AutoCodes – GMC – P155D 2017 GMC Sierra

P155D 2017 GMC Sierra Code - Hill Descent Control Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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: P155D 2017 GMC Sierra indicates Hill Descent Control Message Counter Incorrect.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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 344

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 P155D 2017 GMC Sierra 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 Hill Descent Control Message Counter is Incorrect.

OBDII Code P155D 2017 GMC Sierra - Hill Descent Control Message Counter Incorrect - AutoCodes.com — P155D 2017 GMC Sierra Code - Hill Descent Control Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P155D 2017 GMC Sierra?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P155D 2017 GMC Sierra?

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 P155D 2017 GMC Sierra 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.

Need more information about the P155D 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

1. What does the OBDII code P155D mean on a 2017 GMC Sierra?

P155D indicates "Hill Descent Control Message Counter Incorrect," suggesting a communication issue between the Hill Descent Control (HDC) system and other vehicle modules.

2. What are the common symptoms of code P155D in a 2017 GMC Sierra?

The most common symptoms include an illuminated check engine light, a malfunctioning Hill Descent Control system, or a "Service Hill Descent Control" message on the dashboard.

3. What causes the P155D code to appear in a 2017 GMC Sierra?

This code is usually caused by faulty communication between the Hill Descent Control module and the powertrain control module (PCM), damaged wiring, or a malfunctioning control module.

4. Can I still drive my 2017 GMC Sierra with the P155D code?

Yes, you can typically drive the vehicle, but the Hill Descent Control system may not function properly, which could be a safety concern on steep or slippery terrain.

5. How can I diagnose the P155D code on a 2017 GMC Sierra?

Start by scanning the vehicle with an OBDII scanner to confirm the code and check for other related codes. Then, inspect the wiring and connectors related to the Hill Descent Control module.

6. What are the repair options for the P155D code in a 2017 GMC Sierra?

Repairs may involve fixing or replacing damaged wiring, reconnecting loose connectors, or reprogramming or replacing the Hill Descent Control module.

7. How much does it cost to fix a P155D code on a 2017 GMC Sierra?

Repair costs can vary widely, from $50 for simple wiring fixes to $500 or more if a module replacement is necessary.

8. Could a weak battery cause the P155D code on a 2017 GMC Sierra?

Yes, low voltage or a weak battery can cause communication errors that might trigger the P155D code.

9. Is the P155D code related to other systems in the 2017 GMC Sierra?

Yes, the Hill Descent Control system communicates with the ABS, traction control, and powertrain control systems, so issues in those systems could potentially contribute to this code.

10. Can clearing the code fix the P155D issue in a 2017 GMC Sierra?

Clearing the code may temporarily remove it, but the underlying issue must be addressed to prevent the code from returning.