Faulty A/C compressor clutch coil (open circuit or high resistance); Damaged, chafed or corroded wiring or connector on the clutch feedback or clutch control circuit; Faulty A/C clutch relay or poor relay terminal contact; Blown fuse or poor power supply to the clutch circuit; Poor earth connection on the clutch or relay circuit; Low refrigerant charge or pressure switch fault causing the clutch to be cut out unexpectedly; Faulty powertrain control module driver or feedback input.

P1546

Air Conditioning (A/C) Clutch Feedback Circuit Low 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
46: FaultThe specific fault in that area

What it means

P1546 on a Chrysler means the powertrain control module has detected a low voltage on the A/C clutch feedback circuit. The module monitors the circuit that drives or reports on the A/C compressor clutch relay and clutch coil, and it saw a voltage lower than expected when the clutch was commanded on or off. The exact circuit layout and test conditions vary by model and engine, so check the manufacturer's wiring information for the vehicle.

Symptoms

A/C blows warm or does not cool
A/C compressor clutch does not engage or engages intermittently
Compressor cycling on and off rapidly
Engine management warning light on
No noticeable change in engine idle when A/C is switched on

Possible causes

Faulty A/C compressor clutch coil (open circuit or high resistance)likely
Damaged, chafed or corroded wiring or connector on the clutch feedback or clutch control circuitlikely
Faulty A/C clutch relay or poor relay terminal contactlikely
Blown fuse or poor power supply to the clutch circuitpossible
Poor earth connection on the clutch or relay circuitpossible
Low refrigerant charge or pressure switch fault causing the clutch to be cut out unexpectedlypossible
Faulty powertrain control module driver or feedback inputrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting whether the A/C was requested at the time
Check the relevant fuses and the A/C clutch relay, including terminal condition and a swap test with a known good identical relay
Visually inspect the compressor clutch connector and the wiring to the relay and control module for chafing, corrosion, water ingress and heat damage
With the A/C requested, check for battery voltage and a good earth at the compressor clutch connector
Measure the clutch coil resistance and compare it with the manufacturer's specification; check the air gap and clutch condition
Check refrigerant pressure and the A/C pressure switch operation, as a pressure cut-out may be removing the clutch supply
Back-probe the feedback circuit at the control module with a multimeter and check for shorts to earth or an open circuit using the wiring diagram
Only after all wiring and components pass, consider testing or replacing the control module and check for any applicable software updates

How to fix

Replace the compressor clutch coil or clutch assembly if the coil is open, shorted or out of specification
Repair or replace damaged wiring and connectors, and clean or restore poor earth connections
Replace a faulty A/C clutch relay or a blown fuse after finding why it failed
Correct low refrigerant charge by finding and repairing the leak, then recharge to the specified amount
Replace a faulty pressure switch
Repair or replace the powertrain control module only when confirmed faulty, applying any official calibration update if it is a known cause

Can I keep driving?

Low severity

The car is normally safe to drive, as this fault affects only the air conditioning. Book it in for repair, and avoid running the A/C if the compressor is making noise or the clutch is behaving erratically.

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