OBD Guide
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B24D4

A/C Control Communication

B24D4 is an OBD-II diagnostic trouble code meaning: A/C Control Communication. Common causes: broken or damaged wiring harness, air conditioning control unit malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Air conditioner doesn't work
  • Unable to regulate temperature
  • Check Engine Light Is On

Causes

  • Broken or damaged wiring harness
  • Air conditioning control unit malfunction
  • Power problems (blown fuse)
  • Corroded contacts or poor connection
  • CAN bus fault

How to Fix

  1. Check the fuse associated with the air conditioner
  2. Inspect the wiring harness for damage
  3. Check the connection of the control unit connectors
  4. Test the air conditioner control unit
  5. If necessary, replace faulty components

Related codes

U1000U0100B24D3

FAQ

What does the B24D4 code mean?

B24D4 is an OBD-II diagnostic trouble code that indicates: A/C Control Communication

What causes a B24D4 error code?

The most common causes of B24D4 include: Broken or damaged wiring harness; Air conditioning control unit malfunction; Power problems (blown fuse); Corroded contacts or poor connection.

How do I fix a B24D4 diagnostic trouble code?

To fix B24D4: Check the fuse associated with the air conditioner. Inspect the wiring harness for damage. Check the connection of the control unit connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B24D4?

Limited driving only, diagnose soon

How much does it cost to fix B24D4?

The estimated repair cost for B24D4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat