U0402: Invalid data received from transmission control module
Drive carefully. Get it checked within a week or two.
Can I drive with U0402?
Yes, but drive carefully and get it checked soon. Transmission reported invalid data to engine or brake systems; drive gently.
What does U0402 mean?
U0402 stands for Invalid Data Received From Transmission Control Module.
Symptoms you may notice
- Multiple warning lights on dashboard simultaneously (ABS, CEL, Airbag)
- Speedometer or instrument cluster needles bouncing or freezing
- Transmission may shift harshly or default to safe limp gear
How much does it cost to fix?
Repair costs for code U0402 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Active fault code inside the transmission computer (TCM)
- Transmission fluid level low or slipping clutch
- Electrical noise or voltage spike
- Damaged transmission connector
What to do next
- Scan the transmission computer for specific internal codes.
- Check transmission fluid level and color.
- Avoid towing or high-load acceleration.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code U0402 indicates that the transmission module transmitted an invalid status packet across the network. Investigating the transmission module directly will identify the root problem.