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P1598 2017 GMC Sierra Code - Power Take Off Engine Speed Request Signal Message Counter Incorrect

Quick Answer

The P1598 diagnostic trouble code (DTC) on a 2017 GMC Sierra indicates that the Power Take Off (PTO) engine speed request signal message counter is incorrect. Common causes include Faulty PTO engine speed sensor, Wiring issues or poor connections between the ECM and PTO system, ECM software malfunction. 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 PTO engine speed sensor, Wiring issues or poor connections between the ECM and PTO system, ECM software malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P1598 2017 GMC Sierra Description

The P1598 diagnostic trouble code (DTC) on a 2017 GMC Sierra indicates that the Power Take Off (PTO) engine speed request signal message counter is incorrect. This code is typically related to the communication between the engine control module (ECM) and the PTO system. The PTO system allows the vehicle to power auxiliary equipment, such as a hydraulic pump or generator, using the engine's power. When the ECM detects that the message counter for the PTO engine speed request signal is incorrect, it means that there is a discrepancy in the data being exchanged between the two systems.

OBDII Code P1598 2017 GMC Sierra - Power Take Off Engine Speed Request Signal Message Counter Incorrect
P1598 2017 GMC Sierra Code - Power Take Off Engine Speed Request Signal Message Counter Incorrect

Common Causes of P1598 2017 GMC Sierra

  1. Faulty PTO engine speed sensor
  2. Wiring issues or poor connections between the ECM and PTO system
  3. ECM software malfunction
  4. PTO system hardware failure
  5. Incorrect PTO system calibration

Symptoms of P1598 2017 GMC Sierra

  1. Inability to engage the PTO system
  2. Reduced power output when using auxiliary equipment
  3. Engine stalling when attempting to engage the PTO system
  4. Check Engine Light illuminated on the dashboard

How to Fix P1598 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the PTO system components, including the engine speed sensor and wiring connections.
  2. Use a diagnostic scanner to retrieve the specific details of the P1598 code and any related codes for further troubleshooting.
  3. Test the PTO system components for proper functionality and replace any faulty parts, such as the engine speed sensor or wiring harness.
  4. Clear the DTCs from the ECM's memory and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, reprogram the ECM with the latest software updates to address any potential software issues.

Cost to Fix P1598 2017 GMC Sierra

The typical repair costs for addressing a P1598 DTC on a 2017 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. For a more accurate estimate, it is recommended to consult with a local auto repair shop.

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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.

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