Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Theory Of Operation
The A/C Pressure Sensor measures the pressure of refrigerant in the A/C system. As the Electric A/C Compressor (EAC) speed increases, the pressure should also increase. The A/C Pressure Sensor incorporates 5 Volt Supply, Signal, and Sensor Ground (or return) circuits that connect to the Power Inverter Module (PIM). The Hybrid Control Processor (HCP) monitors the A/C Pressure Signal and 5 Volt Supply for faults. If a fault occurs on any of these three circuits it effects the signal voltage. If the signal voltage reads outside of a calibrated fail window, a DTC will set. The HCP is internally located in the PIM and is not serviced separately.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.