What Does U029C Mean?
Communication has been lost with Drive Motor Control Module D on the vehicle's network bus. This affects vehicles with multiple motor control units, preventing proper coordination of drive motor operation.
Safety Warning
Vehicle propulsion may be severely limited or disabled. Unexpected loss of drive power creates significant safety hazard.
Common Causes
35%
Drive Motor Control Module D failure or internal malfunction
30%
Wiring harness damage or connector corrosion to Module D
20%
CAN network fault on Module D circuit segment
10%
Module D software issue or programming incomplete
5%
Poor ground connection at Module D mounting location
Diagnostic Steps
1
Step 1: Check power supply voltage and ground integrity at Drive Motor Control Module D connector
2
Step 2: Thoroughly inspect Module D wiring harness and connectors for physical damage or water intrusion
3
Step 3: Measure CAN High and CAN Low voltage at Module D (should read approximately 2.5V each)
4
Step 4: Compare communication status of all motor control modules to isolate if issue is Module D specific
5
Step 5: Attempt module reflash/reprogramming before replacement; swap module if programming fails
Estimated Repair Cost
$300 - $2,500
Parts + labor, varies by vehicle and location
Communication has been lost with Drive Motor Control Module D on the vehicle's network bus. This affects vehicles with multiple motor control units, preventing proper coordination of drive motor operation.
The most common cause of U029C (Lost Communication With Drive Motor Control Module "D") is: Drive Motor Control Module D failure or internal malfunction
Typical repair costs for U029C range from $300 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle propulsion may be severely limited or disabled. Unexpected loss of drive power creates significant safety hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U029C to identify the root cause.
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Quick Info
Category
Network
System
Hybrid/Electric Powertrain
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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