U0101
Lost Communication with TCM
2008-2008 Mazda Tribute 2.5L I4
High SeverityNetworkGeneric (SAE)
The 2008 Mazda Tribute is equipped with a 2.5L inline-4 engine. Below you'll find detailed u0101 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate with the Transmission Control Module.
Symptoms
- Check Engine Light
- Transmission in limp mode
- Harsh shifting or no shifting
- Trans warning light
Common Causes
- TCM power/ground failure
- CAN bus wiring to TCM
- TCM failure
- Fuse blown
Diagnostic Steps
- Check TCM fuses
- Test power and ground at TCM
- Check CAN bus wiring
- Try direct communication with TCM
Repair Notes
Check fuses and power supply. Verify CAN bus.
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
U0101 on Other Vehicles
Common Questions
What does code U0101 mean on a 2008-2008 Mazda Tribute?
U0101 stands for "Lost Communication with TCM". Cannot communicate with the Transmission Control Module.
What are the symptoms of U0101 on a Mazda Tribute?
Common symptoms of U0101 include: Check Engine Light, Transmission in limp mode, Harsh shifting or no shifting, Trans warning light.
What causes U0101 on a 2008-2008 Mazda Tribute?
Common causes of U0101 include: TCM power/ground failure, CAN bus wiring to TCM, TCM failure, Fuse blown.
Last updated: March 2026