OBD Guide
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U184A

Lost Communication With Body Control Module On Low Speed CAN Bus

U184A is an OBD-II diagnostic trouble code meaning: Lost Communication With Body Control Module On Low Speed CAN Bus. Common causes: open or short circuit in the can bus, poor contact in bcm connectors. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Comfort functions do not work (central locking, lighting)
  • Check Engine Light Is On
  • Errors in other BCM related systems
  • Intermittent operation of electronic systems

Causes

  • Open or short circuit in the CAN bus
  • Poor contact in BCM connectors
  • Body control module malfunction
  • BCM power problems
  • Wiring corrosion

How to Fix

  1. Check the integrity of the low-speed CAN bus
  2. Inspect BCM connectors for oxidation or damage
  3. Check power supply and ground to BCM
  4. Scan other modules for related errors
  5. Replace the body control module if necessary

Related codes

U184BU184C

FAQ

What does the U184A code mean?

U184A is an OBD-II diagnostic trouble code that indicates: Lost Communication With Body Control Module On Low Speed CAN Bus

What causes a U184A error code?

The most common causes of U184A include: Open or short circuit in the CAN bus; Poor contact in BCM connectors; Body control module malfunction; BCM power problems.

How do I fix a U184A diagnostic trouble code?

To fix U184A: Check the integrity of the low-speed CAN bus. Inspect BCM connectors for oxidation or damage. Check power supply and ground to BCM. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U184A?

Yes, but get it checked soon

How much does it cost to fix U184A?

The estimated repair cost for U184A is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat