how to diagnose P0750 code in GMC Sierra T1XX (2019-Present)?

Learn how to diagnose and fix P0750 transmission shift solenoid issue in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace the Shift Solenoid

• Remove the Transmission Pan:

  • Use a socket set to remove the bolts securing the transmission pan.
  • Carefully lower the pan and drain the transmission fluid into a suitable container.

• Access the Shift Solenoid:

  • Remove any necessary components blocking access to the shift solenoid, such as the valve body cover.

• Remove the Old Solenoid:

  • Disconnect the electrical connector from the shift solenoid.
  • Remove bolts holding the solenoid in place and take it out.

• Install the New Solenoid:

  • Position the new shift solenoid and secure it with bolts to the valve body.
  • Reconnect the electrical connector.

3. Reassemble and Refill

• Reinstall the Transmission Pan:

  • Clean the gasket surface on both the pan and transmission.
  • Install a new gasket and secure the pan in place.

• Refill Transmission Fluid:

  • Use the manufacturer-recommended transmission fluid.
  • Start the vehicle and allow it to reach operating temperature, then check and adjust fluid level as necessary.

4. Clear Codes and Test Drive

• Reconnect the battery and use the OBD-II scanner to clear any stored codes.
• Perform a test drive to ensure proper shifting and operation of the transmission.