AutoCodes – Generic – B24D4

B24D4 Code - A/C Control Communication

Quick Answer

When A/C Auto Amplifier is not transmitting or receiving a communication signal for 2 or more seconds the Diagnostic Trouble Code (DTC) is set. Common causes include Faulty A/C Switch, A/C Switch harness is open or shorted, A/C Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B24D4 indicates A/C Control Communication.
Common causes: Common causes include Faulty A/C Switch, A/C Switch harness is open or shorted, A/C Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,873

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B24D4 Description

When A/C Auto Amplifier is not transmitting or receiving a communication signal for 2 or more seconds the Diagnostic Trouble Code (DTC) is set.

OBDII Code B24D4 - A/C Control Communication - AutoCodes.com — B24D4 Code - A/C Control Communication

What does this mean?

What are the Possible Causes of the DTC B24D4?

Faulty A/C Switch
A/C Switch harness is open or shorted
A/C Switch circuit poor electrical connection
Faulty A/C Auto Amplifier

How to Fix the DTC B24D4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B24D4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B24D4 code?

Need more information on how to fix the B24D4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B24D4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B24D4 Infiniti — A/C Control Communication
B24D4 Nissan — A/C Control Communication

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B24D4 Code

1. What does the OBDII code B24D4 mean?

The B24D4 code indicates an issue with the communication between the A/C control module and other components in the HVAC system.

2. What are the common symptoms of the B24D4 code?

Symptoms may include the air conditioning not working, inconsistent cabin temperature, or the A/C control panel being unresponsive.

3. What causes the B24D4 code to appear?

Common causes include a faulty A/C control module, damaged wiring or connectors, or software issues affecting communication between system components.

4. Can I still drive with the B24D4 code active?

Yes, but the A/C system may not function properly, which could lead to discomfort in extreme weather conditions.

5. How do I diagnose the B24D4 code?

Diagnose the code by scanning the vehicle with an OBDII scanner, inspecting the wiring and connectors for damage, and testing the A/C control module for faults.

6. What repairs are needed to fix the B24D4 code?

Repairs may include replacing the A/C control module, repairing or replacing damaged wiring or connectors, or updating the moduleâ€™s software.

7. Is it expensive to fix the B24D4 code?

Repair costs depend on the issue, ranging from minimal expenses for wiring repairs to more significant costs for replacing the A/C control module.

8. Can a weak battery cause the B24D4 code?

Yes, a weak or failing battery can cause communication issues between modules, potentially triggering the code.

9. Does clearing the code fix the problem?

Clearing the code may temporarily reset the system, but the underlying issue must be addressed to prevent the code from returning.

10. Should I take my car to a mechanic for the B24D4 code?

If youâ€™re not experienced with electrical diagnostics, itâ€™s recommended to consult a qualified mechanic to properly diagnose and repair the issue.