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Engine-Codes – GMC – P2518 GMC

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

Quick Answer

The P2518 GMC diagnostic trouble code indicates that there is a high voltage condition in the circuit of the air conditioning refrigerant pressure sensor 'B'. Common causes include Faulty air conditioning refrigerant pressure sensor 'B', Wiring or connector issues in the circuit, Low refrigerant levels in the air conditioning system. 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 GMC indicates Air Condition Refrigerant Pressure Sensor 'B' Circuit High.
Common causes
Common causes include Faulty air conditioning refrigerant pressure sensor 'B', Wiring or connector issues in the circuit, Low refrigerant levels in the air conditioning system.
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 09, 2024
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Code P2518 GMC Description

The P2518 GMC diagnostic trouble code indicates that there is a high voltage condition in the circuit of 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 higher than normal, it can lead to incorrect readings and potentially affect the performance of the air conditioning system in the vehicle.

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

Common Causes of P2518 GMC

  1. Faulty air conditioning refrigerant pressure sensor 'B'
  2. Wiring or connector issues in the circuit
  3. Low refrigerant levels in the air conditioning system
  4. Malfunctioning air conditioning compressor
  5. Issues with the air conditioning control module

Symptoms of P2518 GMC

  1. Lack of cold air coming from the air conditioning vents
  2. Air conditioning system not engaging or turning off unexpectedly
  3. Illumination of the check engine light on the dashboard
  4. Unusual noises coming from the air conditioning system
  5. Reduced fuel efficiency due to the air conditioning system running inefficiently

How to Fix P2518 GMC

  1. Use a diagnostic scan tool to retrieve the specific trouble code and verify the high voltage condition in the air conditioning refrigerant pressure sensor 'B' circuit.
  2. Inspect the wiring and connectors in the circuit for any signs of damage or corrosion. Repair or replace any damaged components.
  3. Test the air conditioning refrigerant pressure sensor 'B' using a multimeter to determine if it is functioning correctly. Replace the sensor if necessary.
  4. Check the refrigerant levels in the air conditioning system and recharge if low. Ensure there are no leaks in the system.
  5. Clear the trouble code from the vehicle's onboard computer and test the air conditioning system to verify that the issue has been resolved.

Cost to Fix P2518 GMC

The typical repair costs for addressing the P2518 GMC code can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Factors such as the vehicle make and model, location, and engine type can also impact the overall repair costs.

What does this mean?

Tech Notes for P2518 GMC

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.

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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.

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