AutoCodes – GMC – P2522 GMC

P2522 GMC Code - A/C Request 'B' Circuit

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: P2522 GMC indicates A/C Request 'B' Circuit.
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 1,002

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 P2522 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 P2522 GMC - A/C Request 'B' Circuit - AutoCodes.com — P2522 GMC Code - A/C Request 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P2522 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 P2522 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 P2522 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 P2522 GMC code?

Need more information on how to fix the P2522 GMC code? Get Access to Factory Service Manuals

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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 P2522 GMC Code

1. What are the common symptoms of OBDII code P2522 GMC (A/C Request 'B' Circuit)?

- Common symptoms include the air conditioning system not working properly, lack of cool air from the vents, and the A/C compressor not engaging.

2. What are the possible causes of the A/C Request 'B' Circuit code P2522 in a GMC vehicle?

- Possible causes include a faulty A/C compressor clutch relay, wiring issues in the A/C system, a defective A/C control module, or a malfunctioning A/C pressure sensor.

3. How can I diagnose OBDII code P2522 related to the A/C Request 'B' Circuit in my GMC vehicle?

- Diagnose the code by checking the A/C compressor clutch relay for proper operation, inspecting the wiring for any damage or loose connections, testing the A/C control module, and verifying the A/C pressure sensor's functionality.

4. Is it safe to continue driving with OBDII code P2522 GMC (A/C Request 'B' Circuit) present?

- While driving with the code may not pose an immediate safety risk, it is recommended to address the issue promptly to avoid further damage to the A/C system.

5. Can I repair OBDII code P2522 GMC (A/C Request 'B' Circuit) on my own?

- Depending on your automotive repair skills, you may be able to address the issue yourself by inspecting the components mentioned earlier and replacing any faulty parts.

6. How much does it typically cost to repair OBDII code P2522 related to the A/C Request 'B' Circuit in a GMC vehicle?

- The cost of repairs can vary based on the specific cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or take it to a professional mechanic.

7. Are there any common DIY repair tips for fixing OBDII code P2522 GMC (A/C Request 'B' Circuit)?

- DIY repair tips may include checking and cleaning electrical connections, testing the A/C compressor clutch relay, and ensuring proper refrigerant levels in the A/C system.

8. What role does the A/C control module play in triggering OBDII code P2522 (A/C Request 'B' Circuit)?

- The A/C control module is responsible for sending signals to engage the A/C compressor clutch based on input from various sensors, and a malfunction in this module can lead to the P2522 trouble code.

9. Can weather conditions affect the occurrence of OBDII code P2522 GMC (A/C Request 'B' Circuit)?

- Extreme weather conditions, such as high temperatures, can put additional strain on the A/C system and potentially trigger issues related to the A/C Request 'B' Circuit.

10. How urgent is it to address OBDII code P2522 GMC (A/C Request 'B' Circuit) once it appears on the vehicle's diagnostic system?

- It is advisable to address the code as soon as possible to prevent further damage to the A/C system and ensure comfort while driving, especially in hot weather.