AutoCodes – Chevrolet – U1817 2017 Chevrolet Silverado

U1817 2017 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 2017 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 210

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 2017 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 2017 Chevrolet Silverado - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction - AutoCodes.com — U1817 2017 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 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1817 in a 2017 Chevrolet Silverado?

The common symptoms include the check engine light illuminating, transmission issues, loss of power, and possible inability to start the vehicle.

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

This code indicates that there is a communication problem between the hybrid powertrain control module and the powertrain expansion CAN bus in the vehicle.

3. What are the possible causes of OBDII code U1817 in a 2017 Chevrolet Silverado?

Possible causes include faulty wiring or connections, a malfunctioning hybrid powertrain control module, issues with the powertrain expansion CAN bus, or a software glitch.

4. How can I diagnose the OBDII code U1817 in my 2017 Chevrolet Silverado?

Diagnosis involves checking the wiring and connections related to the hybrid powertrain control module and powertrain expansion CAN bus, inspecting the modules themselves, and using a scan tool to gather more specific information.

5. What are some repair tips for fixing OBDII code U1817 in a 2017 Chevrolet Silverado?

Repair tips include checking and repairing any damaged wiring or connections, replacing the hybrid powertrain control module if necessary, reprogramming modules if a software issue is suspected, and clearing the code after repairs are made.

6. Can I drive my 2017 Chevrolet Silverado with OBDII code U1817 present?

It is not recommended to drive the vehicle with this code present, as it can lead to potential drivability issues and further damage if not addressed promptly.

7. Is OBDII code U1817 in a 2017 Chevrolet Silverado easy to fix at home?

Depending on the underlying cause, fixing this code at home may be challenging, especially if it involves module replacement or reprogramming. Basic checks like inspecting wiring can be done at home.

8. How much does it cost to repair OBDII code U1817 in a 2017 Chevrolet Silverado?

The cost of repairs can vary widely depending on the exact cause of the issue. Simple fixes like repairing wiring may be relatively affordable, while module replacement or reprogramming can be more expensive.

9. Can a faulty battery or charging system cause OBDII code U1817 in a 2017 Chevrolet Silverado?

While it is less common, issues with the battery or charging system could potentially disrupt communication and trigger this code, so it's worth checking these components during diagnosis.

10. Will disconnecting the battery reset OBDII code U1817 in my 2017 Chevrolet Silverado?

Disconnecting the battery may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after driving the vehicle again. It's best to diagnose and fix the root cause of the problem.