P0534 Code - Air Conditioner Refrigerant Charge Loss

What Does P0534 Mean?

The powertrain control module (ECM) monitors the high side refrigerant pressure via a A/C refrigerant pressure sensor. When the pressure is high the signal voltage is high. When the pressure is low the signal voltage is low. When pressure is high the ECM commands the cooling fans on. When pressure is too high or too low the PCM will not allow the A/C compressor clutch to engage.

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What are the common causes of P0534 ?

The P0534 code can be caused by several different underlying problems. All of the following can cause the clutch to cycle too frequently, or otherwise present symptoms of low AC refrigerant:

• Low refrigerant
• Overcharged refrigerant
• Inoperable cooling fans
• Short or open in the AC refrigerant pressure sensor circuit
• Bad/loose connection in the AC refrigerant pressure sensor circuit
• Faulty pressure sensor switch
• Faulty climate control head unit

How do you troubleshoot P0534 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0534 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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