AutoCodes – GMC – P1591 2017 GMC Sierra

P1591 2017 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Body Control Module, Body Control Module harness is open or shorted, Body 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: P1591 2017 GMC Sierra indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Body Control Module, Body Control Module harness is open or shorted, Body 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 175

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1591 2017 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Body Control Module Engine Speed Request Signal Message Counter is Incorrect.

OBDII Code P1591 2017 GMC Sierra - Body Control Module Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P1591 2017 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1591 2017 GMC Sierra?

Faulty Body Control Module
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection

How to Fix the DTC P1591 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 P1591 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 P1591 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 P1591 2017 GMC Sierra Code

1. What does the OBDII code P1591 mean on a 2017 GMC Sierra?

P1591 indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter, which may be incorrect or out of sync.

2. What are the common symptoms of code P1591 in a 2017 GMC Sierra?

Common symptoms include reduced engine performance, erratic idle, loss of cruise control functionality, or the vehicle entering limp mode.

3. What causes the P1591 code to appear in a 2017 GMC Sierra?

This code can be caused by faulty communication between the BCM and the Engine Control Module (ECM), wiring or connector issues, a failing BCM, or software glitches.

4. Can a faulty BCM cause the P1591 code in a 2017 GMC Sierra?

Yes, a malfunctioning BCM can cause incorrect signal message counters, leading to the P1591 code being triggered.

5. How can wiring issues lead to the P1591 code?

Damaged, corroded, or loose wiring or connectors between the BCM and ECM can disrupt communication, causing the message counter to be incorrect.

6. Is it safe to drive a 2017 GMC Sierra with the P1591 code?

While the vehicle may still be drivable, it could experience reduced performance or enter limp mode, so addressing the issue promptly is recommended.

7. How do you diagnose the P1591 code on a 2017 GMC Sierra?

Diagnosis typically involves scanning for codes, inspecting BCM and ECM wiring and connectors, and testing the communication signals between the modules.

8. Can software updates fix the P1591 code in a 2017 GMC Sierra?

In some cases, reprogramming or updating the BCM or ECM software can resolve the issue if it's caused by a software glitch.

9. What repairs are commonly needed for the P1591 code?

Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, reprogramming the BCM or ECM, or replacing a faulty BCM.

10. How much does it cost to fix the P1591 code on a 2017 GMC Sierra?

Repair costs vary depending on the issue, but diagnosing and addressing wiring or connection problems might cost $100-$300, while a BCM replacement can cost $400-$900 or more.