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P155D 2016 GMC Sierra Code - Hill Descent Control Message Counter Incorrect

Quick Answer

The P155D diagnostic trouble code (DTC) specifically pertains to the Hill Descent Control (HDC) system in a 2016 GMC Sierra. Common causes include Faulty HDC system sensors, Wiring issues within the HDC system, Communication errors between HDC system components. 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
P155D 2016 GMC Sierra indicates Hill Descent Control Message Counter Incorrect.
Common causes
Common causes include Faulty HDC system sensors, Wiring issues within the HDC system, Communication errors between HDC system components.
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 17, 2024
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Code P155D 2016 GMC Sierra Description

The P155D diagnostic trouble code (DTC) specifically pertains to the Hill Descent Control (HDC) system in a 2016 GMC Sierra. This code indicates that the message counter for the HDC system is incorrect, meaning that the vehicle's onboard computer is not receiving the expected number of messages related to the HDC system. The HDC system is designed to assist the driver when descending steep grades by automatically controlling the vehicle's speed, utilizing the vehicle's braking system to maintain a safe and steady pace downhill.

OBDII Code P155D 2016 GMC Sierra - Hill Descent Control Message Counter Incorrect
P155D 2016 GMC Sierra Code - Hill Descent Control Message Counter Incorrect

Common Causes of P155D 2016 GMC Sierra

  1. Faulty HDC system sensors
  2. Wiring issues within the HDC system
  3. Communication errors between HDC system components
  4. Malfunctioning onboard computer responsible for monitoring the HDC system
  5. Environmental factors such as water or debris affecting HDC system components

Symptoms of P155D 2016 GMC Sierra

  1. Dashboard warning light related to the HDC system
  2. Inability to engage or operate the HDC system
  3. Loss of control or erratic behavior when descending steep grades
  4. Reduced braking effectiveness while descending hills
  5. Unusual noises or vibrations while using the HDC system

How to Fix P155D 2016 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to confirm the presence of the P155D DTC and identify any additional related codes.
  2. Inspect the HDC system components, including sensors, wiring, and the onboard computer, for any visible damage or signs of malfunction.
  3. Test the communication between HDC system components to pinpoint any communication errors that may be causing the incorrect message counter.
  4. Replace any faulty sensors or wiring within the HDC system, ensuring proper installation and connection.
  5. Clear the DTC codes from the vehicle's computer and perform a test drive to verify that the HDC system is functioning correctly.

Cost to Fix P155D 2016 GMC Sierra

The typical repair costs for addressing the P155D DTC in a 2016 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. It's important to note that the 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 is advisable to consult with a professional mechanic to obtain a more accurate estimate based on the specific circumstances of the vehicle in question.

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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 P155D 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P155D in a 2016 GMC Sierra related to the Hill Descent Control Message Counter Incorrect?

- The common symptoms include the Hill Descent Control (HDC) warning light illuminating on the dashboard and a possible loss of functionality in the HDC system.

2. What are the possible causes of OBDII code P155D in a 2016 GMC Sierra?

- The code P155D typically indicates that the message counter for the Hill Descent Control system is reporting incorrect data. This can be caused by a faulty control module, wiring issues, or software glitches.

3. How can I diagnose the OBDII code P155D in my 2016 GMC Sierra?

- To diagnose the issue, a professional diagnostic scanner capable of reading GMC-specific codes is recommended. This will help pinpoint the exact cause of the incorrect message counter related to the Hill Descent Control system.

4. Can I still drive my 2016 GMC Sierra with the OBDII code P155D present?

- While the vehicle may still be driveable with the code present, it is advisable to have the issue diagnosed and repaired to ensure the proper functioning of the Hill Descent Control system.

5. How can I repair the Hill Descent Control Message Counter Incorrect issue in my 2016 GMC Sierra?

- Repairing the P155D code may involve checking and repairing any wiring issues, replacing the control module if necessary, or updating the system software to correct the message counter discrepancy.

6. Is it safe to continue using the Hill Descent Control system if the OBDII code P155D is triggered?

- It is not recommended to use the Hill Descent Control system if the P155D code is present, as the incorrect message counter could affect the system's performance and potentially compromise safety.

7. Will resetting the OBDII code P155D in my 2016 GMC Sierra make the issue go away permanently?

- Simply resetting the code may clear the warning light temporarily, but if the underlying issue causing the incorrect message counter is not addressed, the code is likely to reappear.

8. Can a DIY enthusiast fix the OBDII code P155D related to the Hill Descent Control system in a 2016 GMC Sierra?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the specific cause of the P155D code may require professional expertise and specialized equipment.

9. How much does it typically cost to repair the OBDII code P155D in a 2016 GMC Sierra at a dealership or repair shop?

- The cost of repairing the OBDII code P155D can vary depending on the exact cause of the issue. It is recommended to obtain a diagnostic assessment from a dealership or repair shop to get an accurate estimate.

10. Can weather or terrain conditions impact the appearance of the OBDII code P155D in a 2016 GMC Sierra?

- Extreme weather or challenging terrain conditions may exacerbate existing issues related to the Hill Descent Control system, potentially triggering the OBDII code P155D. Regular maintenance and inspections can help prevent such occurrences.

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