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P1591 2016 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

Quick Answer

The P1591 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Body Control Module (BCM) has detected an incorrect engine speed request signal message counter. Common causes include Faulty engine speed sensor, Wiring or connection issues between the BCM and ECM, Software or programming errors 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 2016 GMC Sierra indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty engine speed sensor, Wiring or connection issues between the BCM and ECM, Software or programming errors 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 2016 GMC Sierra Description

The P1591 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Body Control Module (BCM) has detected an incorrect engine speed request signal message counter. The BCM plays a crucial role in managing various functions and systems within the vehicle, including communication with the engine control module (ECM) to request specific engine speeds. When the BCM detects that the engine speed request signal message counter is incorrect, it means that there is a discrepancy between the expected and actual number of messages being sent or received related to engine speed control.

OBDII Code P1591 2016 GMC Sierra - Body Control Module Engine Speed Request Signal Message Counter Incorrect
P1591 2016 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect

Common Causes of P1591 2016 GMC Sierra

  1. Faulty engine speed sensor
  2. Wiring or connection issues between the BCM and ECM
  3. Software or programming errors in the BCM or ECM
  4. BCM or ECM hardware malfunction
  5. Electrical interference or communication errors within the vehicle's network

Symptoms of P1591 2016 GMC Sierra

  1. Engine misfires or hesitation
  2. Rough idle or uneven engine operation
  3. Reduced fuel efficiency
  4. Illumination of the check engine light
  5. Engine stalling or difficulty starting

How to Fix P1591 2016 GMC Sierra

  1. Perform a thorough diagnostic scan to confirm the P1591 code and pinpoint the exact cause of the issue.
  2. Inspect and test the engine speed sensor for proper operation and replace if necessary.
  3. Check the wiring and connections between the BCM and ECM for any damage, corrosion, or loose connections.
  4. Update or reprogram the BCM and ECM software to ensure proper communication and synchronization.
  5. If the issue persists, consider replacing the BCM or ECM to resolve the miscommunication between the two modules.

Cost to Fix P1591 2016 GMC Sierra

The cost of repairing a P1591 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the required repairs. In general, the typical cost for parts and labor to address this issue can range from $200 to $500 or more. It's essential to consider that diagnostic time and labor rates at auto repair shops can vary significantly, with hourly rates typically ranging from $80 to $150. Factors such as the location of the repair shop, the vehicle's make and model, and the complexity of the repair can all impact the final cost. To obtain a more accurate estimate, it's advisable to consult with a trusted mechanic or auto repair shop.

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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 2016 GMC Sierra Code

1. What does the OBDII code P1591 mean on a 2016 GMC Sierra?

P1591 indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter, meaning the signal from the BCM to the Engine Control Module (ECM) is not functioning correctly.

2. What are the common symptoms of code P1591 in a 2016 GMC Sierra?

Symptoms may include erratic shifting, reduced engine performance, a check engine light, or communication errors between the BCM and ECM.

3. What causes the P1591 code to appear on a 2016 GMC Sierra?

Common causes include a faulty Body Control Module (BCM), wiring or connector issues, a malfunctioning Engine Control Module (ECM), or software glitches in the communication system.

4. Can a failing BCM cause the P1591 code?

Yes, a failing BCM can cause this code, as it may not properly communicate the engine speed request signal to the ECM.

5. How can I diagnose the P1591 code on my 2016 GMC Sierra?

Start by scanning for additional trouble codes, inspecting the BCM and ECM connectors and wiring for damage, and using a diagnostic tool to monitor signal data between the modules.

6. Is it safe to drive with the P1591 code on a 2016 GMC Sierra?

Driving with this code may lead to reduced performance or erratic behavior, which could pose safety risks. It’s best to address the issue promptly.

7. How can I fix the P1591 code on my 2016 GMC Sierra?

Repairs may include reprogramming or replacing the BCM or ECM, repairing or replacing damaged wiring or connectors, or updating software to resolve communication errors.

8. Can a software update fix the P1591 code?

Yes, in some cases, a software update for the BCM or ECM can resolve the communication issue causing the code.

9. What tools do I need to troubleshoot the P1591 code?

You’ll need an OBDII scanner with advanced diagnostic capabilities, a multimeter for testing wiring, and possibly manufacturer-specific software for programming or updates.

10. How much does it cost to fix the P1591 code on a 2016 GMC Sierra?

Repair costs can vary widely, ranging from $100 for wiring repairs to $600 or more for module replacement and programming.

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