Air Condition Refrigerant Pressure Sensor ‘B’ Circuit High


Table of contents

P2518 MERCEDES-BENZ Possible Causes

  • Low refrigerant
  • Too much refrigerant
  • Faulty Low Side Pressure Sensor
  • Low Side Pressure Sensor harness is open or shorted
  • Low Side Pressure Sensor circuit poor electrical connection

How do I fix code P2518 MERCEDES-BENZ?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Tech Notes

  • Do not just add more refrigerant, use an A/C machine to evacuate the refrigerant and charge the correct amount.

Cost of diagnosing the P2518 MERCEDES-BENZ code

  The cost of diagnosing the P2518 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

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.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2518 MERCEDES-BENZ Description

  The Powertrain Control Module (PCM) monitors the refrigerant pressure through the Air Condition (A/C) Pressure Sensor. The PCM supplies a 5V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure causes the sensor signal to the PCM to vary. When the pressure is high, the signal is high. When the pressure is low, the signal is low. The PCM sets the OBII code when the signal from the sensor is out of factory specifications.

Related Codes

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