX (2019-Present)

Learn how to diagnose and fix P0701 transmission control issues in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely raised if necessary.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid pan using a socket set.
  2. Allow old fluid to drain completely into a suitable container.
  3. Inspect the pan for metal shavings or debris, which indicates internal damage.
  4. Replace the transmission filter if applicable.
  5. Reinstall the pan with a new gasket, torquing the bolts to manufacturer specifications.
  6. Refill the transmission with the appropriate type of fluid.

3. Repair or Replace TCM

• Sub-steps:
  1. If the TCM is faulty, locate it (usually found near the transmission or under the dashboard).
  2. Disconnect the wiring harness from the TCM.
  3. Remove the mounting bolts and take out the old TCM.
  4. Install the new TCM by reversing the removal steps.
  5. Reconnect the wiring harness securely.

4. Inspect and Test Wiring

• Sub-steps:
  1. Use a multimeter to check for continuity in the wiring harness connected to the TCM.
  2. Repair or replace any damaged wiring or connectors.
  3. Ensure all connections are tight and free of corrosion.