how to diagnose U0101 code on my Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Clean TCM Connections

• Remove the TCM from its mounting location.
• Disconnect the wiring harness from the TCM.
• Inspect the connector pins for corrosion or damage; clean with electrical contact cleaner if necessary.
• Reconnect the wiring harness securely.

3. Check Power and Ground

• Reconnect the battery terminal.
• Using a multimeter, check for voltage at the TCM connector; it should be around 12 volts.
• Test the ground pin of the TCM connector to ensure it has continuity to the vehicle's chassis.

4. Examine CAN Bus System

• Use a CAN bus scanner to check for communication issues. If communication is lost, trace the wiring for damage or shorts.
• Repair any damaged wires and secure connections.

5. TCM Replacement (if needed)

• If all tests indicate a faulty TCM, disconnect the battery again.
• Remove the TCM from its mounting location.
• Install a new TCM, ensuring all connections are secure.
• Reconnect the battery terminal.