P1598 GMC 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 GMC 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.
Code P1598 GMC Description
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.
What are the Possible Causes of the DTC P1598 GMC?
- 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 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 P1598 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 P1598 GMC code?
Need more information on how to fix the P1598 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1598 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P1598 2014 GMC Sierra — Power Take Off Engine Speed Request Signal Message Counter Incorrect
- P1598 2015 GMC Sierra — Power Take Off Engine Speed Request Signal Message Counter Incorrect
- P1598 2016 GMC Sierra — Power Take Off Engine Speed Request Signal Message Counter Incorrect
- P1598 2017 GMC Sierra — Power Take Off Engine Speed Request Signal Message Counter Incorrect
- P1598 2018 GMC Sierra — Power Take Off Engine Speed Request Signal Message Counter Incorrect
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.
Discuss the causes and fixes for P1598 GMC OBDII Code
Code P1598 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
