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Engine-Codes – Generic – P2518

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

Quick Answer

The P2518 diagnostic trouble code (DTC) indicates that there is a high voltage condition in the circuit for the air conditioning refrigerant pressure sensor 'B'. Common causes include Faulty air conditioning refrigerant pressure sensor 'B', Damaged wiring or connectors in the circuit, ECM software or hardware issues. 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 indicates Air Condition Refrigerant Pressure Sensor 'B' Circuit High.
Common causes
Common causes include Faulty air conditioning refrigerant pressure sensor 'B', Damaged wiring or connectors in the circuit, ECM software or hardware issues.
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 14, 2024
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Code P2518 Description

The P2518 diagnostic trouble code (DTC) indicates that there is a high voltage condition in the circuit for the air conditioning refrigerant pressure sensor 'B'. This sensor is responsible for monitoring the pressure of the refrigerant in the air conditioning system. When the voltage in the circuit is too high, it can lead to incorrect readings being sent to the engine control module (ECM), which can affect the performance of the air conditioning system.

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

Common Causes of P2518

  1. Faulty air conditioning refrigerant pressure sensor 'B'.
  2. Damaged wiring or connectors in the circuit.
  3. ECM software or hardware issues.
  4. Low refrigerant levels in the air conditioning system.
  5. Electrical issues such as a short circuit or corrosion in the wiring.

Symptoms of P2518

  1. Inefficient cooling or lack of cooling from the air conditioning system.
  2. The air conditioning compressor may not engage or may cycle on and off frequently.
  3. The air conditioning system may blow warm air instead of cold air.
  4. The check engine light may illuminate on the dashboard.
  5. Reduced fuel efficiency due to the air conditioning system working harder to cool the vehicle.

How to Fix P2518

  1. Begin by using a scan tool to diagnose the specific cause of the high voltage condition in the air conditioning refrigerant pressure sensor 'B' circuit.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Test the air conditioning refrigerant pressure sensor 'B' using a multimeter to determine if it is functioning correctly. Replace if faulty.
  4. Clear the DTC and reset the ECM to see if the issue has been resolved.
  5. Test the air conditioning system to ensure proper operation and refrigerant pressure readings.

Cost to Fix P2518

The cost of repairing a P2518 DTC can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty air conditioning refrigerant pressure sensor 'B' can range from $100 to $200, including parts and labor. However, if the issue is related to wiring or ECM problems, the cost may be higher. It's recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

What does this mean?

Tech Notes for P2518

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 code?

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Code P2518 Information for Specific Makes

  • P2518 Buick — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Cadillac — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Chevrolet — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Chrysler — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Dodge — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Ford — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 GMC — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
  • P2518 Mercedes-Benz — Air Condition Refrigerant Pressure Sensor 'B' Circuit High
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.

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