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P151D 2017 GMC Sierra Code - Transmission Control Module Engine Shutdown Request Signal Message Counter Incorrect

Quick Answer

The P151D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Transmission Control Module (TCM) has detected an incorrect signal message counter related to the engine shutdown request. Common causes include Faulty wiring or connections between TCM and ECM, Malfunctioning TCM or ECM, Defective transmission solenoids. 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
P151D 2017 GMC Sierra indicates Transmission Control Module Engine Shutdown Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty wiring or connections between TCM and ECM, Malfunctioning TCM or ECM, Defective transmission solenoids.
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 12, 2024
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Code P151D 2017 GMC Sierra Description

The P151D diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that the Transmission Control Module (TCM) has detected an incorrect signal message counter related to the engine shutdown request. In simpler terms, this means that the TCM is not receiving the expected number of signals from the engine control module (ECM) when the engine is being shut down. This miscommunication can lead to various issues with the vehicle's transmission control and overall performance.

OBDII Code P151D 2017 GMC Sierra - Transmission Control Module Engine Shutdown Request Signal Message Counter Incorrect
P151D 2017 GMC Sierra Code - Transmission Control Module Engine Shutdown Request Signal Message Counter Incorrect

Common Causes of P151D 2017 GMC Sierra

  1. Faulty wiring or connections between TCM and ECM
  2. Malfunctioning TCM or ECM
  3. Defective transmission solenoids
  4. Software issues within control modules
  5. Electrical interference or communication errors

Symptoms of P151D 2017 GMC Sierra

  1. Erratic shifting patterns
  2. Harsh or delayed gear changes
  3. Transmission slipping
  4. Reduced fuel efficiency
  5. Check Engine Light illuminated

How to Fix P151D 2017 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the root cause of the issue.
  2. Inspect and test the wiring and connections between the TCM and ECM for any faults or damage.
  3. Test the TCM, ECM, and transmission solenoids for proper functionality and replace any faulty components.
  4. Update the software in the control modules to the latest version to address any potential software issues.
  5. Clear the trouble codes, reset the TCM, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P151D 2017 GMC Sierra

The typical repair costs for addressing a P151D code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a new TCM, ECM, or transmission solenoids, as well as labor costs for diagnosis and repair, can range from $300 to $1000 or more. Additionally, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate.

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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 P151D 2017 GMC Sierra Code

1. What does the OBDII code P151D mean on a 2017 GMC Sierra?

P151D indicates that the Transmission Control Module (TCM) has detected an issue with the Engine Shutdown Request Signal Message Counter, specifically that it is incorrect or inconsistent.

2. What are the common symptoms of code P151D on a GMC Sierra?

Symptoms may include the Check Engine Light turning on, erratic transmission behavior, reduced engine performance, or the engine shutting down unexpectedly.

3. What causes the P151D code to appear on a 2017 GMC Sierra?

Common causes include a faulty Transmission Control Module (TCM), wiring or connector issues, software glitches in the TCM or ECM, or a failure in communication between the TCM and ECM.

4. Can a bad TCM cause the P151D code?

Yes, a malfunctioning TCM can cause the P151D code by failing to send or interpret the Engine Shutdown Request Signal Message Counter correctly.

5. How do you diagnose the P151D code on a GMC Sierra?

Diagnosis involves using a scan tool to check for related codes, inspecting the TCM and ECM wiring and connectors, updating module software if necessary, and performing communication tests between the TCM and ECM.

6. Can driving with the P151D code damage my 2017 GMC Sierra?

Driving with this code may lead to erratic engine or transmission behavior, which could potentially cause further mechanical issues or safety concerns.

7. How is the P151D code fixed on a GMC Sierra?

Repairs may involve reprogramming or replacing the TCM, repairing damaged wiring or connectors, or addressing any software communication errors between the TCM and ECM.

8. Is the P151D code related to transmission problems?

While the code originates from the TCM, it is more about communication between the TCM and ECM rather than a direct mechanical transmission issue.

9. How much does it cost to fix the P151D code on a 2017 GMC Sierra?

Repair costs vary but may range from $150 to $1,000 depending on whether the issue requires simple wiring repair, module reprogramming, or TCM replacement.

10. Can I clear the P151D code without repairs?

Clearing the code without addressing the root cause may temporarily turn off the Check Engine Light, but the issue will likely return until properly resolved.

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