OBD-II code · Network
U029C Lost Communication With Drive Motor Control Module D
The vehicle bus reports loss of communication with drive motor control module D. Torque commands for this EV/hybrid traction motor cannot be coordinated, forcing the powertrain into a degraded mode.
Is it safe to drive with U029C?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Drive Motor Control Module D, Vehicle Bus Wiring
Related codes
- U0117Lost Communication with Drive Motor Control Module 2
- U0292Lost Communication With Drive Motor Control Module B
- U029BLost Communication With Drive Motor Control Module C
- U0299Lost Communication With DC/DC Converter Control Module B
- U029ALost Communication With Hybrid/EV Battery Pack Sensor Module
- U029DLost Communication With NOx Sensor A
- U029ELost Communication With NOx Sensor B
- U029FLost Communication With Evaporative Emission System Leak Detection Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.