AutoCodes – GMC – P1598 2015 GMC Sierra

P1598 2015 GMC Sierra Code - Power Take Off Engine Speed Request Signal Message Counter Incorrect

Quick Answer

The Power Take-Off Control Module is constantly sending the Engine Control Module (ECM) serial data messages with information regarding its request for modifying engine speed. Common causes include Faulty Power Take-Off Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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: P1598 2015 GMC Sierra indicates Power Take Off Engine Speed Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Power Take-Off Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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 363

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1598 2015 GMC Sierra Description

The Power Take-Off Control Module is constantly sending the Engine Control Module (ECM) serial data messages with information regarding its request for modifying engine speed. The Engine Control Module sets this code when it detects a discrepancy in the structure of this message causing its integrity to be questioned.
The Diagnostic Trouble Code (DTC) will be set when the Power Take-Off Control Module detects a fault in the serial data message between the Power Take-Off Control Module and the Engine Control Module.

OBDII Code P1598 2015 GMC Sierra - Power Take Off Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P1598 2015 GMC Sierra Code - Power Take Off Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1598 2015 GMC Sierra?

Faulty Power Take-Off Control Module
Power Take-Off Control Module harness is open or shorted
Power Take-Off Control Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1598 2015 GMC Sierra?

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 P1598 2015 GMC Sierra 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 P1598 2015 GMC Sierra 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.