What Does U0221 Mean?
The body control module cannot communicate with door switch G on the communication network. This network fault prevents proper operation of door-related functions controlled by this specific switch module.
Common Causes
35%
Wire breakage in door jamb harness from repetitive door movement
30%
Failed door switch G module electronics
20%
Water damage or corrosion at door module connector
10%
CAN bus communication line fault
5%
BCM internal communication circuit failure
Diagnostic Steps
1
Step 1: Inspect wiring harness in door hinge area for breaks, cuts, or excessive wear from door movement
2
Step 2: Disconnect and inspect door switch G module connector for bent pins, corrosion, or water entry
3
Step 3: Attempt to establish communication with door switch G module using bi-directional scan tool controls
4
Step 4: Check voltage supply and ground integrity at door module connector; should have battery voltage and solid ground
5
Step 5: Measure CAN bus resistance and check for proper termination (should read approximately 60 ohms with all modules connected)
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The body control module cannot communicate with door switch G on the communication network. This network fault prevents proper operation of door-related functions controlled by this specific switch module.
The most common cause of U0221 (Lost Communication With "Door Switch G") is: Wire breakage in door jamb harness from repetitive door movement
Typical repair costs for U0221 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety risk to vehicle operation. Affected door's power functions such as locks, windows, and courtesy lights may not operate properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0221 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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