AutoCodes – Generic – P2523

P2523 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,425

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P2523?

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?

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 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 code?

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

Need Help with the Code?

Get the P2523 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2523 Chevrolet — A/C Request 'B' Circuit Low
P2523 Dodge — A/C Request 'B' Circuit Low
P2523 Ford — A/C Request 'B' Circuit Low
P2523 GMC — A/C Request 'B' Circuit Low
P2523 Mercedes-Benz — A/C Request 'B' Circuit Low

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 Code

What does the OBDII code P2523 mean?

P2523 indicates a low signal in the A/C Request 'B' Circuit, which typically relates to a malfunction in the air conditioning system's request signal.

What are common symptoms of the P2523 code?

Symptoms may include the air conditioning not working, reduced cooling efficiency, or an illuminated check engine light.

What causes the P2523 code?

Causes can include a faulty A/C request switch, wiring issues such as shorts or open circuits, or a malfunctioning control module.

How can I diagnose the P2523 code?

Start by inspecting the A/C request switch, wiring, and connectors for damage or corrosion. Use a multimeter to check circuit continuity and verify the signal output.

Is it safe to drive with the P2523 code?

Yes, it's generally safe to drive, but your air conditioning system may not function properly, which can be inconvenient in hot weather.

How do I fix the P2523 code?

Repairs may include replacing the A/C request switch, repairing damaged wiring, or resetting the control module if it’s the source of the fault.

Can a blown fuse cause the P2523 code?

Yes, a blown fuse related to the A/C system can lead to a low circuit signal and trigger this code.

Will clearing the code fix the problem?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn’t resolved, the code will likely return.

How much does it cost to repair the P2523 code?

Repair costs vary depending on the cause but typically range from $50 to $500, depending on whether the issue is wiring-related or requires replacing components.

Can a faulty control module trigger the P2523 code?

Yes, a malfunctioning control module can fail to process the A/C request signal correctly and cause this code.