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U1817 2017 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 2017 GMC Sierra indicates a "Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction." This code signifies that there is a communication issue between the vehicle's powertrain control module and the hybrid powertrain control module on the powertrain expansion Controller Area Network (CAN) bus. Common causes include Faulty hybrid powertrain control module, Wiring issues or loose connections in the CAN bus network, Software glitches in the control modules. 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 2017 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 issues or loose connections in the CAN bus network, Software glitches in the control modules.
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 U1817 2017 GMC Sierra Description

The U1817 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a "Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction." This code signifies that there is a communication issue between the vehicle's powertrain control module and the hybrid powertrain control module on the powertrain expansion Controller Area Network (CAN) bus. The CAN bus is a network that allows different modules within the vehicle to communicate with each other. When communication is lost, it can lead to various performance issues and potentially affect the vehicle's drivability.

OBDII Code U1817 2017 GMC Sierra - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction
U1817 2017 GMC Sierra Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Common Causes of U1817 2017 GMC Sierra

  1. Faulty hybrid powertrain control module
  2. Wiring issues or loose connections in the CAN bus network
  3. Software glitches in the control modules
  4. Environmental factors causing electromagnetic interference
  5. Physical damage to the control modules or wiring

Symptoms of U1817 2017 GMC Sierra

  1. Reduced fuel efficiency
  2. Loss of power
  3. Transmission shifting issues
  4. Stalling
  5. Check engine light illuminated

How to Fix U1817 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connections in the CAN bus network to identify any loose connections or damage.
  2. Check the hybrid powertrain control module for any signs of malfunction or damage and replace if necessary.
  3. Perform a diagnostic scan to identify any software glitches in the control modules and reprogram or update the software as needed.
  4. Address any environmental factors that may be causing electromagnetic interference by shielding the wiring or relocating components.
  5. Clear the DTC and test drive the vehicle to ensure that the communication issue has been resolved and that the symptoms have been eliminated.

Cost to Fix U1817 2017 GMC Sierra

The typical repair costs for addressing a U1817 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new hybrid powertrain control module and labor for diagnosis and repair can range from $300 to $800. However, it's important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic or dealership to get an accurate estimate for this repair.

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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 2017 GMC Sierra Code

1. What does the OBDII code U1817 mean on a 2017 GMC Sierra?

The U1817 code indicates a loss of communication with the Hybrid Powertrain Control Module on the Powertrain Expansion CAN Bus.

2. What are the common symptoms of the U1817 code?

Symptoms may include a check engine light, reduced engine performance, failure to start, or hybrid system malfunctions.

3. What causes the U1817 code to appear?

Common causes include faulty wiring or connectors, a malfunctioning Hybrid Powertrain Control Module, network communication issues, or a damaged CAN bus line.

4. Can I still drive with the U1817 code active?

Driving with this code is not recommended, as it may lead to reduced performance or prevent the vehicle from operating properly.

5. How is the U1817 code diagnosed?

A technician will use a scan tool to check for communication faults, inspect wiring and connectors, and test the Hybrid Powertrain Control Module for proper function.

6. What repairs are needed to fix the U1817 code?

Repairs may involve replacing damaged wiring, repairing or replacing faulty connectors, or replacing the Hybrid Powertrain Control Module if it is defective.

7. How much does it cost to fix the U1817 code?

Repair costs vary depending on the specific issue but can range from $100 for wiring repairs to over $1,000 if the module needs replacement.

8. Can a weak battery cause the U1817 code?

Yes, a weak or failing 12V or hybrid system battery can sometimes trigger communication issues like the U1817 code.

9. What tools are needed to diagnose the U1817 code?

A professional-grade OBDII scanner capable of reading manufacturer-specific codes and monitoring CAN bus communication is essential.

10. Can the U1817 code clear itself?

The code may clear temporarily if communication is restored, but the underlying issue must be resolved to prevent it from returning.

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