AutoCodes – GMC – P1598 2017 GMC Sierra

P1598 2017 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 2017 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 225

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
FAQs
Comments
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Code P1598 2017 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 2017 GMC Sierra - Power Take Off Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P1598 2017 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 2017 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 2017 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 2017 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 2017 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.

Frequently Asked Questions about P1598 2017 GMC Sierra Code

1. What does the OBDII code P1598 mean on a 2017 GMC Sierra?

The P1598 code indicates that the Power Take Off (PTO) Engine Speed Request Signal Message Counter is incorrect, meaning the engine control module (ECM) is receiving invalid or missing data related to PTO operation.

2. What are the common symptoms of the P1598 code in a 2017 GMC Sierra?

Common symptoms include a malfunctioning PTO system, engine performance issues when the PTO is active, and the illumination of the check engine light.

3. What causes the P1598 code on a 2017 GMC Sierra?

Possible causes include a faulty PTO switch, damaged wiring or connectors in the PTO circuit, a malfunctioning ECM, or communication issues between the PTO module and the ECM.

4. Can I drive my 2017 GMC Sierra with the P1598 code?

Yes, you can typically drive the truck, but the PTO system may not work as intended. It’s best to address the issue promptly to avoid further complications.

5. How do I diagnose the P1598 code on my 2017 GMC Sierra?

Diagnosis involves scanning for additional codes, inspecting the PTO wiring and connectors, testing the PTO switch for proper operation, and verifying communication between the PTO module and ECM.

6. How can I fix the P1598 code on a 2017 GMC Sierra?

Repairs may include replacing a faulty PTO switch, repairing damaged wiring or connectors, updating or reprogramming the ECM, or replacing the ECM if it’s defective.

7. How much does it cost to repair the P1598 code on a 2017 GMC Sierra?

Repair costs vary depending on the exact issue but can range from $100 for wiring repairs to $1,000 or more for ECM replacement and programming.

8. Can a bad PTO switch cause the P1598 code?

Yes, a malfunctioning PTO switch can cause the P1598 code if it fails to send the correct engine speed request signal to the ECM.

9. Do I need special tools to fix the P1598 code on a 2017 GMC Sierra?

You may need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for testing electrical circuits, and possibly a scan tool for reprogramming the ECM.

10. Is the P1598 code a common issue for the 2017 GMC Sierra?

The P1598 code is not a very common issue, but it can occur on vehicles equipped with a PTO system, especially if there is wear or damage to related components.