AutoCodes – Mercedes-Benz – P255F Mercedes-Benz

P255F Mercedes-Benz Code - A/C Request 'A' Circuit Range/Performance

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: P255F Mercedes-Benz indicates A/C Request 'A' Circuit Range/Performance.
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 1,454

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 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P255F 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 P255F Mercedes-Benz - A/C Request 'A' Circuit Range/Performance - AutoCodes.com — P255F Mercedes-Benz Code - A/C Request 'A' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P255F 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 P255F 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 P255F 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 P255F Mercedes-Benz code?

Need more information on how to fix the P255F Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P255F 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 P255F Mercedes-Benz Code

1. What are common symptoms of OBDII code P255F in a Mercedes-Benz related to the A/C Request 'A' Circuit Range/Performance?

- Common symptoms include the A/C system not working properly, lack of cold air from the vents, and potential issues with climate control functions.

2. What are possible causes of the OBDII code P255F in a Mercedes-Benz?

- Possible causes may include a faulty A/C compressor, damaged wiring or connectors in the A/C system, low refrigerant levels, or a malfunctioning A/C pressure sensor.

3. How can I diagnose the OBDII code P255F in my Mercedes-Benz related to the A/C Request 'A' Circuit Range/Performance?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the A/C system components, checking for loose connections, and testing the A/C compressor and pressure sensor.

4. Can I continue driving my Mercedes-Benz with the OBDII code P255F triggered?

- It is not recommended to drive with the code triggered, as it indicates a potential issue with the A/C system that could lead to further damage or discomfort while driving.

5. How can I reset the OBDII code P255F in my Mercedes-Benz after making repairs?

- After addressing the underlying issue causing the code, you can reset it using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the fault code.

6. Are there any DIY repair tips for fixing the OBDII code P255F in a Mercedes-Benz?

- DIY repair tips may include checking for visible damage to A/C system components, ensuring proper refrigerant levels, and inspecting wiring for any signs of wear or corrosion.

7. Is it necessary to visit a dealership or mechanic to fix the OBDII code P255F in a Mercedes-Benz?

- While professional help may be needed for complex repairs, some simple fixes like checking and refilling refrigerant levels or replacing a faulty compressor can be done by DIY enthusiasts.

8. Can weather or climate conditions affect the triggering of the OBDII code P255F in a Mercedes-Benz?

- Extreme weather conditions, such as very high or low temperatures, can potentially impact the A/C system's performance and trigger the code due to increased stress on the components.

9. How much does it typically cost to repair the OBDII code P255F related to the A/C Request 'A' Circuit Range/Performance in a Mercedes-Benz?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a few thousand dollars, especially if major components need replacement.

10. Are there any recalls or service bulletins related to the OBDII code P255F in Mercedes-Benz vehicles?

- It's always a good idea to check with Mercedes-Benz dealerships or the manufacturer's website for any recalls or service bulletins related to this specific OBDII code to see if there are known issues or solutions available.