What Does U0142 Mean?
Communication lost with Body Control Module 'B'. In multi-BCM architectures, this module manages a separate zone or subset of body electrical functions from BCM 'A'.
Common Causes
35%
Body Control Module 'B' internal failure or corruption
25%
Connector issues at BCM 'B' location (corrosion, loose pins, water intrusion)
20%
CAN network wiring damage between BCM 'B' and main network
15%
BCM 'B' power supply or ground circuit malfunction
5%
Module programming error or software mismatch
Diagnostic Steps
1
Step 1: Locate BCM 'B' per vehicle service documentation and visually inspect connectors for damage
2
Step 2: Test power supply and ground circuits at BCM 'B' to verify proper voltage and continuity
3
Step 3: Check CAN bus voltage levels at BCM 'B' connector (CAN-H and CAN-L should both be present)
4
Step 4: Use scan tool to attempt forced communication or module identification with BCM 'B'
5
Step 5: Check wiring continuity between BCM 'B' and other network modules, test for shorts or open circuits
Estimated Repair Cost
$150 - $1,400
Parts + labor, varies by vehicle and location
Communication lost with Body Control Module 'B'. In multi-BCM architectures, this module manages a separate zone or subset of body electrical functions from BCM 'A'.
The most common cause of U0142 (Lost Communication With Body Control Module "B") is: Body Control Module 'B' internal failure or corruption
Typical repair costs for U0142 range from $150 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May affect zone-specific functions such as doors, windows, or auxiliary lighting. Verify all safety-critical systems operate correctly before driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0142 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network - Zone B
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
