Engine-Codes.com
Engine-Codes – Generic – U0142

U0142 Code - Lost Communication with Body Control Module 'B'

Quick Answer

The U0142 code indicates that there is a communication problem between the vehicle's main computer (PCM) and the Body Control Module 'B' (BCM). Common causes include Loose or corroded wiring connections between the PCM and BCM, Faulty BCM or PCM, Water damage or moisture intrusion affecting the communication lines. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U0142 indicates Lost Communication with Body Control Module 'B'.
Common causes
Common causes include Loose or corroded wiring connections between the PCM and BCM, Faulty BCM or PCM, Water damage or moisture intrusion affecting the communication lines.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0142 Description

The U0142 code indicates that there is a communication problem between the vehicle's main computer (PCM) and the Body Control Module 'B' (BCM). The BCM is responsible for controlling various body functions such as interior lighting, power windows, door locks, and more. When communication is lost with the BCM, it can lead to malfunctions in these systems, affecting the overall performance and functionality of the vehicle.

OBDII Code U0142 - Lost Communication with Body Control Module 'B'
U0142 Code - Lost Communication with Body Control Module 'B'

Common Causes of U0142

  1. Loose or corroded wiring connections between the PCM and BCM.
  2. Faulty BCM or PCM.
  3. Water damage or moisture intrusion affecting the communication lines.
  4. Electrical issues such as a blown fuse or relay.
  5. Software glitches or programming errors within the vehicle's computer systems.

Symptoms of U0142

  1. Interior lights not working properly or flickering.
  2. Power windows or door locks not responding.
  3. Dashboard warning lights illuminated.
  4. Issues with the vehicle's remote keyless entry system.
  5. Problems with the vehicle's anti-theft system.

How to Fix U0142

  1. Begin by checking and repairing any loose or corroded wiring connections between the PCM and BCM.
  2. Inspect for any signs of water damage or moisture intrusion and address accordingly.
  3. Test the BCM and PCM for faults using a diagnostic scanner and replace if necessary.
  4. Check and replace any blown fuses or relays related to the communication system.
  5. Perform a software update or reprogram the vehicle's computer systems to address any programming errors.

Cost to Fix U0142

The typical repair costs for addressing a U0142 code can range from $200 to $500, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or metropolitan areas, while independent shops may offer lower prices.

What does this mean?

Tech Notes for U0142

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

Need more information about the U0142 code?

Need more information on how to fix the U0142 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0142 code diagnosed by a professional: Find a repair shop in your area

Code U0142 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0142 Code

No Frequently Asked Questions about U0142 Code found.

Discuss the causes and fixes for U0142 OBDII Code

Submit a New Comment

Code U0142 comments

No comments found for this page.