What Does U0503 Mean?
Door Control Module D (typically right rear door) is sending corrupted or out-of-specification data to the vehicle network. The module is present on the network but transmitting invalid information.
Common Causes
35%
Failed door control module D requiring replacement
25%
Corroded or water-damaged connector at right rear door module
20%
Wiring damage or short in right rear door CAN network circuit
12%
Power supply issue or intermittent ground connection
8%
Module programming issue or calibration mismatch
Diagnostic Steps
1
Step 1: Verify proper voltage and ground at door control module D; check for voltage fluctuations during door operation
2
Step 2: Inspect right rear door module connector and harness for physical damage, corrosion, or loose connections
3
Step 3: Perform functional test of right rear door components while monitoring module data output for abnormalities
4
Step 4: Check CAN bus termination and continuity between module D and main network junction
5
Step 5: If electrical system is intact, reprogram or initialize module; replace if fault persists after configuration
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
Door Control Module D (typically right rear door) is sending corrupted or out-of-specification data to the vehicle network. The module is present on the network but transmitting invalid information.
The most common cause of U0503 (Invalid Data Received From "Door Control Module D") is: Failed door control module D requiring replacement
Typical repair costs for U0503 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Right rear door locks, windows, or child lock features may be inoperative. Does not impact vehicle safety for driving but may affect rear passenger security.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0503 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network / Door Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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