What does code P1544 mean?

Q: What does code P1544 mean?

A/C Refrigerant Condition Very Low. P1544 on a GM vehicle means the powertrain control module (PCM) has determined that the air conditioning (A/C) refrigerant charge is too low for safe compressor operation, based on pressure sensor readings that fall below the expected threshold. The PCM sets this code when the A/C pressure transducer reports a refrigerant condition that is very low, typically to prevent compressor damage from running with insufficient lubricant and refrigerant.

DTC codes / GM codes / P1544

P1544 · GMA/C Refrigerant Condition Very Low

P1544 on a GM vehicle means the powertrain control module (PCM) has determined that the air conditioning (A/C) refrigerant charge is too low for safe compressor operation, based on pressure sensor readings that fall below the expected threshold. The PCM sets this code when the A/C pressure transducer reports a refrigerant condition that is very low, typically to prevent compressor damage from running with insufficient lubricant and refrigerant.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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