What Does U0230 Mean?
The vehicle network has lost communication with the Rear Gate Module, which controls power liftgate or tailgate functions. This affects the ability to monitor or control rear gate operation through the vehicle's control system.
Common Causes
30%
Failed rear gate control module or internal electronics failure
35%
Damaged wiring harness between body and rear gate (flexing damage)
20%
Corroded or loose connector at rear gate module location
10%
Power supply or ground circuit failure to rear gate module
5%
Body control module or CAN bus circuit malfunction
Diagnostic Steps
1
Step 1: Verify fuse condition and power supply at rear gate module connector
2
Step 2: Inspect wiring harness in hinge area for broken wires, chafing, or damage from repeated flexing
3
Step 3: Test ground circuit continuity and resistance from module to chassis ground
4
Step 4: Check CAN bus signal voltage at rear gate module connector (should be 2.5V nominal)
5
Step 5: Substitute rear gate module with known good unit to confirm module failure
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The vehicle network has lost communication with the Rear Gate Module, which controls power liftgate or tailgate functions. This affects the ability to monitor or control rear gate operation through the vehicle's control system.
The most common cause of U0230 (Lost Communication With Rear Gate Module) is: Failed rear gate control module or internal electronics failure
Typical repair costs for U0230 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Moderate concern if power liftgate cannot be controlled and may close unexpectedly. Manual operation should still be possible for egress.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0230 to identify the root cause.
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Quick Info
Category
Network
System
Body Control and Access Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
