AutoCodes – Cadillac – P1531 Cadillac

P1531 Cadillac 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 Cadillac 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 7,159

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

What does this mean?

What are the Possible Causes of the DTC P1531 Cadillac?

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 Cadillac?

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 Cadillac 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.

Frequently Asked Questions about P1531 Cadillac Code

No Frequently Asked Questions about P1531 Cadillac Code found.

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TIM
Date: January 28, 2015 at 6:32 pm

2003 CADILLAC CTS 3.2 P1531 WHERE IS A/C TEMP SENSOR CIRCUIT LOCATED?

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OBDIITech
Date: January 28, 2015 at 11:52 pm

The P1531 code means that there is a problem with the evaporator temperature sensor, either the sensor have failed or the wires to to the sensor. The "Evaporator Temperature Sensor" is next to the evaporator core and it's also called "Thermistor"

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