What Does U0201 Mean?
Communication has been lost with Door Control Module C (typically rear driver side door module). The body control or gateway module cannot establish network communication with this door module.
Common Causes
30%
Door control module power or ground circuit failure
28%
CAN bus wiring fault in door harness (open, short, or damaged by door flexing)
25%
Door control module internal failure
12%
Connector corrosion or damage in door jamb area
5%
Network circuit short to ground or power
Diagnostic Steps
1
Step 1: Inspect door harness in door jamb area for pinching, wear, or damage from repeated door opening/closing
2
Step 2: Check power and ground at door control module connector with multimeter (key on)
3
Step 3: Measure CAN bus voltage at door module connector - should see approximately 2.5V on each CAN line with fluctuation during communication
4
Step 4: Disconnect door module and check for short circuits in harness; verify other modules still communicate properly
5
Step 5: Replace door control module if wiring and power are verified good, then reconfigure/program as required
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
Communication has been lost with Door Control Module C (typically rear driver side door module). The body control or gateway module cannot establish network communication with this door module.
The most common cause of U0201 (Lost Communication With "Door Control Module C") is: Door control module power or ground circuit failure
Typical repair costs for U0201 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive. Door locks, windows, mirrors, and courtesy lighting on affected door may not function properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0201 to identify the root cause.
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Quick Info
Category
Network
System
Body Control/Door Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
