U0141

Universal

Lost Communication With Body Control Module A

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The vehicle has detected that another control module cannot communicate with Body Control Module A over the vehicle network. The body control module helps manage body-related functions, so communication loss may affect features it controls. This code does not by itself prove the module has failed; power, ground, wiring, connectors, or network issues can also interrupt communication.

Report an error with this code

⚠️ Before You Begin (Safety First)

If lighting, door locks, windows, or another body function needed for safe operation is not working, avoid driving until it is checked. Stop in a safe place if essential exterior lights fail or the vehicle develops other unsafe electrical symptoms. Do not probe airbag wiring or disconnect control modules while the vehicle is powered.

Common Symptoms

  • There may be no noticeable symptoms if the communication loss is intermittent or does not affect a function currently in use.
  • Body-related features controlled or coordinated by the body control module may stop working or behave unpredictably; the affected features vary by vehicle.
  • A warning light or message may appear if another module reports the communication loss.
  • Other control modules may store communication codes if they also lose contact with the body control module.

Common Causes

  • A weak or unstable vehicle battery or charging-system issue may interrupt module communication.
  • A blown fuse or a problem with power or ground to the body control module may prevent it from operating or communicating.
  • A loose, damaged, or corroded connector may interrupt the module's power, ground, or network connection.
  • Open, shorted, or damaged network wiring may prevent messages from reaching the body control module.
  • The body control module may have an internal fault, but this should be considered only after its power, grounds, connectors, and network wiring are checked.

Diagnostic Steps

  1. Note which body functions are not working and whether the problem is constant or intermittent; this can help narrow down what is affected.
  2. Check the battery terminals for looseness or visible corrosion, and note any other signs of low battery voltage.
  3. With the vehicle off, check the relevant fuses using the owner's manual. Replace a blown fuse only with the specified type, and do not repeatedly replace a fuse that blows again.
  4. Visually inspect accessible wiring and connectors around the body control module for looseness or damage, without unplugging connectors or disturbing airbag wiring.
  5. If the code returns or functions remain affected, have the vehicle scanned across all modules and the network, with model-specific checks of BCM power, ground, and wiring.

When to Call a Professional

A technician can scan all modules to confirm which units are communicating and check for related network codes. Diagnosis may include checking battery condition, BCM power and grounds, connectors, and network wiring using vehicle-specific service information. Replace a module only after its circuits and network connections have been checked.

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Commonly Asked Questions

Does U0141 mean the body control module needs to be replaced?

No. The code indicates lost communication, not a confirmed module failure. Battery condition, fuses, power and ground circuits, connectors, and network wiring should be checked first.

Can I keep driving with U0141?

It depends on which functions are affected. If essential exterior lighting or another function needed for safe operation is not working, do not continue driving until it is checked.

Why should other modules be scanned too?

Other modules may record communication faults that help identify whether the issue is limited to one connection or involves a wider network or power problem.

Can U0141 appear even if the vehicle seems normal?

Yes. A communication interruption can be intermittent or may not affect a function you notice. A scan and inspection can help determine whether the fault is current or intermittent.

Are the affected functions the same on every vehicle?

No. The functions managed by Body Control Module A and the diagnostic procedure vary by model, year, and engine. Use vehicle-specific service information to identify applicable circuits and procedures.

Browse Available Code Guides

Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.