AutoCodes – Cadillac – P1591 Cadillac

P1591 Cadillac 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 Cadillac 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 432

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

What does this mean?

What are the Possible Causes of the DTC P1591 Cadillac?

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 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 P1591 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.

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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 Cadillac Code

1. What are the common symptoms of OBDII code P1591 in a Cadillac?

- Common symptoms include engine stalling, rough idling, issues with starting the vehicle, and the check engine light being illuminated.

2. What can cause the OBDII code P1591 to be triggered in a Cadillac?

- The code P1591 is typically triggered when there is a communication error between the body control module and the engine control module in the vehicle.

3. How can I diagnose the OBDII code P1591 in my Cadillac?

- Diagnosis usually involves using a diagnostic scanner to read the code, checking for any other related codes, and inspecting the wiring and connectors between the body control module and engine control module.

4. Can a faulty Body Control Module (BCM) cause the P1591 code in a Cadillac?

- Yes, a faulty BCM can be a potential cause of the P1591 code, as it may result in a communication breakdown between the modules.

5. What are some repair tips for fixing the OBDII code P1591 in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, resetting the fault codes, and, if necessary, replacing the body control module.

6. Is it safe to continue driving my Cadillac with the P1591 trouble code?

- It is not recommended to continue driving the vehicle with the P1591 code present, as it may lead to further damage or unsafe driving conditions.

7. Can a DIY enthusiast fix the OBDII code P1591 issue in a Cadillac?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the root cause of the P1591 code may require professional assistance.

8. How much does it cost to repair the OBDII code P1591 in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but it is advisable to consult with a mechanic or dealership for an accurate estimate.

9. Will resetting the trouble codes make the P1591 code disappear in my Cadillac?

- Resetting the trouble codes may temporarily clear the P1591 code, but if the underlying issue is not addressed, the code is likely to reappear.

10. How long does it take to fix the OBDII code P1591 in a Cadillac?

- The repair time can vary based on the specific cause of the P1591 code, but it is best to allow sufficient time for diagnostics and any necessary repairs to be completed thoroughly.