U1817 Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code U1817 for Buick mean?
The code U1817 indicates a Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction in a Buick vehicle.
2. What are the common symptoms of a U1817 code in a Buick?
Common symptoms include the hybrid powertrain not functioning properly, loss of power, warning lights on the dashboard, and possible difficulty starting the vehicle.
3. What are the possible causes of a U1817 code in a Buick?
Possible causes include faulty wiring or connections in the hybrid powertrain system, a malfunctioning Hybrid Powertrain Control Module, issues with the Powertrain Expansion CAN Bus, or a software glitch.
4. How can I diagnose a U1817 code in my Buick?
Diagnosing a U1817 code typically involves using a professional OBDII scanner to retrieve the code, checking the hybrid powertrain components for any visible damage or loose connections, and inspecting the CAN bus system for faults.
5. Can I still drive my Buick with a U1817 code?
It is not recommended to drive your Buick with a U1817 code, as it can lead to further damage to the hybrid powertrain system. It's best to have the vehicle inspected and repaired as soon as possible.
6. How can I repair a U1817 code in my Buick?
Repairing a U1817 code may involve fixing any wiring or connection issues, replacing a faulty Hybrid Powertrain Control Module, addressing problems with the Powertrain Expansion CAN Bus, or updating the software in the system.
7. Is it safe to reset the U1817 code in my Buick and continue driving?
Resetting the code may temporarily clear the warning light, but it won't fix the underlying issue causing the U1817 code. It's important to diagnose and repair the problem before continuing to drive the vehicle.
8. Can a U1817 code be triggered by a dead hybrid battery in a Buick?
Yes, a U1817 code can be triggered by a dead or malfunctioning hybrid battery, as it can disrupt communication between the Hybrid Powertrain Control Module and the Powertrain Expansion CAN Bus.
9. How much does it typically cost to repair a U1817 code in a Buick?
The cost of repairing a U1817 code can vary depending on the specific issue causing the code, the labor rates of the repair shop, and the cost of any replacement parts needed. It's best to get a professional diagnosis to determine the exact cost.
10. Can a DIY enthusiast fix a U1817 code in a Buick?
While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing a U1817 code often requires specialized tools and expertise. It's recommended to consult a professional mechanic for proper diagnosis and repair.
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