Network
generic / SAE
U0101
Lost Communication with TCM
The ECU has stopped receiving messages from the transmission control module. The transmission falls into limp-home mode (typically locked in 3rd or 4th gear), the speedometer may stop working, and shift adaptation freezes.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 01
Possible causes
- TCM unpowered or grounded poorly high
- CAN wiring to TCM broken medium
- Gateway module routing CAN messages incorrectly low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 50–2000 €
- Estimated time: 0.5–8 h
- Component: tcm
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012