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P2518 Mercedes-Benz Code - Air Condition Refrigerant Pressure Sensor 'B' Circuit High

Quick Answer

The P2518 diagnostic trouble code (DTC) in Mercedes-Benz vehicles specifically refers to the Air Condition Refrigerant Pressure Sensor 'B' Circuit High. Common causes include Faulty refrigerant pressure sensor: The sensor itself may be malfunctioning, sending incorrect signals to the ECM, Wiring issues: Damaged or corroded wiring in the sensor circuit can cause high voltage readings and trigger the P2518 code, ECM malfunction: Problems with the engine control module that receives and processes sensor data can lead to erroneous readings and trigger the code. 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
P2518 Mercedes-Benz indicates Air Condition Refrigerant Pressure Sensor 'B' Circuit High.
Common causes
Common causes include Faulty refrigerant pressure sensor: The sensor itself may be malfunctioning, sending incorrect signals to the ECM, Wiring issues: Damaged or corroded wiring in the sensor circuit can cause high voltage readings and trigger the P2518 code, ECM malfunction: Problems with the engine control module that receives and processes sensor data can lead to erroneous readings and trigger the code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P2518 Mercedes-Benz Description

The P2518 diagnostic trouble code (DTC) in Mercedes-Benz vehicles specifically refers to the Air Condition Refrigerant Pressure Sensor 'B' Circuit High. This code indicates that there is an issue with the circuit that controls the air conditioning refrigerant pressure sensor. The refrigerant pressure sensor plays a crucial role in monitoring the pressure of the refrigerant in the air conditioning system. This information is essential for the system to function properly and regulate the temperature inside the vehicle.

OBDII Code P2518 Mercedes-Benz - Air Condition Refrigerant Pressure Sensor 'B' Circuit High
P2518 Mercedes-Benz Code - Air Condition Refrigerant Pressure Sensor 'B' Circuit High

Common Causes of P2518 Mercedes-Benz

  1. Faulty refrigerant pressure sensor: The sensor itself may be malfunctioning, sending incorrect signals to the ECM.
  2. Wiring issues: Damaged or corroded wiring in the sensor circuit can cause high voltage readings and trigger the P2518 code.
  3. ECM malfunction: Problems with the engine control module that receives and processes sensor data can lead to erroneous readings and trigger the code.
  4. Refrigerant overcharge: Excessive refrigerant in the system can cause high pressure readings and trigger the code.
  5. System leaks: Refrigerant leaks in the air conditioning system can also result in high pressure levels and trigger the P2518 code.

Symptoms of P2518 Mercedes-Benz

  1. Poor cooling performance: The air conditioning system may struggle to cool the interior of the vehicle effectively, leading to discomfort for the occupants.
  2. Inconsistent temperature control: The temperature settings may not be accurately maintained, resulting in fluctuations in cabin temperature.
  3. AC compressor cycling excessively: The compressor may turn on and off more frequently than usual, indicating a problem with refrigerant pressure regulation.
  4. AC system not engaging: The air conditioning system may fail to engage or produce cold air altogether, indicating a more severe issue with the refrigerant pressure sensor.

How to Fix P2518 Mercedes-Benz

  1. Diagnostic scan: Use a diagnostic scanner to retrieve the P2518 code and verify the issue with the air conditioning refrigerant pressure sensor.
  2. Inspect sensor and wiring: Check the sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary and repair any damaged wiring.
  3. Test ECM: Verify the functionality of the engine control module by checking for any fault codes or malfunctions that may be causing the high voltage readings.
  4. Refrigerant pressure test: Conduct a pressure test on the air conditioning system to ensure that the refrigerant levels are within the optimal range.
  5. Clear codes and test system: Clear the P2518 code from the ECM memory after completing repairs and test the air conditioning system to ensure proper operation.

Cost to Fix P2518 Mercedes-Benz

The cost of repairing the P2518 code in a Mercedes-Benz vehicle can vary depending on the specific underlying cause of the issue. On average, the cost of replacing a faulty refrigerant pressure sensor can range from $100 to $300, including parts and labor. However, if wiring repairs or ECM replacement are necessary, the total repair cost can increase significantly.

What does this mean?

Tech Notes for P2518 Mercedes-Benz

Do not just add more refrigerant, use an A/C machine to evacuate the refrigerant and charge the correct amount.

When is the Code Detected?

The Powertrain Control Module (PCM) sets the code when detects a short to voltage at the A/C low side pressure sensor signal circuit.

Need more information about the P2518 Mercedes-Benz code?

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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 P2518 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P2518 in a Mercedes-Benz related to the air condition refrigerant pressure sensor circuit?

The common symptoms include malfunctioning air conditioning system, reduced cooling performance, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P2518 in a Mercedes-Benz indicating a high circuit voltage for the air condition refrigerant pressure sensor?

Possible causes include a faulty refrigerant pressure sensor, wiring issues in the sensor circuit, low refrigerant level, or a problem with the air conditioning compressor.

3. How can I diagnose the OBDII code P2518 in my Mercedes-Benz related to the air condition refrigerant pressure sensor circuit?

Diagnosis involves using a scan tool to check for the specific fault code, testing the refrigerant pressure sensor, inspecting the wiring for any damage, and verifying the refrigerant level in the system.

4. Can I continue driving my Mercedes-Benz with the OBDII code P2518 indicating a high circuit voltage for the air condition refrigerant pressure sensor?

It is not recommended to drive your vehicle with this code as it can lead to poor air conditioning performance and potential damage to the air conditioning system components.

5. How can I repair OBDII code P2518 in my Mercedes-Benz caused by a high circuit voltage in the air condition refrigerant pressure sensor?

Repair involves replacing the faulty refrigerant pressure sensor, repairing any damaged wiring, ensuring the proper refrigerant level, and resetting the fault code using a scan tool.

6. Are there any DIY tips for troubleshooting OBDII code P2518 in a Mercedes-Benz related to the air condition refrigerant pressure sensor?

While basic checks like inspecting the sensor wiring connections can be done, it is recommended to seek professional help for accurate diagnosis and repair of this code.

7. What is the significance of the air condition refrigerant pressure sensor in a Mercedes-Benz triggering the OBDII code P2518?

The sensor plays a crucial role in monitoring the refrigerant pressure in the air conditioning system, helping maintain optimal cooling performance and ensuring system efficiency.

8. Can a faulty air condition refrigerant pressure sensor cause other issues in a Mercedes-Benz besides triggering the OBDII code P2518?

Yes, a faulty sensor can lead to reduced cooling efficiency, improper climate control operation, and potential damage to other air conditioning components if not addressed promptly.

9. How long does it typically take to repair OBDII code P2518 in a Mercedes-Benz caused by a high circuit voltage for the air condition refrigerant pressure sensor?

The repair time can vary depending on the exact cause of the issue, but it usually takes a few hours to diagnose, replace the sensor if needed, and reset the fault code.

10. Is it possible for OBDII code P2518 to reoccur in a Mercedes-Benz after the initial repair of the air condition refrigerant pressure sensor circuit issue?

If the root cause of the high circuit voltage is not properly addressed during the repair, there is a possibility of the code reoccurring. It is essential to ensure a thorough diagnosis and repair to prevent this.

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