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

Quick Answer

The P1598 GMC diagnostic trouble code indicates that there is an issue with the Power Take Off (PTO) engine speed request signal message counter being incorrect. Common causes include Faulty engine speed sensor, Wiring or connector issues in the PTO system circuit, Malfunctioning PTO control module. 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 GMC indicates Power Take Off Engine Speed Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty engine speed sensor, Wiring or connector issues in the PTO system circuit, Malfunctioning PTO control module.
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 10, 2024
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Code P1598 GMC Description

The P1598 GMC diagnostic trouble code indicates that there is an issue with the Power Take Off (PTO) engine speed request signal message counter being incorrect. This code is typically found in vehicles equipped with a PTO system, which allows for the operation of auxiliary equipment such as hydraulic pumps, generators, or compressors while the vehicle is running. The PTO system relies on accurate communication between the engine control module (ECM) and the PTO control module to ensure proper operation.

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

Common Causes of P1598 GMC

  1. Faulty engine speed sensor
  2. Wiring or connector issues in the PTO system circuit
  3. Malfunctioning PTO control module
  4. ECM software glitch
  5. Mechanical issues with the PTO system components

Symptoms of P1598 GMC

  1. Inoperative PTO system
  2. Erratic operation of auxiliary equipment
  3. Engine stalling when PTO system is engaged
  4. Check Engine Light illuminated
  5. Reduced engine performance

How to Fix P1598 GMC

  1. Diagnose the P1598 code using a professional OBD-II scanner to pinpoint the exact cause of the issue.
  2. Inspect the engine speed sensor and its wiring connections for any damage or corrosion.
  3. Check the PTO control module for proper operation and replace if necessary.
  4. Update the ECM software to the latest version to address any software glitches.
  5. Test the PTO system functionality after repairs are completed to ensure proper operation.

Cost to Fix P1598 GMC

The cost of repairing a P1598 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary widely, so it is advisable to check local rates for a more accurate estimate. Additionally, the cost of any replacement parts needed for the repair will also contribute to the overall cost.

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Information for Specific GMC Models

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 GMC Code

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

P1598 indicates that the Power Take Off (PTO) Engine Speed Request Signal Message Counter is incorrect, which means there’s an issue with the communication or signal from the PTO system to the engine control module (ECM).

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

Symptoms may include the PTO not engaging or working properly, reduced engine performance while using the PTO, or the check engine light being illuminated.

3. What causes the P1598 code to appear on a GMC?

Common causes include a malfunctioning PTO system, a faulty signal or sensor, wiring issues, a damaged ECM, or software-related problems.

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

Yes, you can typically drive with this code active, but the PTO system may not function correctly, which could impact performance if your work depends on it.

5. How do I diagnose the P1598 code in a GMC vehicle?

Diagnosis involves using a scan tool to check the PTO system and ECM for related codes, inspecting wiring and connectors, and testing the PTO signal and sensors for proper operation.

6. What are the most common repairs for code P1598 in GMC vehicles?

Repairs often include repairing or replacing faulty PTO components, fixing damaged wiring or connectors, updating the ECM software, or replacing the ECM if necessary.

7. Can a software update fix the P1598 code on a GMC?

Yes, in some cases, a software update for the ECM may resolve communication issues causing the P1598 code. Check with a GMC dealer for available updates.

8. How much does it cost to fix the P1598 code on a GMC?

Repair costs can vary widely depending on the root cause, ranging from $100 for wiring repairs to over $1,000 if the ECM needs replacement.

9. Is the PTO system only used in commercial GMC vehicles?

No, while the PTO system is more common in commercial vehicles, it may also be present in some GMC trucks for heavy-duty applications.

10. Can a faulty ECM cause the P1598 code in a GMC?

Yes, a malfunctioning or damaged ECM can result in incorrect communication with the PTO system, triggering the P1598 code.

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