AutoCodes – Generic – P1591

P1591 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 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 8,990

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
Comments
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Code P1591 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 - Body Control Module Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P1591 Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1591?

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?

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 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.

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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.