AutoCodes – Buick – P1531 Buick

P1531 Buick Code - A/C Low Side Temperature Sensor Fault

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module monitors the evaporator temperature via the evaporator temperature sensor. Common causes include Faulty A/C Low Side Temperature Sensor, A/C Low Side Temperature Sensor harness is open or shorted, A/C Low Side Temperature Sensor 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: P1531 Buick indicates A/C Low Side Temperature Sensor Fault.
Common causes: Common causes include Faulty A/C Low Side Temperature Sensor, A/C Low Side Temperature Sensor harness is open or shorted, A/C Low Side Temperature Sensor 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 3,766

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 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1531 Buick Description

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module monitors the evaporator temperature via the evaporator temperature sensor. When the air is cold, the sensor resistance and signal voltage are high. When the air is warm, the sensor resistance and signal are low.

OBDII Code P1531 Buick - A/C Low Side Temperature Sensor Fault - AutoCodes.com — P1531 Buick Code - A/C Low Side Temperature Sensor Fault

What does this mean?

What are the Possible Causes of the DTC P1531 Buick?

Faulty A/C Low Side Temperature Sensor
A/C Low Side Temperature Sensor harness is open or shorted
A/C Low Side Temperature Sensor circuit poor electrical connection

How to Fix the DTC P1531 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 P1531 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.