AutoCodes – Buick – P1543 Buick

P1543 Buick Code - A/C System Performance

Quick Answer

With the engine running, the Powertrain Control module (PCM) detects that the A/C refrigerant charge was below a specified value (determined by the Evaporator Temperature and Refrigerant Pressure inputs) Common causes include Faulty A/C System, A/C System harness is open or shorted, A/C System 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: P1543 Buick indicates A/C System Performance.
Common causes: Common causes include Faulty A/C System, A/C System harness is open or shorted, A/C System 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 2,637

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 P1543 Buick Description

OBDII Code P1543 Buick - A/C System Performance - AutoCodes.com — P1543 Buick Code - A/C System Performance

What does this mean?

What are the Possible Causes of the DTC P1543 Buick?

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

How to Fix the DTC P1543 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 P1543 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.