AutoCodes – GMC – P1546 GMC

P1546 GMC Code - A/C Clutch Status Circuit Low Voltage

Quick Answer

The Powertrain Control Module (PCM) will activate the A/C clutch relay when the PCM detects that A/C has been requested. Common causes include Faulty A/C Clutch Relay, A/C Clutch Relay harness is open or shorted, A/C Clutch Relay circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P1546 GMC indicates A/C Clutch Status Circuit Low Voltage.
Common causes: Common causes include Faulty A/C Clutch Relay, A/C Clutch Relay harness is open or shorted, A/C Clutch Relay circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 8,662

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1546 GMC Description

The Powertrain Control Module (PCM) will activate the A/C clutch relay when the PCM detects that A/C has been requested. When the PCM activates the relay, the voltage should be present at both the A/C compressor clutch and the A/C clutch status circuit at the PCM.

OBDII Code P1546 GMC - A/C Clutch Status Circuit Low Voltage - AutoCodes.com — P1546 GMC Code - A/C Clutch Status Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1546 GMC?

Faulty A/C Clutch Relay
A/C Clutch Relay harness is open or shorted
A/C Clutch Relay circuit poor electrical connection

How to Fix the DTC P1546 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1546 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.