AutoCodes – GMC – P1536 GMC

P1536 GMC Code - Engine Coolant Overtemperature Air Conditioning Disabled

Quick Answer

The A/C compressor requested by HVAC controller, the Powertrain Control Module (PCM) detects the Engine Coolant Temperature (ECT) input was over 257°F, or with A/C compressor operation requested or not requested by the HVAC controller, the ECT input was over 248°F. Common causes include Faulty Engine Coolant Temperature Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor 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: P1536 GMC indicates Engine Coolant Overtemperature Air Conditioning Disabled.
Common causes: Common causes include Faulty Engine Coolant Temperature Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor 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 3,156

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1536 GMC Description

OBDII Code P1536 GMC - Engine Coolant Overtemperature Air Conditioning Disabled - AutoCodes.com — P1536 GMC Code - Engine Coolant Overtemperature Air Conditioning Disabled

What does this mean?

What are the Possible Causes of the DTC P1536 GMC?

Faulty Engine Coolant Temperature Sensor
Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection

How to Fix the DTC P1536 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 P1536 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 P1536 GMC code?

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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.