OBD Guide
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B24B4

A/C Control Communication

B24B4 is an OBD-II diagnostic trouble code meaning: A/C Control Communication. Common causes: open/short circuit in wiring harness, oxidation of connector contacts. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Air conditioner not working
  • Lack of response to climate control buttons
  • Climate system display freezes
  • Flashing indicators on the panel

Causes

  • Open/short circuit in wiring harness
  • Oxidation of connector contacts
  • Climate control module failure
  • Software glitch
  • Blown power fuse

How to Fix

  1. Read current fault codes using a scanner
  2. Check the condition of fuses and relays
  3. Inspect the wiring harness and connectors for damage.
  4. Check power and ground on climate module
  5. If necessary, replace the faulty module

Related codes

U1000U1020B24B0

FAQ

What does the B24B4 code mean?

B24B4 is an OBD-II diagnostic trouble code that indicates: A/C Control Communication

What causes a B24B4 error code?

The most common causes of B24B4 include: Open/short circuit in wiring harness; Oxidation of connector contacts; Climate control module failure; Software glitch.

How do I fix a B24B4 diagnostic trouble code?

To fix B24B4: Read current fault codes using a scanner. Check the condition of fuses and relays. Inspect the wiring harness and connectors for damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B24B4?

Yes, but get it checked soon

How much does it cost to fix B24B4?

The estimated repair cost for B24B4 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat