AutoCodes – GMC – P2523 GMC

P2523 GMC Code - A/C Request 'B' Circuit Low

Quick Answer

The Powertrain Control Module (PCM) monitors the refrigerant pressure through the Air Condition (A/C) Pressure Sensor. Common causes include Low refrigerant, Too much refrigerant, Faulty Low Side Pressure Sensor. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P2523 GMC indicates A/C Request 'B' Circuit Low.
Common causes: Common causes include Low refrigerant, Too much refrigerant, Faulty Low Side Pressure Sensor.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,389

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2523 GMC Description

The Powertrain Control Module (PCM) monitors the refrigerant pressure through the Air Condition (A/C) Pressure Sensor. The PCM supplies a 5V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure causes the sensor signal to the PCM to vary. When the pressure is high, the signal is high. When the pressure is low, the signal is low. The PCM sets the OBII code when the signal from the sensor is out of factory specifications.

OBDII Code P2523 GMC - A/C Request 'B' Circuit Low - AutoCodes.com — P2523 GMC Code - A/C Request 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2523 GMC?

Low refrigerant
Too much refrigerant
Faulty Low Side Pressure Sensor
Low Side Pressure Sensor harness is open or shorted
Low Side Pressure Sensor circuit poor electrical connection

How to Fix the DTC P2523 GMC?

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 P2523 GMC 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 P2523 GMC code?

Need more information on how to fix the P2523 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P2523 GMC Code

1. What are the common symptoms of OBDII code P2523 in a GMC related to the A/C Request 'B' Circuit Low?

- Common symptoms include the air conditioning system not working properly, weak or no airflow from the vents, and the A/C compressor not engaging.

2. What are some possible causes of the A/C Request 'B' Circuit Low trouble code P2523 in a GMC?

- Potential causes may include a faulty A/C request sensor, damaged wiring or connectors in the A/C circuit, or a malfunctioning HVAC control module.

3. How can I diagnose the A/C Request 'B' Circuit Low issue if I have OBDII code P2523 in my GMC?

- To diagnose the problem, you can use a scan tool to check for the specific code, inspect the A/C request sensor and its wiring, and test the HVAC control module for proper function.

4. Can a DIY enthusiast repair the A/C Request 'B' Circuit Low problem associated with OBDII code P2523 in a GMC?

- Depending on your skills and experience, you may be able to repair the issue by replacing the faulty A/C request sensor, repairing damaged wiring, or resetting the HVAC control module.

5. Is it safe to continue driving my GMC with the A/C Request 'B' Circuit Low trouble code P2523 present?

- While driving with this code may not cause immediate harm to your vehicle, it is recommended to address the issue promptly to prevent further damage to the A/C system or related components.

6. Will resetting the OBDII code P2523 related to the A/C Request 'B' Circuit Low in my GMC solve the problem?

- Resetting the code may temporarily clear the error, but unless the underlying issue is fixed, the code is likely to reappear once the system detects the problem again.

7. How can I prevent the A/C Request 'B' Circuit Low trouble code P2523 from reoccurring in my GMC?

- Regular maintenance of the A/C system, checking for loose connections or damaged wiring, and addressing any issues promptly can help prevent the code from reoccurring.

8. What is the typical cost to repair the A/C Request 'B' Circuit Low problem associated with OBDII code P2523 in a GMC?

- Repair costs can vary based on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic fees, potentially ranging from $100 to $500 or more.

9. Can extreme weather conditions affect the occurrence of the A/C Request 'B' Circuit Low trouble code P2523 in a GMC?

- Extreme weather conditions, such as high heat or humidity, can sometimes exacerbate A/C system issues, leading to the triggering of codes like P2523 due to added strain on the components.

10. Should I consult a professional mechanic if I encounter the OBDII code P2523 related to the A/C Request 'B' Circuit Low in my GMC?

- If you are unsure about diagnosing or repairing the issue yourself, it is advisable to seek the expertise of a qualified mechanic to properly address the A/C system problem and clear the trouble code.