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Engine-Codes – Generic – P1591

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

Quick Answer

The Diagnostic Trouble Code (DTC) P1591 refers to a problem with the Body Control Module (BCM) Engine Speed Request Signal Message Counter being incorrect. Common causes include Faulty wiring or connectors between BCM and ECM, Malfunctioning BCM or ECM, Software glitch 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 indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty wiring or connectors between BCM and ECM, Malfunctioning BCM or ECM, Software glitch 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 Sep 10, 2024
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Code P1591 Description

The Diagnostic Trouble Code (DTC) P1591 refers to a problem with the Body Control Module (BCM) Engine Speed Request Signal Message Counter being incorrect. In simpler terms, this means that there is a discrepancy in the number of signals being sent between the BCM and the engine control module (ECM) related to the engine speed request. The BCM is responsible for various functions related to the body of the vehicle, such as lighting, door locks, and climate control. However, in this case, it is also involved in communicating with the ECM to request specific engine speeds.

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

Common Causes of P1591

  1. Faulty wiring or connectors between BCM and ECM
  2. Malfunctioning BCM or ECM
  3. Software glitch in the BCM or ECM
  4. Electrical interference or corrosion in the wiring

Symptoms of P1591

  1. Engine hesitation or surging
  2. Loss of power
  3. Illuminated Check Engine Light
  4. Rough idling
  5. Difficulty starting the vehicle

How to Fix P1591

  1. Perform a comprehensive diagnostic scan to retrieve the DTC and pinpoint the cause of the issue.
  2. Inspect the wiring and connectors between the BCM and ECM for any damage or corrosion. Repair or replace as necessary.
  3. Test the BCM and ECM functionality to determine if either module is malfunctioning. Replace the faulty module if needed.
  4. Update the software in the BCM and ECM to address any glitches causing the incorrect message counter.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1591

The typical repair costs for addressing a DTC P1591 can vary depending on the specific cause of the issue. On average, the parts and labor involved in diagnosing and repairing this problem can range from $200 to $500. However, it's essential to consider that labor rates at auto repair shops can vary depending on location, vehicle make and model, and the expertise of the technician. It's advisable to check with local repair shops for a more accurate estimate based on the specific circumstances.

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Code P1591 Information for Specific Makes

  • P1591 Buick — Body Control Module Engine Speed Request Signal Message Counter Incorrect
  • P1591 Cadillac — Body Control Module Engine Speed Request Signal Message Counter Incorrect
  • P1591 Chevrolet — Body Control Module Engine Speed Request Signal Message Counter Incorrect
  • P1591 GMC — Body Control Module Engine Speed Request Signal Message Counter Incorrect
  • P1591 Land Rover — Antilock Brake System Rough Road Signal Short Circuit To Ground Open Circuit
  • P1591 Subaru — Neutral Position Switch Circuit Low Input
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.

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