OBD Guide
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U184B

Lost Communication With Remote Heater And Air Conditioning Control Module On Low Speed CAN Bus

U184B is an OBD-II diagnostic trouble code meaning: Lost Communication With Remote Heater And Air Conditioning Control Module On Low Speed CAN Bus. Common causes: climate control module malfunction, open or short circuit in the can bus wiring. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • The climate system (heating/air conditioning) does not work
  • The climate control display shows errors or no indication
  • The heater fan does not turn on or does not work correctly
  • Other systems connected to the same CAN bus may operate intermittently

Causes

  • Climate control module malfunction
  • Open or short circuit in the CAN bus wiring
  • Poor contact in climate control module connectors
  • Problems with power supply to the climate control module
  • Malfunction of other modules connected to the same CAN bus

How to Fix

  1. Check fuses associated with the climate control system
  2. Inspect the climate control module connectors and wiring for damage.
  3. Check the supply voltage on the climate control module
  4. Scan other modules for CAN bus errors
  5. If necessary, replace the climate control module

Related codes

U184AU184CU184D

FAQ

What does the U184B code mean?

U184B is an OBD-II diagnostic trouble code that indicates: Lost Communication With Remote Heater And Air Conditioning Control Module On Low Speed CAN Bus

What causes a U184B error code?

The most common causes of U184B include: Climate control module malfunction; Open or short circuit in the CAN bus wiring; Poor contact in climate control module connectors; Problems with power supply to the climate control module.

How do I fix a U184B diagnostic trouble code?

To fix U184B: Check fuses associated with the climate control system. Inspect the climate control module connectors and wiring for damage.. Check the supply voltage on the climate control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U184B?

Yes, but get it checked soon

How much does it cost to fix U184B?

The estimated repair cost for U184B is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat