العربية
U0142

Lost Communication With Body Control Module "B"

Car Fault Codes Network

Severity Medium Do not ignore it; it may get worse and cost more.
Can you still drive? With care, short trips only
Who can fix it? Needs a workshop
Typical repair time 30 minutes – 5 hours
Typical cost SAR 100 to 6,000

What it means

This code appears on vehicles with more than one body control module and means a module on the network is no longer receiving messages from module B. The maker decides what this module controls; it may be a rear unit that runs the tail lights and tailgate, or another unit in the cabin. Symptoms follow the functions tied to it on your vehicle.

Related codes: U0140U0141U0422U0199U0019

Symptoms4

  • Electrical functions tied to module B stop working, such as rear lights, the tailgate, seats or windows depending on the vehicle.
  • Warning lights or messages in the cluster.
  • Some functions working intermittently.
  • Other lost-communication codes with body or door modules.

Possible causes6

  • Weak battery or loose terminals.
  • Blown power fuse for module B.
  • Water in the module or its connectors, especially when it sits in the trunk or under the seats.
  • Poor ground connection.
  • Open or shorted network wiring to the module.
  • Internal failure of module B.

How to diagnose5

  1. Use the service information to find which module the letter B refers to, where it is and what it controls.
  2. Test the battery, then try to connect to the module with a scan tool.
  3. If the module does not respond, check its fuses, power and ground at the connector.
  4. Check the module location for water, such as the trunk or cabin floor, and inspect its connectors.
  5. Check the network lines to the module and compare their resistance with the manufacturer specification.

How to fix5

  1. Charge or replace the battery and replace any blown fuse.
  2. Dry the module area, fix the leak and clean the connectors.
  3. Repair damaged network wiring or grounds.
  4. Replace module B if proven faulty, then program it with the manufacturer tool.
  5. Clear codes in all modules and test the functions tied to the module.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a battery, fuse or connector, rises with water damage, and reaches the upper end when the module is replaced and programmed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

How do I know which module is B on my car?

From the service information for your vehicle or a scan tool that shows module names, because makers differ in how they name body modules and split their functions.

Is this code dangerous?

It usually does not affect the engine, but if the module runs the tail lights or brake lights, it becomes a safety risk, so check your lights and repair it soon.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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Related codes

U0140 Lost Communication With Body Control Module High Network U0141 Lost Communication With Body Control Module "A" Medium Network U0422 Invalid Data Received From Body Control Module Medium Network U0199 Lost Communication With Door Control Module "A" Low Network U0019 Low Speed CAN Communication Bus Medium Network U0100 Lost Communication With ECM/PCM "A" High Network