Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The A/C pressure sensor is mounted in the Freon circuit of the A/C system. This sensor monitors the pressure in the system. This pressure information is part of the information the Totally Integrated Power Module (TIPM) uses to determine if the A/C clutch should turned on or off. This information is also important to protect the Freon compressor from damage. A MIL lamp will not be lit for this fault. The customer may notice poor A/C performance.