Cadillac P1540: Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled

What Does The Cadillac P1540 Code Mean?

If DTC P1540 is stored as a history code it indicates that the DIM did receive a high A/C refrigerant pressure message from the PCM. This code could also be caused by an intermittent short to voltage on the sensor signal circuit.

What Are The Potential Causes Of The Cadillac P1540 Code?

Intermittent short to voltage on the sensor signal circuit

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> A/C Pressure Switch Sensor MT1339
>>> AC Pro Car AC Synthetic R134A Refrigerant
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

GM, 2013, Service Bullettin – Prior To Any Circuit Testing.