P2518 - OBD Trouble Code

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The trouble code P2518 can be explained as A/C Refrigerant Pressure Sensor "B" Circuit High. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things. The refrigerant pressure through the Air Condition (A/C) Pressure Sensor is being monitored by the engine control module. This trouble code would be set by the ECM when the A/C refrigerant pressure sensor "B" circuit would not be as per the specifications set by the manufacturer.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the A/C Refrigerant Pressure Sensor "B" Circuit High?

• Less refrigerant
• The refrigerant might be too much
• Quirks in the low side pressure sensor
• Low side pressure sensor harness might be unlocked
• Low side pressure sensor circuit bad electrical connection

1. A/C Compressor - Most of the people are not aware that the premature wear or damage to the compressor and compressor belts might result in the failure of the AC compressor. It would be nice if you get it replaced on time.
2. Engine Control Module - ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
3. Electronic Control Unit - The ECU coordinates with the temperature sensor to control the blower fan for keeping the battery temperatures under control. So, replace faulty ECU components now!
4. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2518 here:

Common Symptoms

• Appearance of the service engine soon light
• The A/C might signal a fault on the control panel for the A/C on some automobiles
• The A/C may be disabled on some vehicles as it totally depends upon manufacturer
• The A/C light may flash indicating an issue in the A/C system

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Rehabilitate the defaults in the control head
• The malfunctioning A/C refrigerant pressure switch should be repaired or replaced as per the need
• The refrigerant should be restored to working order
• You must fix the defective wiring and connectors
• It is essential to restore the flawed electrical connectors
• Recondition the non-functioning A/C refrigerant pressure sensor

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Here are some steps which you should follow in order to diagnose this fault code:

• As an initial step the mechanic will carefully inspect the vehicle with the help of a scanner.
• After this, the technician will connect a scanner to the diagnostic code so that he can recover all the codes and freeze frame data.
• Note down this information as it can clearly help for further diagnosis.
• After careful inspection, he will reset the code and test drive your vehicle to check for reappearance of the codes.
• He will know that an intermittent condition persists, if the code does not return instantly.
• The codes should be scanned and documents the code in the ECM or A/C module.
• Carefully inspect the A/C system charge level to make sure it is okay.
• After that compare sensor A and sensor B to compare sensors input versus the actual charge level.
• The manufacture pinpoint test should be performed on the A/C sensor to verify the failed sensor or wiring.

Common Mistakes When Diagnosing The P2518 Code

• Mistake of replacing the sensor without checking the sensor B reading versus sensor A.
• A lot of mechanics fails to clear the ECM or A/C codes after the codes are fixed.
• Another mistake might be replacing parts when the connector is shorted internally.