What Does U0504 Mean?
Door Control Module E (typically liftgate or rear hatch in SUVs/wagons) is transmitting data that is corrupted, implausible, or outside expected parameters. Communication is present but data integrity is compromised.
Common Causes
35%
Defective liftgate or hatch control module requiring replacement
25%
Corroded connector or damaged terminals at liftgate module
20%
Damaged wiring in liftgate/hatch flex harness from repeated opening/closing
12%
Power strut interference or mechanical binding causing electrical noise
8%
Module initialization error or software version incompatibility
Diagnostic Steps
1
Step 1: Check power and ground at liftgate/hatch module; verify voltage remains stable during power strut operation
2
Step 2: Inspect flex harness between body and liftgate for broken wires, especially at hinge areas
3
Step 3: Monitor module E data stream while cycling liftgate through full range of motion to identify when data corruption occurs
4
Step 4: Test CAN bus signal integrity at module connector; look for shorts or opens in network wiring
5
Step 5: Reprogram module E if wiring is good; replace module if invalid data transmission continues
Estimated Repair Cost
$175 - $750
Parts + labor, varies by vehicle and location
Door Control Module E (typically liftgate or rear hatch in SUVs/wagons) is transmitting data that is corrupted, implausible, or outside expected parameters. Communication is present but data integrity is compromised.
The most common cause of U0504 (Invalid Data Received From "Door Control Module E") is: Defective liftgate or hatch control module requiring replacement
Typical repair costs for U0504 range from $175 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Power liftgate, rear wiper, or rear locks may malfunction. Vehicle is safe to drive but cargo access and security features may be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0504 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network / Liftgate Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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