Faulty A/C clutch relay, for example stuck or sticking contacts or a failing coil; Wiring fault in the clutch feed or feedback circuit, such as a short to voltage or chafed insulation; Corroded, loose or damaged connector at the compressor clutch, relay base or control unit; Open or failing A/C compressor clutch coil upsetting the feedback voltage; Fault in the A/C control or request circuit, such as a pressure switch or climate control input, affecting clutch operation; Internal fault in the engine control unit or the module driving the clutch circuit.

P1539

Air Conditioning (A/C) Clutch Feedback Circuit High Voltage.

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
39: FaultThe specific fault in that area

What it means

P1539 on a Chrysler is logged as an Air Conditioning (A/C) Clutch Feedback Circuit High Voltage fault. The control unit monitors the voltage on the A/C clutch circuit and saw it higher than expected, for example when the clutch was commanded off or when it did not match the commanded state. The exact monitoring method and set conditions vary by model and engine, so check the manufacturer data for the vehicle.

Symptoms

A/C blowing warm or not cooling
A/C compressor clutch not engaging, or engaging intermittently
Engine warning light on
A/C clutch cycling erratically
No noticeable change in engine running in some cases

Possible causes

Faulty A/C clutch relay, for example stuck or sticking contacts or a failing coillikely
Wiring fault in the clutch feed or feedback circuit, such as a short to voltage or chafed insulationlikely
Corroded, loose or damaged connector at the compressor clutch, relay base or control unitpossible
Open or failing A/C compressor clutch coil upsetting the feedback voltagepossible
Fault in the A/C control or request circuit, such as a pressure switch or climate control input, affecting clutch operationpossible
Internal fault in the engine control unit or the module driving the clutch circuitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including whether the A/C was requested when the code set
Check whether the code returns after clearing it, with the A/C on and off
Visually inspect the A/C clutch wiring, relay base and connectors for chafing, corrosion, water ingress or heat damage
Check the battery and charging system voltage, as low or erratic voltage can upset the circuit readings
Swap or bench test the A/C clutch relay and check the relay base terminals for voltage and earth against the wiring diagram
With the A/C commanded on and off, measure the voltage at the clutch connector and compare it with the expected values for the model
Test the clutch coil resistance and check the clutch feed and feedback wires for shorts to voltage and for continuity
Check the A/C pressure switch and climate control request signals, and look for any manufacturer service information or software updates for the model

How to fix

Replace the A/C clutch relay if it is faulty
Repair or replace damaged wiring and fix any short to voltage in the clutch circuit
Clean, repair or replace corroded or damaged connectors and terminals
Replace the A/C compressor clutch coil or the compressor if the clutch is faulty
Repair or replace any faulty pressure switch or A/C request input found during testing
Replace or update the control unit only after the wiring and components have been proven good and the manufacturer procedure calls for it

Can I keep driving?

Low severity

The car can normally be driven, as the fault mainly affects the A/C. Book it in for repair soon, and avoid using the A/C if the clutch is behaving erratically.

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