What does code P1547 mean?

Q: What does code P1547 mean?

A/C System Performance Degraded. P1547 on a GM vehicle means the powertrain control module has detected that the air conditioning system is not delivering the cooling performance it expects, based on inputs such as refrigerant pressure, evaporator temperature, and compressor operation. The computer is not pointing to a single failed part; it is reporting that the overall A/C performance has degraded beyond an acceptable threshold.

DTC codes / GM codes / P1547

P1547 · GMA/C System Performance Degraded

P1547 on a GM vehicle means the powertrain control module has detected that the air conditioning system is not delivering the cooling performance it expects, based on inputs such as refrigerant pressure, evaporator temperature, and compressor operation. The computer is not pointing to a single failed part; it is reporting that the overall A/C performance has degraded beyond an acceptable threshold.

SystemPowertrain

Code typeGM specific

SeverityLow

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.