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P155D 2016 Chevrolet Silverado Code - Hill Descent Control Message Counter Incorrect

Quick Answer

The P155D diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a problem with the Hill Descent Control Message Counter being incorrect. Common causes include Faulty sensor in the HDC system, Wiring issues disrupting communication, Software glitch in the vehicle's computer. 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 Chevrolet Silverado indicates Hill Descent Control Message Counter Incorrect.
Common causes
Common causes include Faulty sensor in the HDC system, Wiring issues disrupting communication, Software glitch in the vehicle's computer.
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 P155D 2016 Chevrolet Silverado Description

The P155D diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a problem with the Hill Descent Control Message Counter being incorrect. Hill Descent Control (HDC) is a feature that helps vehicles maintain a steady speed when driving downhill, particularly in off-road or slippery conditions. The HDC system uses sensors to monitor the vehicle's speed, wheel slip, and other parameters to regulate braking and engine output to ensure a safe descent. When the message counter is incorrect, it means that the system is not receiving or processing the necessary data accurately, which can compromise the functionality of the HDC system.

OBDII Code P155D 2016 Chevrolet Silverado - Hill Descent Control Message Counter Incorrect
P155D 2016 Chevrolet Silverado Code - Hill Descent Control Message Counter Incorrect

Common Causes of P155D 2016 Chevrolet Silverado

  1. Faulty sensor in the HDC system
  2. Wiring issues disrupting communication
  3. Software glitch in the vehicle's computer
  4. Malfunctioning HDC module
  5. Corrosion or damage to electrical connections related to the HDC system

Symptoms of P155D 2016 Chevrolet Silverado

  1. HDC system not engaging when driving downhill
  2. Inconsistent or erratic speed control on descents
  3. Warning light illuminated on the dashboard related to HDC
  4. Vehicle struggling to maintain traction on steep slopes
  5. Increased brake wear due to manual braking required on descents

How to Fix P155D 2016 Chevrolet Silverado

  1. Diagnose the issue using a scan tool to retrieve the specific trouble code and identify the root cause of the problem.
  2. Inspect the HDC sensors, wiring, and connections for any visible damage or corrosion.
  3. Test the HDC module for proper functionality and communication with the vehicle's computer.
  4. Repair or replace faulty sensors, wiring, or components as needed to restore proper operation of the HDC system.
  5. Clear the trouble code from the vehicle's computer and perform a test drive to ensure the issue is resolved.

Cost to Fix P155D 2016 Chevrolet Silverado

The cost of repairing a P155D code on a 2016 Chevrolet Silverado can vary depending on the extent of the issue and the specific components that need to be replaced. As a rough estimate, the repair costs for this issue could range from $200 to $500, including parts and labor. However, actual costs may vary based on the technician's hourly labor rate, the price of replacement parts, and any additional diagnostic or repair services required. It's recommended to consult with a reputable auto repair shop for a more accurate cost estimate based on the individual circumstances of the vehicle.

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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 Chevrolet Silverado Code

1. What does OBDII code P155D mean for a 2016 Chevrolet Silverado?

Code P155D indicates that the Hill Descent Control (HDC) system has detected an incorrect counter message, which suggests an issue in the communication between control modules or with the HDC system.

2. What are the symptoms of code P155D in a 2016 Chevrolet Silverado?

Common symptoms include the Hill Descent Control system not engaging, an illuminated check engine light, or a warning message about the HDC system on the dashboard.

3. What causes code P155D in a 2016 Chevrolet Silverado?

The code can be caused by faulty communication between the Electronic Brake Control Module (EBCM) and other modules, software issues, damaged wiring, or a malfunctioning sensor related to the Hill Descent Control system.

4. Is it safe to drive a 2016 Chevrolet Silverado with code P155D?

While the vehicle may remain drivable, the Hill Descent Control system may be inoperative, which could pose a safety risk when driving on steep declines.

5. How is code P155D diagnosed in a 2016 Chevrolet Silverado?

A technician will use a scan tool to check for related diagnostic trouble codes, inspect wiring and connectors, and test communication between the modules involved in the HDC system.

6. Can a software update fix code P155D on a 2016 Chevrolet Silverado?

Yes, in some cases, the issue may be resolved with a software update to the control module if the problem is related to outdated programming.

7. What parts might need to be replaced to fix code P155D?

Potential repairs could involve replacing the Electronic Brake Control Module (EBCM), repairing or replacing damaged wiring, or replacing sensors associated with the HDC system.

8. How much does it cost to fix code P155D on a 2016 Chevrolet Silverado?

The repair cost can vary widely depending on the root cause. Software updates or minor wiring repairs may cost under $200, while module replacements could exceed $1,000.

9. Can I reset code P155D without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the warning, but the issue is likely to return and could impact vehicle safety.

10. What preventative maintenance can help avoid code P155D?

Regularly inspect wiring and connectors for damage, ensure control module software is up-to-date, and have your braking and HDC systems checked during routine maintenance.

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