U0402

Invalid Data Received From TCM

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Transmission transition to emergency mode
Incorrect gear shifting
Check Engine Light Illuminates
Reduced engine power
Increased fuel consumption

Causes

Wiring problems between ECU and TCM
TCM module malfunction
Problems with connectors
CAN bus fault
Software errors in modules

How to Fix

Check wiring integrity between ECU and TCM
Inspect and clean connectors
Carry out CAN bus diagnostics
Update module software
Replace TCM if necessary

Related codes

U0401 U0403 U0100