U1817 2016 GMC Sierra 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 2016 GMC Sierra 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.
Code U1817 2016 GMC Sierra Description
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.
What are the Possible Causes of the DTC U1817 2016 GMC Sierra?
- 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 2016 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 U1817 2016 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.
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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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