What Does U043C Mean?
Invalid or corrupted data is being received from a secondary Body Control Module over the vehicle network. Vehicles with multiple BCMs use this code when BCM B sends implausible information.
Common Causes
35%
Failed Body Control Module B with internal circuit fault
25%
Damaged or corroded wiring harness to BCM B
20%
Poor ground connection at Body Control Module B
15%
CAN bus network fault affecting body systems communication
5%
Voltage supply issue to BCM B causing erratic operation
Diagnostic Steps
1
Step 1: Identify which body control functions are affected (lighting, locks, windows, etc.) to isolate BCM B circuits
2
Step 2: Inspect all connectors at Body Control Module B for corrosion, bent pins, or poor connections
3
Step 3: Verify power supply and ground circuits at BCM B meet specifications using wiring diagram
4
Step 4: Use scan tool bi-directional controls to command BCM B outputs and verify proper response
5
Step 5: Monitor CAN bus signals between BCM A and BCM B to identify communication failures or data errors
Estimated Repair Cost
$250 - $1,500
Parts + labor, varies by vehicle and location
Invalid or corrupted data is being received from a secondary Body Control Module over the vehicle network. Vehicles with multiple BCMs use this code when BCM B sends implausible information.
The most common cause of U043C (Invalid Data Received From Cruise Control Front Distance Range Sensor Right) is: Failed Body Control Module B with internal circuit fault
Typical repair costs for U043C range from $250 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Various comfort and convenience features may malfunction including lights, locks, or wipers. Lighting issues could affect safety in low visibility conditions. Vehicle is generally drivable but may have compromised features.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U043C to identify the root cause.
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Quick Info
Category
Network
System
Body Control / Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
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