Engine-Codes.com
Engine-Codes – Chevrolet – P1591 2018 Chevrolet Silverado

P1591 2018 Chevrolet Silverado Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

Quick Answer

The P1591 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado indicates that the Body Control Module (BCM) is receiving an incorrect engine speed request signal message. Common causes include Faulty or damaged wiring harness between the BCM and ECM, Malfunctioning engine speed sensor or crankshaft position sensor, Software glitches or corruption in the BCM or ECM. 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 2018 Chevrolet Silverado indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty or damaged wiring harness between the BCM and ECM, Malfunctioning engine speed sensor or crankshaft position sensor, Software glitches or corruption in the BCM or ECM.
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 Oct 24, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1591 2018 Chevrolet Silverado Description

The P1591 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado indicates that the Body Control Module (BCM) is receiving an incorrect engine speed request signal message. This code is primarily associated with the communication between the BCM and the Engine Control Module (ECM). The BCM is responsible for various functions, including controlling the vehicle's electrical systems, and it relies on accurate data from the ECM to perform optimally. When the BCM detects that the engine speed request message count is incorrect, it triggers this code.

OBDII Code P1591 2018 Chevrolet Silverado - Body Control Module Engine Speed Request Signal Message Counter Incorrect
P1591 2018 Chevrolet Silverado Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

Common Causes of P1591 2018 Chevrolet Silverado

  1. Faulty or damaged wiring harness between the BCM and ECM.
  2. Malfunctioning engine speed sensor or crankshaft position sensor.
  3. Software glitches or corruption in the BCM or ECM.
  4. Poor ground connections affecting signal integrity.
  5. Physical damage to the BCM or ECM due to environmental factors or accidents.

Symptoms of P1591 2018 Chevrolet Silverado

  1. Erratic engine performance, including stalling or rough idling.
  2. Unresponsive acceleration or delayed throttle response.
  3. Warning lights illuminated on the dashboard, particularly the check engine light.
  4. Difficulty starting the engine or prolonged cranking before ignition.
  5. Reduced fuel efficiency due to improper engine management.

How to Fix P1591 2018 Chevrolet Silverado

  1. Diagnostic Scan: Begin by using a professional OBD-II scanner to confirm the P1591 code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the wiring harness and connectors between the BCM and ECM for signs of damage, corrosion, or loose connections.
  3. Sensor Testing: Test the engine speed sensor and crankshaft position sensor for proper functionality, replacing any faulty components as necessary.
  4. Software Update: If no physical issues are found, check for any available software updates for the BCM and ECM, as manufacturers often release updates to fix known bugs.
  5. Clear Codes and Test Drive: After repairs, clear the DTCs and perform a test drive to ensure that the issue has been resolved and that the vehicle operates normally.

Cost to Fix P1591 2018 Chevrolet Silverado

The typical repair costs for addressing a P1591 code can range from $150 to $600, depending on the specific cause of the issue. This estimate includes parts and labor, where labor rates can vary significantly based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It's advisable to check local rates for a more precise estimate and to obtain quotes from multiple repair shops to ensure competitive pricing.

Need more information about the P1591 2018 Chevrolet Silverado code?

Need more information on how to fix the P1591 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1591 2018 Chevrolet Silverado 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 P1591 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1591 in a 2018 Chevrolet Silverado?

- Common symptoms include engine stalling, rough idling, poor acceleration, and potential issues with the vehicle's electrical systems.

2. What does the OBDII code P1591 "Body Control Module Engine Speed Request Signal Message Counter Incorrect" mean in a 2018 Chevrolet Silverado?

- This code indicates a problem with the communication between the body control module and the engine control module related to the engine speed request signal counter being incorrect.

3. What are the possible causes of OBDII code P1591 in a 2018 Chevrolet Silverado?

- Possible causes include a faulty body control module, issues with the engine control module, wiring problems, poor electrical connections, or a software malfunction.

4. How can I diagnose the OBDII code P1591 in my 2018 Chevrolet Silverado?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors for any visible damage, and potentially performing a communication system test.

5. Can OBDII code P1591 in a 2018 Chevrolet Silverado cause serious damage if ignored?

- Ignoring this code can lead to potential drivability issues and further electrical system malfunctions. It is recommended to address the underlying problem promptly.

6. Is it safe to drive my 2018 Chevrolet Silverado with OBDII code P1591 present?

- It is not recommended to drive the vehicle with this code present, as it can affect the engine performance and overall safety of the vehicle.

7. How can I repair OBDII code P1591 in my 2018 Chevrolet Silverado?

- Repair options may include replacing the body control module, addressing wiring issues, checking and reprogramming modules, and ensuring all connections are secure and functioning properly.

8. Can I reset the OBDII code P1591 in my 2018 Chevrolet Silverado by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is essential to diagnose and address the underlying issue to prevent the code from reoccurring.

9. Are there any common recalls or technical service bulletins related to OBDII code P1591 in a 2018 Chevrolet Silverado?

- Checking with a Chevrolet dealership or using online resources to search for any relevant recalls or technical service bulletins can provide valuable information on this specific OBDII code.

10. Should I attempt to repair OBDII code P1591 in my 2018 Chevrolet Silverado myself, or seek professional help?

- Due to the complexity of diagnosing and repairing communication system issues, it is recommended to seek professional help from a qualified mechanic or dealership specializing in Chevrolet vehicles.

Discuss the causes and fixes for P1591 2018 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P1591 2018 Chevrolet Silverado comments

No comments found for this page.