AutoCodes – Mercedes-Benz – P2519 Mercedes-Benz

P2519 Mercedes-Benz Code - A/C Request 'A' 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: P2519 Mercedes-Benz indicates A/C Request 'A' 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 3,748

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 P2519 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 P2519 Mercedes-Benz - A/C Request 'A' Circuit - AutoCodes.com — P2519 Mercedes-Benz Code - A/C Request 'A' Circuit

What does this mean?

What are the Possible Causes of the DTC P2519 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 P2519 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 P2519 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 P2519 Mercedes-Benz code?

Need more information on how to fix the P2519 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2519 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 P2519 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P2519 in a Mercedes-Benz related to the A/C Request 'A' Circuit?

The common symptoms include the air conditioning system not functioning properly, the A/C compressor not engaging, and the inability to adjust the interior temperature.

2. What are the possible causes of OBDII code P2519 in a Mercedes-Benz?

Possible causes include a faulty A/C compressor, issues with the A/C compressor relay, damaged wiring or connectors in the A/C circuit, or a malfunctioning A/C control module.

3. How can I diagnose the A/C Request 'A' Circuit issue triggering OBDII code P2519 in my Mercedes-Benz?

You can diagnose the issue by using a diagnostic scanner to retrieve the trouble code, inspecting the A/C compressor and related components for damage, and testing the A/C circuit for continuity and proper voltage.

4. Can I continue to drive my Mercedes-Benz with OBDII code P2519 related to the A/C Request 'A' Circuit?

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

5. How can I repair OBDII code P2519 in my Mercedes-Benz related to the A/C Request 'A' Circuit?

To repair the issue, you may need to replace the faulty A/C compressor, repair damaged wiring or connectors, replace the A/C compressor relay, or reprogram the A/C control module if necessary.

6. Are there any DIY tips for troubleshooting OBDII code P2519 in a Mercedes-Benz A/C system?

While basic inspections and checks can be done by DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing complex A/C system issues like the A/C Request 'A' Circuit problem triggering code P2519.

7. How much can I expect to pay for repairing OBDII code P2519 in my Mercedes-Benz related to the A/C Request 'A' Circuit?

The cost of repair can vary depending on the specific cause of the issue, but it may involve parts and labor expenses ranging from a few hundred to over a thousand dollars.

8. Can a Mercedes-Benz dealership or authorized service center help me with resolving OBDII code P2519 related to the A/C Request 'A' Circuit?

Yes, Mercedes-Benz dealerships or authorized service centers have the expertise, specialized equipment, and genuine parts to diagnose and repair A/C system issues like the one indicated by code P2519.

9. Will resetting the OBDII system clear code P2519 related to the A/C Request 'A' Circuit in my Mercedes-Benz?

Simply resetting the OBDII system may temporarily clear the code, but it is crucial to address the underlying issue causing the code to prevent it from reoccurring.

10. Is OBDII code P2519 in a Mercedes-Benz a common issue with the A/C Request 'A' Circuit?

While not as common as some other OBDII codes, issues related to the A/C Request 'A' Circuit can occur in Mercedes-Benz vehicles, particularly in older models or those with high mileage.