Network
generic / SAE
U0103
Lost Communication with Gear Shift Module
The Gear Shift Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Shift-by-wire gear selection can fail and leave the transmission in a default position. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 03
Possible causes
- Shift module unpowered high
- CAN wiring to shift module 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: 80–1800 €
- Estimated time: 1–5 h
- Component: gear shift module
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012