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.
Circuit Description
A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. Powertrain Control Module (PCM) supplies and monitors 5-volt reference circuit to the pressure sensor. Pressure sensor operating range is 0-459 psi. At zero psi, signal voltage should be about 0.1 volt. At 459 psi or greater, signal voltage should be about 4.9 volts.
Conditions for setting this DTC are as follows:
- A/C pressure sensor signal is greater than 453 psi (4.94 volts) with A/C on.
- A/C pressure sensor signal is greater than 363 psi (4.0 volts) with A/C off.
- Refrigerant pressure is less than zero psi (0.20 volt), IAT signal is greater than 32°F (0°C) and DTC P0112 or P0113 is not set.
- Refrigerant pressure is less than zero psi (0.10 volt), IAT signal is greater than 32°F (0°C) and DTC P0112 or P0113 is set.
- Conditions exist for greater than 15 seconds.
NO RELATED
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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.