What does code P1540 mean?

Q: What does code P1540 mean?

A/C System High Pressure. P1540 on Chrysler vehicles means the powertrain control module (PCM) has detected an abnormally high pressure in the air conditioning (A/C) system, usually by monitoring the A/C pressure sensor or switch. The PCM sets this code when the pressure reading exceeds the calibrated limit for a set time, often disabling the A/C compressor clutch to protect the system from damage.

DTC codes / Chrysler codes / P1540

P1540 · ChryslerA/C System High Pressure

P1540 on Chrysler vehicles means the powertrain control module (PCM) has detected an abnormally high pressure in the air conditioning (A/C) system, usually by monitoring the A/C pressure sensor or switch. The PCM sets this code when the pressure reading exceeds the calibrated limit for a set time, often disabling the A/C compressor clutch to protect the system from damage.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.