AutoCodes – Generic – B2539

B2539 Code - Aux A/C Mode Position Reference Circuit Short To Ground

Quick Answer

The Body Control Module (BCM) monitors the Aux A/C Mode Position Reference Circuit. Common causes include Faulty Aux A/C Mode Actuator, Aux A/C Mode Actuator harness is open or shorted, Aux A/C Mode Actuator 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: B2539 indicates Aux A/C Mode Position Reference Circuit Short To Ground.
Common causes: Common causes include Faulty Aux A/C Mode Actuator, Aux A/C Mode Actuator harness is open or shorted, Aux A/C Mode Actuator 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 3,652

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 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2539 Description

The Body Control Module (BCM) monitors the Aux A/C Mode Position Reference Circuit. The BCM sets the OBDII code when the Aux A/C Mode Position Reference Circuit is not to factory specifications.

OBDII Code B2539 - Aux A/C Mode Position Reference Circuit Short To Ground - AutoCodes.com — B2539 Code - Aux A/C Mode Position Reference Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2539?

Faulty Aux A/C Mode Actuator
Aux A/C Mode Actuator harness is open or shorted
Aux A/C Mode Actuator circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2539?

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 B2539 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 B2539 code?

Need more information on how to fix the B2539 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2539 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2539 Chrysler — Convertible Top Header Latch/Unlatch Limit Switch Correlation
B2539 Dodge — Convertible Top Header Latch/Unlatch Limit Switch Correlation
B2539 Lexus — Abnormal Roof Drive Motor Left Pulse

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 B2539 Code

1. What are common symptoms of OBDII code B2539 (Aux A/C Mode Position Reference Circuit Short To Ground)?

The common symptoms include inoperative auxiliary air conditioning systems, lack of air conditioning control, and potential issues with climate control.

2. What causes OBDII code B2539 to trigger?

This code is typically triggered by a short circuit to ground in the auxiliary air conditioning mode position reference circuit.

3. How can I diagnose the issue related to code B2539?

You can diagnose the issue by inspecting the wiring harness for any visible damage, testing the circuit for continuity and shorts, and checking the connections to the auxiliary air conditioning components.

4. What are some repair tips for resolving OBDII code B2539?

Repair tips include repairing any damaged wiring, replacing faulty components in the auxiliary air conditioning system, and ensuring proper connections and grounds.

5. Can OBDII code B2539 be a safety concern?

While this code may not directly pose a safety concern, it can affect the functionality of the auxiliary air conditioning system, which may impact comfort and convenience while driving.

6. Is it possible to clear OBDII code B2539 without fixing the issue?

Clearing the code without addressing the underlying issue will likely result in the code reappearing once the fault is detected again during system checks.

7. How critical is it to address OBDII code B2539 promptly?

It is advisable to address this code promptly to avoid further issues with the auxiliary air conditioning system and to ensure proper climate control functionality.

8. Can a DIY enthusiast fix OBDII code B2539 at home?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address this code by following diagnostic procedures and making necessary repairs to the circuit.

9. Is it recommended to seek professional help for OBDII code B2539?

If you are unsure about diagnosing or repairing electrical issues, it is recommended to seek professional help to accurately address OBDII code B2539.

10. What is the typical cost of repairing OBDII code B2539?

The cost of repairing this code can vary depending on the extent of the damage, parts needed for replacement, and labor charges, so it is best to obtain estimates from automotive professionals.