What Does U0143 Mean?
Lost communication with Body Control Module 'C'. This indicates a third BCM in the vehicle's network architecture is not responding to diagnostic requests.
Common Causes
35%
Body Control Module 'C' failure or internal fault
25%
Connector corrosion, damage, or poor connection at BCM 'C'
20%
Open or shorted CAN bus wiring to BCM 'C'
15%
Power or ground circuit fault affecting BCM 'C'
5%
Incompatible software version or module configuration
Diagnostic Steps
1
Step 1: Reference service information to locate BCM 'C' and inspect all electrical connections
2
Step 2: Verify BCM 'C' has proper battery voltage on power feeds and good ground connections
3
Step 3: Test CAN bus signals at BCM 'C' using oscilloscope or multimeter (verify signal presence and voltage levels)
4
Step 4: Attempt module wake-up or identification procedures using manufacturer scan tool
5
Step 5: Inspect wiring harness routing for damage, check for proper CAN bus termination resistance
Estimated Repair Cost
$150 - $1,400
Parts + labor, varies by vehicle and location
Lost communication with Body Control Module 'C'. This indicates a third BCM in the vehicle's network architecture is not responding to diagnostic requests.
The most common cause of U0143 (Lost Communication With Body Control Module "C") is: Body Control Module 'C' failure or internal fault
Typical repair costs for U0143 range from $150 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Depending on BCM 'C' functions, may affect comfort or safety features. Verify brake lights, turn signals, and warning systems operate properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0143 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network - Zone C
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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