What Does U0203 Mean?
Communication has been lost with Door Control Module E (typically cargo door, liftgate, or additional door module). The vehicle's communication network cannot establish proper data exchange with this module.
Common Causes
30%
Door/liftgate control module power or ground circuit failure
28%
CAN bus wiring fault in liftgate/cargo door harness (open or short)
25%
Door/liftgate control module internal failure
12%
Connector corrosion or damage in hinge/jamb area
5%
Network circuit short to ground or power
Diagnostic Steps
1
Step 1: Inspect liftgate/cargo door harness in hinge area for pinching, wear, or damage from repeated operation
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 - $1,000
Parts + labor, varies by vehicle and location
Communication has been lost with Door Control Module E (typically cargo door, liftgate, or additional door module). The vehicle's communication network cannot establish proper data exchange with this module.
The most common cause of U0203 (Lost Communication With "Door Control Module E") is: Door/liftgate control module power or ground circuit failure
Typical repair costs for U0203 range from $200 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive. Power liftgate, cargo door functions, locks, and 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 U0203 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
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