P2518 OBD-II Trouble Code: A/C Refrigerant Pressure Sensor “B” Circuit High

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Cost of diagnosing the P2518 code

P2518 is a diagnostic trouble code (DTC) for "A/C Refrigerant Pressure Sensor “B” Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
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P2518 trouble code definition

A/C Refrigerant Pressure Sensor “B” Circuit High

What the P2518 code means

P2518 is an OBD-II generic code for the engine control module (ECM) detecting the A/C refrigerant pressure sensor B is shorted to reference voltage.

What causes the P2518 code?

  • The ECM got a short circuit signal from the A/C refrigerant pressure sensor B and sets the code in memory.

  • The signal may come through the A/C control module through the network on some vehicles.

What are the symptoms of the P2518 code?

  • The A/C may signal a fault on the control panel for the A/C on some vehicles.
  • The A/C may be disabled on some vehicles depending on manufacturer.
  • The A/C light may flash indicating a problem in the A/C system.

How does a mechanic diagnose the P2518 code?

  • Scans codes and documents the code in the ECM or A/C module

  • Checks the A/C system charge level to make sure it is okay

  • Compares sensor A and sensor B to compare sensors input versus the actual charge level

  • Performs the manufacture pinpoint test on the A/C sensor to verify the failed sensor or wiring

Common mistakes when diagnosing the P2518 code

  • Replacing the sensor without verifying the sensor B reading versus sensor A
  • Failing to clear the ECM or A/C codes after the codes are fixed
  • Replacing parts when the connector is shorted internally

How serious is the P2518 code?

Code P2518 is a code for the A/C system and will only be an uncomfortable situation due the A/C not working on a hot day.

What repairs can fix the P2518 code?

  • Replacing the A/C pressure sensor B
  • Repairing the wiring harness or connector to sensor

Additional comments for consideration regarding the P2518 code

Code P2518 is not very common since most vehicles do not have two pressure sensors in the A/C systems they have and only use one.

Need help with a P2518 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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P2518

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Paul

30 years of experience
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Paul
30 years of experience
Paul was on time and was very competent.
2004 DODGE GRAND CARAVAN - CHECK ENGINE LIGHT IS ON - RALEIGH, NORTH CAROLINA

Joe

40 years of experience
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Joe
40 years of experience
I have to tell you that Joe is a good mechanic, He came out to service my vehicle for a diagnostic test because of check engine light was on. He showed up exactly on time, lol his phone call woke me up.so I was late. He diagnosed the problem after doing a safety inspection. I found out that it was an O2 sensor down stream, he is coming back on Thursday to repair and also doing my break switch that was showing needed to be replaced also. I found Joe was fair and honest, he didn't think getting my break switch was necessary as I don't use cruise control after telling him, check engine only goes on during City driving vs Highway driving, I said thank you for honesty, but I am getting that repaired as well. i found him very professional, knowledgeable, easy to communicate with. THANK YOU JOE!!! after thought he didn't try and sell me unecessary parts and his diagnostic testing matched one I had with another diagnostic test.
2011 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - SAINT PETERSBURG, FLORIDA

Jose

22 years of experience
57 reviews
Jose
22 years of experience
Very thorough with his explanation on the problem. Knowledgable and knows what he is talking about.
2002 TOYOTA AVALON - CHECK ENGINE LIGHT IS ON - VALLEJO, CALIFORNIA

Ben

38 years of experience
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Ben
38 years of experience
Ben showed up before my scheduled time (which was great!), completed the diagnostic quickly, and even gave me some detailed information about my issue. I look forward to Ben returning with the parts and fixing the issue.
2003 FORD THUNDERBIRD - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS

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