AutoCodes – GMC – P1542 GMC

P1542 GMC Code - A/C System High Pressure High Temperature

Quick Answer

P1542 GMC indicates A/C System High Pressure High Temperature. Common causes include Faulty A/C System Temperature Sensor, A/C System Temperature Sensor harness is open or shorted, A/C System 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: P1542 GMC indicates A/C System High Pressure High Temperature.
Common causes: Common causes include Faulty A/C System Temperature Sensor, A/C System Temperature Sensor harness is open or shorted, A/C System 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,550

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1542 GMC Description

OBDII Code P1542 GMC - A/C System High Pressure High Temperature - AutoCodes.com — P1542 GMC Code - A/C System High Pressure High Temperature

What does this mean?

What are the Possible Causes of the DTC P1542 GMC?

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

How to Fix the DTC P1542 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 P1542 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.

Need more information about the P1542 GMC code?

Need more information on how to fix the P1542 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1542 GMC code diagnosed by a professional: Find a repair shop in your area

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.