AutoCodes – GMC – P2520 GMC

P2520 GMC Code - A/C Request 'A' 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: P2520 GMC indicates A/C Request 'A' 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 1,145

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 P2520 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 P2520 GMC - A/C Request 'A' Circuit Low - AutoCodes.com — P2520 GMC Code - A/C Request 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2520 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 P2520 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 P2520 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 P2520 GMC code?

Need more information on how to fix the P2520 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 P2520 GMC Code

1. What are the common symptoms of OBDII code P2520 GMC (A/C Request 'A' Circuit Low)?

The common symptoms of this code may include the air conditioning system not functioning properly, the A/C compressor not engaging, and the A/C light flashing on the dashboard.

2. What are the possible causes of OBDII code P2520 GMC?

Possible causes of this code can include a faulty A/C request sensor, a short circuit in the A/C request 'A' circuit, damaged wiring or connectors in the A/C system, or a malfunctioning A/C control module.

3. How can I diagnose OBDII code P2520 GMC?

Diagnosing this code typically involves using a scan tool to read the code and check for any related freeze frame data. Additionally, a visual inspection of the A/C system components and testing the A/C request sensor and circuit can help pinpoint the issue.

4. Can I drive my vehicle with OBDII code P2520 GMC active?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential damage to the A/C system and ensure optimal comfort while driving.

5. How can I repair OBDII code P2520 GMC?

Repairing this code may involve replacing the faulty A/C request sensor, repairing any damaged wiring or connectors in the A/C system, or reprogramming the A/C control module if needed.

6. Are there any DIY tips for fixing OBDII code P2520 GMC?

While some simple checks like inspecting for loose connections or damaged wires can be done by DIY enthusiasts, diagnosing and repairing this code may require professional tools and expertise to ensure an accurate fix.

7. How much does it cost to repair OBDII code P2520 GMC at a mechanic?

The cost of repairing this code can vary depending on the exact cause of the issue, the labor rates of the mechanic, and the cost of any replacement parts needed. It is advisable to obtain quotes from different mechanics for an accurate estimate.

8. Will resetting the OBDII code P2520 GMC make it go away permanently?

Resetting the code may temporarily clear it, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the problem to prevent the code from coming back.

9. Can extreme weather conditions trigger OBDII code P2520 GMC?

Extreme weather conditions, such as very high or low temperatures, can potentially affect the operation of the A/C system and lead to issues that trigger this code. Ensuring proper maintenance of the A/C system can help prevent such issues.

10. Is OBDII code P2520 GMC specific to GMC vehicles only?

While this specific code may be associated with GMC vehicles, similar codes related to the A/C system can be found in other vehicle makes and models, each with their own unique diagnostic procedures and repair methods.