AutoCodes – Buick – P1539 Buick

P1539 Buick Code - A/C Clutch Status High Input

Quick Answer

The Powertrain Control Module (PCM) activates the A/C clutch relay when the PCM detects an A/C request. 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 High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1539 Buick indicates A/C Clutch Status High Input.
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: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,828

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 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 P1539 Buick Description

The Powertrain Control Module (PCM) activates the A/C clutch relay when the PCM detects an A/C request. Voltage is present at both the A/C compressor clutch and the A/C clutch status terminal at the PCM when the relay is activated.

OBDII Code P1539 Buick - A/C Clutch Status High Input - AutoCodes.com — P1539 Buick Code - A/C Clutch Status High Input

What does this mean?

What are the Possible Causes of the DTC P1539 Buick?

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 P1539 Buick?

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 P1539 Buick 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.