What Does U0204 Mean?
Communication has been lost with Door Control Module F (typically sliding door module or additional door on extended-body vehicles). The control module monitoring the network has detected loss of messages from this specific door module.
Common Causes
30%
Sliding door control module power or ground circuit failure
28%
CAN bus wiring fault in sliding door harness (open, short, or damaged by door movement)
25%
Sliding door control module internal failure
12%
Connector corrosion or damage in sliding door track/jamb area
5%
Network circuit short to ground or power
Diagnostic Steps
1
Step 1: Inspect sliding door harness in track/jamb area for pinching, wear, or damage from repeated door 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 F (typically sliding door module or additional door on extended-body vehicles). The control module monitoring the network has detected loss of messages from this specific door module.
The most common cause of U0204 (Lost Communication With "Door Control Module F") is: Sliding door control module power or ground circuit failure
Typical repair costs for U0204 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 sliding door operation, locks, windows, and safety features 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 U0204 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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