AutoCodes – Chevrolet – U1817 2015 Chevrolet Silverado

U1817 2015 Chevrolet Silverado Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Quick Answer

Devices connected to the powertrain high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator 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: U1817 2015 Chevrolet Silverado indicates Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction.
Common causes: Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator 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 192

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1817 2015 Chevrolet Silverado Description

Devices connected to the powertrain high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
The Motor Control Module and the Hybrid Powertrain Control Module are all internal to the Starter/Generator Control Module. All circuits to the Hybrid Powertrain Control Module are also internal to the Starter/Generator Control Module.
Communication diagnostics for the serial data, including device power and ground as well as the wakeup circuits for the Motor Control Module and the Hybrid Powertrain Control Module are all diagnosed from external sources only to the Starter/Generator Control Module connector because any circuit fault condition within the Starter/Generator Control Module will cause a complete replacement.
The Diagnostic Trouble Code (DTC) will be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1817 2015 Chevrolet Silverado - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction - AutoCodes.com — U1817 2015 Chevrolet Silverado Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

What does this mean?

What are the Possible Causes of the DTC U1817 2015 Chevrolet Silverado?

Faulty Starter/Generator Control Module
Starter/Generator Control Module harness is open or shorted
Starter/Generator Control Module circuit poor electrical connection

How to Fix the DTC U1817 2015 Chevrolet Silverado?

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 U1817 2015 Chevrolet Silverado 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 U1817 2015 Chevrolet Silverado 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 U1817 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1817 on a 2015 Chevrolet Silverado?

- Common symptoms include the check engine light illuminating, poor vehicle performance, and potential issues with the hybrid powertrain system.

2. What does the OBDII code U1817 "Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction" mean?

- This code indicates a communication problem between the vehicle's onboard diagnostic system and the hybrid powertrain control module on the powertrain expansion CAN bus.

3. What are the possible causes of the U1817 code on a 2015 Chevrolet Silverado?

- Potential causes include damaged wiring or connectors, a faulty hybrid powertrain control module, software issues, or problems with the powertrain expansion CAN bus.

4. How can I diagnose the U1817 code on my 2015 Chevrolet Silverado?

- Diagnosis typically involves inspecting the wiring and connectors for damage, checking the hybrid powertrain control module, and using a diagnostic scanner to analyze communication on the powertrain expansion CAN bus.

5. What are some tips for repairing the U1817 code on a 2015 Chevrolet Silverado?

- Repair tips may include repairing or replacing damaged wiring or connectors, reprogramming the hybrid powertrain control module, or addressing any issues with the powertrain expansion CAN bus.

6. Is it safe to continue driving with the U1817 code present on a 2015 Chevrolet Silverado?

- It is not recommended to continue driving with this code active, as it may lead to further damage or performance issues with the hybrid powertrain system.

7. Can I reset the U1817 code on my 2015 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code with a diagnostic scanner, it is important to address the root cause to prevent the issue from recurring.

8. How much does it typically cost to repair the U1817 code on a 2015 Chevrolet Silverado?

- Repair costs can vary depending on the exact cause of the issue and the required repairs, but it is advisable to consult a professional for an accurate estimate.

9. Are there any recalls or technical service bulletins related to the U1817 code on the 2015 Chevrolet Silverado?

- It is recommended to check with the manufacturer or a certified dealership to inquire about any relevant recalls or technical service bulletins related to this code.

10. Can a DIY enthusiast with basic automotive knowledge fix the U1817 code on a 2015 Chevrolet Silverado?

- While some basic troubleshooting and repairs may be possible for those with automotive knowledge, complex issues related to hybrid powertrain systems may require professional expertise.