AutoCodes – Generic – B24B4

B24B4 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: B24B4 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 1,758

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 B24B4 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 B24B4 - A/C Control Communication - AutoCodes.com — B24B4 Code - A/C Control Communication

What does this mean?

What are the Possible Causes of the DTC B24B4?

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 B24B4?

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 B24B4 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 B24B4 code?

Need more information on how to fix the B24B4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B24B4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B24B4 Infiniti — A/C Control Communication
B24B4 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 B24B4 Code

1. What are common symptoms of OBDII code B24B4 (A/C Control Communication)?

- Common symptoms include malfunctioning air conditioning system, inconsistent cooling, and issues with climate control settings.

2. What are potential causes of OBDII code B24B4 (A/C Control Communication)?

- Possible causes include faulty A/C control module, wiring issues, communication errors between modules, or a malfunctioning climate control system.

3. How can I diagnose OBDII code B24B4 (A/C Control Communication)?

- Diagnose the code by using a professional OBDII scanner to retrieve the specific error code, check the wiring connections, and test the A/C control module for functionality.

4. Can OBDII code B24B4 (A/C Control Communication) be fixed without professional help?

- While some simple wiring issues may be resolved by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair of complex A/C control communication problems.

5. Are there any quick repair tips for fixing OBDII code B24B4 (A/C Control Communication)?

- Quick repair tips include checking and securing wiring connections, resetting the A/C control module, and ensuring proper communication between the A/C and other control modules.

6. How serious is OBDII code B24B4 (A/C Control Communication)?

- This code can affect the functionality of the air conditioning system, leading to discomfort while driving. Addressing the issue promptly is recommended to avoid further complications.

7. Can OBDII code B24B4 (A/C Control Communication) cause damage to other vehicle components?

- If left unresolved, this code may cause strain on the A/C system components, potentially leading to further damage or costly repairs if not addressed in a timely manner.

8. Is it safe to drive with OBDII code B24B4 (A/C Control Communication) present?

- While it may be safe to drive with this code in the short term, it is not recommended as it can affect the overall comfort and functionality of the air conditioning system, especially in extreme weather conditions.

9. How much does it typically cost to repair OBDII code B24B4 (A/C Control Communication)?

- Repair costs for this code can vary depending on the root cause of the issue, but it is advisable to budget for diagnostic fees, parts replacement, and labor costs which can range from moderate to expensive.

10. Can resetting the OBDII system clear the B24B4 code (A/C Control Communication)?

- Resetting the OBDII system may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.