U1817 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code U1817 in a 2014 GMC Sierra?
The common symptoms of U1817 code include the check engine light illuminating, poor vehicle performance, and potential issues with hybrid powertrain control.
2. What does the U1817 code indicate for a 2014 GMC Sierra?
The U1817 code specifically points to a "Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction."
3. What are the possible causes of the U1817 code in a 2014 GMC Sierra?
Potential causes of U1817 code include faulty wiring or connections, issues with the hybrid powertrain control module, or problems with the powertrain expansion CAN bus.
4. How do I diagnose the U1817 code in my 2014 GMC Sierra?
Diagnosing the U1817 code typically involves using an OBDII scanner to read the code, checking for any related codes, inspecting the wiring and connections, and testing the hybrid powertrain control module.
5. Can I still drive my 2014 GMC Sierra with the U1817 code present?
It's not recommended to drive your vehicle with the U1817 code active, as it can lead to performance issues and potential safety concerns related to the hybrid powertrain control.
6. How can I repair the U1817 code in my 2014 GMC Sierra?
Repairing the U1817 code may involve fixing any wiring or connection issues, replacing the hybrid powertrain control module if necessary, or addressing problems with the powertrain expansion CAN bus.
7. Is it expensive to fix the U1817 code in a 2014 GMC Sierra?
The cost of fixing the U1817 code can vary depending on the exact cause of the issue. It's advisable to consult a professional mechanic for an accurate diagnosis and repair estimate.
8. Can the U1817 code be triggered by a simple electrical glitch?
Yes, the U1817 code can sometimes be triggered by a temporary electrical glitch. In such cases, clearing the code and monitoring the vehicle may resolve the issue.
9. Will resetting the U1817 code make it go away permanently?
Simply resetting the U1817 code may not make it go away permanently if the underlying issue is not addressed. It's crucial to diagnose and repair the root cause of the problem.
10. How soon should I address the U1817 code in my 2014 GMC Sierra?
It's recommended to address the U1817 code promptly to prevent any further damage to the hybrid powertrain system and ensure the safe operation of your vehicle.
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