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U1817 2016 GMC Sierra Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Quick Answer

The U1817 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a communication error between the vehicle's Hybrid Powertrain Control Module (HPCM) and the Powertrain Expansion Controller Area Network (CAN) bus. Common causes include Faulty Hybrid Powertrain Control Module, Wiring or connection issues in the Powertrain Expansion CAN bus, Corrosion or damage to communication lines. 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
U1817 2016 GMC Sierra indicates Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction.
Common causes
Common causes include Faulty Hybrid Powertrain Control Module, Wiring or connection issues in the Powertrain Expansion CAN bus, Corrosion or damage to communication lines.
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 16, 2024
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Code U1817 2016 GMC Sierra Description

The U1817 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a communication error between the vehicle's Hybrid Powertrain Control Module (HPCM) and the Powertrain Expansion Controller Area Network (CAN) bus. The Hybrid Powertrain Control Module is a crucial component in hybrid vehicles, responsible for managing the interaction between the internal combustion engine and the electric motor. The Powertrain Expansion CAN bus is a communication network that allows various control modules in the vehicle to exchange data.

OBDII Code U1817 2016 GMC Sierra - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction
U1817 2016 GMC Sierra Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Common Causes of U1817 2016 GMC Sierra

  1. Faulty Hybrid Powertrain Control Module
  2. Wiring or connection issues in the Powertrain Expansion CAN bus
  3. Corrosion or damage to communication lines
  4. Software or programming issues in the control modules
  5. Electrical interference or electromagnetic interference affecting communication

Symptoms of U1817 2016 GMC Sierra

  1. Check Engine Light illuminated on the dashboard
  2. Reduced power output or acceleration
  3. Erratic shifting or transmission issues
  4. Hybrid system not engaging or functioning properly
  5. Vehicle entering failsafe mode

How to Fix U1817 2016 GMC Sierra

  1. Perform a comprehensive diagnostic scan to confirm the U1817 code and pinpoint the exact cause of the communication error.
  2. Inspect the wiring harness and connectors related to the Hybrid Powertrain Control Module and Powertrain Expansion CAN bus for any damage, corrosion, or loose connections.
  3. Test the communication lines between the control modules to ensure proper signal transmission.
  4. If necessary, replace the Hybrid Powertrain Control Module or repair any damaged wiring or connectors.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix U1817 2016 GMC Sierra

The cost of repairing a U1817 code on a 2016 GMC Sierra can vary depending on the specific cause of the communication error and the extent of the repairs needed. In general, the cost of parts for a Hybrid Powertrain Control Module replacement can range from $500 to $1500, while labor costs can range from $100 to $300. Overall, the total repair cost for addressing a U1817 code may range from $600 to $1800, including parts and labor. It is advisable to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates and diagnostic fees can vary based on location and service provider.

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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 U1817 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code U1817 on a 2016 GMC Sierra?

The common symptoms of code U1817 include issues with the hybrid powertrain system, reduced fuel efficiency, and potential drivability problems.

2. What does the OBDII code U1817 indicate in a 2016 GMC Sierra?

Code U1817 indicates a communication problem with the hybrid powertrain control module on the Powertrain Expansion CAN Bus.

3. What are the possible causes of a U1817 code on a 2016 GMC Sierra?

Possible causes of code U1817 include wiring issues, faulty connections, a malfunctioning hybrid powertrain control module, or problems with the Powertrain Expansion CAN Bus.

4. How can I diagnose a U1817 code on my 2016 GMC Sierra?

Diagnosing a U1817 code usually involves checking the wiring and connections related to the hybrid powertrain control module, inspecting the module itself, and testing the Powertrain Expansion CAN Bus for faults.

5. Can I drive my 2016 GMC Sierra with a U1817 fault code?

It is not recommended to drive your vehicle with a U1817 fault code as it can lead to further damage to the hybrid powertrain system and potentially affect the vehicle's drivability.

6. How can I repair a U1817 code on my 2016 GMC Sierra?

Repairing a U1817 code may involve fixing wiring issues, repairing faulty connections, replacing the hybrid powertrain control module if necessary, or addressing problems with the Powertrain Expansion CAN Bus.

7. Can a DIY enthusiast fix a U1817 code on a 2016 GMC Sierra?

While diagnosing and repairing a U1817 code may require advanced automotive knowledge and specialized tools, experienced DIY enthusiasts may be able to address certain aspects of the issue, such as checking wiring connections.

8. Is it expensive to repair a U1817 fault code on a 2016 GMC Sierra?

The cost of repairing a U1817 fault code can vary depending on the exact cause of the issue. It is advisable to get a proper diagnosis from a qualified mechanic to determine the repair costs accurately.

9. Can a U1817 fault code on a 2016 GMC Sierra be intermittent?

Yes, a U1817 fault code can sometimes be intermittent, especially if it is caused by loose connections or intermittent wiring issues. It is essential to address the problem promptly to prevent further issues.

10. How long does it typically take to repair a U1817 fault code on a 2016 GMC Sierra?

The repair time for a U1817 fault code can vary based on the specific cause of the issue and the complexity of the repairs needed. It is best to consult with a professional mechanic for an accurate estimate of the repair time.

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