Invalid Data Received from TCM
2003-2003 Mazda B2300 2.3L I4
The 2003 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed u0402 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The data received from the Transmission Control Module is invalid, out of range, or corrupted.
Symptoms
- Transmission shifting issues
- Erratic shift points
- Check Engine Light
- Transmission slip feeling
- Limp mode
Common Causes
- TCM software glitch
- CAN bus noise on TCM circuit
- TCM internal failure
- Bad ground connection
- Wiring interference near TCM
Diagnostic Steps
- Check TCM for stored codes
- Update TCM software
- Test CAN bus signal quality at TCM
- Inspect TCM ground connections
- Check for wiring damage near TCM
Repair Notes
Reprogram TCM. Check CAN bus quality and TCM ground connections.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0402 on Other Vehicles
Common Questions
What does code U0402 mean on a 2003-2003 Mazda B2300?
U0402 stands for "Invalid Data Received from TCM". The data received from the Transmission Control Module is invalid, out of range, or corrupted.
What are the symptoms of U0402 on a Mazda B2300?
Common symptoms of U0402 include: Transmission shifting issues, Erratic shift points, Check Engine Light, Transmission slip feeling, Limp mode.
What causes U0402 on a 2003-2003 Mazda B2300?
Common causes of U0402 include: TCM software glitch, CAN bus noise on TCM circuit, TCM internal failure, Bad ground connection, Wiring interference near TCM.
Last updated: March 2026