TransmissionModerate⚠️ Professional Recommended

U0402

Q: What does OBD2 code U0402 mean?

U0402 means: Invalid Data Received From TCM. Another module on the network has received invalid or corrupted data from the transmission control module.

Invalid Data Received From TCM

Another module on the network has received invalid or corrupted data from the transmission control module.

SeverityModerate

CategoryTransmission

Est. Repair Cost$200-$800

Code TypeNetwork

DIY RepairProfessional

⚡ Common Causes

›TCM software fault
›Wiring/communication bus issue
›Failing TCM hardware

⚠️ Symptoms

›Check engine light
›Possible erratic shifting or communication issues

✅ How to Fix — Step by Step

Step 1:Scan for additional TCM-related codes
Step 2:Inspect communication bus wiring
Step 3:Reflash or replace TCM if fault persists

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Transmission Pressure Gauge
✔ATF Temperature Reader
✔Digital Multimeter
✔Basic Hand Tools

Using the correct diagnostic tools helps identify the root cause of U0402 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: As with U0401, look for additional codes stored specifically in the transmission module to find the true root cause.

Frequently Asked Questions

What does OBD2 code U0402 mean?+

U0402 stands for Invalid Data Received From TCM. Another module on the network has received invalid or corrupted data from the transmission control module.

What causes code U0402?+

TCM software fault; Wiring/communication bus issue; Failing TCM hardware

How do I fix code U0402?+

Scan for additional TCM-related codes; Inspect communication bus wiring; Reflash or replace TCM if fault persists

How much does it cost to fix U0402?+

Estimated repair cost for U0402 is $200-$800.

Is U0402 DIY-friendly?+

U0402 typically requires professional equipment and a qualified mechanic.