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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Ricardo

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Extremely satisfied with the inspection Ricardo preformed! After he was done he broke down the issues so that I could understand. The quote he gave me was way less than the price the shop did. I will be booking him to finish the work for sure.
2006 MERCEDES-BENZ C230 - CHECK ENGINE LIGHT IS ON - EL SEGUNDO, CALIFORNIA
Mario

Mario

18 years of experience
48 reviews
Mario
18 years of experience
Very professional with his work, he was able to locate the problem within minutes. Awesome work!
2004 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON - NAPLES, FLORIDA
Jerome

Jerome

31 years of experience
94 reviews
Jerome
31 years of experience
It went well. He showed up on time was polite and very knowledgeable
2016 FORD FUSION - CHECK ENGINE LIGHT IS ON - UPPER MARLBORO, MARYLAND
Grzegorz

Grzegorz

38 years of experience
440 reviews
Grzegorz
38 years of experience
It was good. Grzegorz came on time. He did plugged in his diagnostic device into my car and he determined the problem. Gregorz suggested I told me I need to replace a sensor at the next appointment. He also replaced my drive belts because they were a little cracked.
2011 SUBARU FORESTER - CHECK ENGINE LIGHT IS ON - SAN FRANCISCO, CALIFORNIA

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