Low refrigerant charge caused by a leak; Faulty A/C pressure sensor or its wiring and connector; Compressor clutch, relay or clutch circuit fault; Poor condenser airflow from a blocked condenser or faulty cooling fan; Worn compressor or restriction in the refrigerant circuit (blocked orifice tube or expansion valve, depending on model); Faulty temperature sensor or blend door fault giving false readings (model dependent).

P1547

A/C System Performance Degraded.

Chrysler
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
5: AreaVehicle speed, idle control and auxiliary inputs
47: FaultThe specific fault in that area

What it means

On Chrysler vehicles P1547 means the air conditioning system performance is degraded. The control unit has judged that the A/C is not working as well as expected, based on signals such as refrigerant pressure, compressor operation or temperature readings. The exact inputs and test conditions depend on the model and year.

Symptoms

A/C blows warm or only slightly cool air
A/C cooling is weak at idle but better when driving
Compressor clutch cycles rapidly or does not engage
Air conditioning warning or fault light on some models
Engine cooling fan runs more than normal with A/C on

Possible causes

Low refrigerant charge caused by a leaklikely
Faulty A/C pressure sensor or its wiring and connectorlikely
Compressor clutch, relay or clutch circuit faultpossible
Poor condenser airflow from a blocked condenser or faulty cooling fanpossible
Worn compressor or restriction in the refrigerant circuit (blocked orifice tube or expansion valve, depending on model)possible
Faulty temperature sensor or blend door fault giving false readings (model dependent)rare

How to diagnose

Read all stored and pending codes and the freeze frame data to see engine and A/C conditions when the code set.
Check that the A/C works and note vent temperature, compressor clutch engagement and whether the clutch cycles too often.
Inspect the A/C pressure sensor, compressor clutch and relay wiring and connectors for damage, corrosion or looseness.
Check the condenser for debris or bent fins and confirm the cooling fan runs when the A/C is switched on.
Look over the pipes, joints and compressor for oil staining that suggests a refrigerant leak.
Have a qualified person measure system pressures with suitable gauges and compare them with the manufacturer's figures for your model.
Use live data to compare the pressure sensor reading with the measured pressure, and test the clutch relay and supply.
Test for restrictions or compressor wear only after the charge, sensors and airflow are confirmed correct.

How to fix

Locate and repair the refrigerant leak, then evacuate and recharge to the specified amount using qualified refrigerant handling.
Replace a faulty A/C pressure sensor or repair damaged wiring and connectors.
Replace a faulty compressor clutch relay or repair the clutch circuit, or replace the clutch or compressor if worn.
Clean or repair the condenser and fix any cooling fan fault to restore airflow.
Replace a blocked expansion device or restricted component, and renew the receiver or accumulator as the repair procedure requires.

Can I keep driving?

Low severity

The car can normally be driven as the fault mainly affects cooling comfort, so book it in for repair. Stop and have it checked if the compressor makes grinding noises or the drive belt squeals or is damaged.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.