AutoCodes – Mercedes-Benz – P2523 Mercedes-Benz

P2523 Mercedes-Benz 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 Mercedes-Benz 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 1,957

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

What does this mean?

What are the Possible Causes of the DTC P2523 Mercedes-Benz?

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 Mercedes-Benz?

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 Mercedes-Benz 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 Mercedes-Benz code?

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

Need Help with the Code?

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

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 Mercedes-Benz Code

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

- Common symptoms include a malfunctioning air conditioning system, lack of cool air from the vents, and potential issues with the climate control system.

2. What are the possible causes of the A/C Request 'B' Circuit Low trouble code (P2523) in a Mercedes-Benz?

- Possible causes include a faulty A/C compressor, damaged wiring or connectors in the A/C system, a malfunctioning A/C pressure sensor, or issues with the climate control module.

3. How can I diagnose the A/C Request 'B' Circuit Low issue in my Mercedes-Benz?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble code P2523, inspecting the A/C system components, checking the wiring for any visible damage, and testing the A/C pressure sensor.

4. Can I continue driving my Mercedes-Benz with the P2523 code related to the A/C Request 'B' Circuit Low?

- It is not recommended to drive with this code present, as it can lead to further damage to the A/C system and potentially affect the overall performance of your vehicle.

5. How can I repair the A/C Request 'B' Circuit Low issue in my Mercedes-Benz?

- Repair options may include replacing the faulty A/C compressor, repairing or replacing damaged wiring or connectors, troubleshooting and fixing issues with the A/C pressure sensor, or addressing any problems with the climate control module.

6. Are there any DIY tips for fixing the P2523 trouble code in a Mercedes-Benz?

- DIY tips may include checking and cleaning electrical connections, inspecting the A/C system components for visible damage, and ensuring proper refrigerant levels in the system.

7. How much does it cost to repair the A/C Request 'B' Circuit Low issue in a Mercedes-Benz?

- The cost of repairs can vary depending on the specific cause of the issue, the extent of the damage, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic.

8. Can a regular car owner reset the P2523 trouble code in a Mercedes-Benz?

- While a regular car owner can reset the trouble code using an OBDII scanner, it is important to diagnose and address the root cause of the issue to prevent the code from reoccurring.

9. Is the A/C Request 'B' Circuit Low code a common problem in Mercedes-Benz vehicles?

- The P2523 code related to the A/C Request 'B' Circuit Low may occur in Mercedes-Benz vehicles, especially in models with aging A/C components or electrical system issues.

10. How long does it typically take to repair the A/C Request 'B' Circuit Low issue in a Mercedes-Benz?

- The repair time can vary depending on the specific cause of the problem, the availability of parts, and whether you choose to perform the repairs yourself or seek assistance from a professional technician.