AutoCodes – Cadillac – P1598 Cadillac

P1598 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 408

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1598 Cadillac 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 Cadillac - Power Take Off Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P1598 Cadillac Code - Power Take Off Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1598 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

Need more information on how to fix the P1598 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1598 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

What does OBDII code P1598 mean on a Cadillac?

Code P1598 indicates an issue with the Power Take Off (PTO) Engine Speed Request Signal, specifically that the message counter is incorrect or inconsistent.

What are the common symptoms of P1598 on a Cadillac?

Symptoms may include reduced engine performance, erratic RPM behavior, or the inability to engage PTO functions properly.

What causes code P1598 to appear on a Cadillac?

Causes include faulty PTO system wiring, a malfunctioning PTO module, communication errors between the engine and PTO systems, or issues with the engine control module (ECM).

Can a faulty PTO module trigger the P1598 code?

Yes, a malfunctioning PTO module can cause incorrect signal messages and lead to the P1598 code.

How is code P1598 diagnosed on a Cadillac?

Technicians use an OBDII scanner to identify the code and inspect the PTO module, wiring, and ECM for communication or hardware issues.

Can P1598 cause drivability problems?

Yes, this code may result in reduced engine performance or prevent the PTO system from functioning correctly, depending on the severity of the issue.

Is it safe to drive with code P1598 active?

While the vehicle may be drivable, ignoring the code could lead to further damage or impaired PTO functionality. Prompt inspection is recommended.

How can P1598 be fixed on a Cadillac?

Repairs may involve checking and repairing PTO system wiring, replacing the PTO module, or reprogramming or replacing the ECM.

Does clearing the P1598 code resolve the issue?

Clearing the code may temporarily remove the warning, but the underlying issue must be resolved to prevent the code from reappearing.

What tools are needed to fix P1598 on a Cadillac?

Youâ€™ll typically need an OBDII scanner, a multimeter for testing wiring, and potentially replacement PTO system components or ECM reprogramming tools.