U1803 2017 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2
Quick Answer
The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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
- U1803 2017 GMC Sierra indicates Lost Communication with Hybrid/EV Powertrain Control Module 2.
- Common causes
- Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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 U1803 2017 GMC Sierra Description
What are the Possible Causes of the DTC U1803 2017 GMC Sierra?
- Faulty Hybrid/EV Powertrain Control Module 2
- Hybrid/EV Powertrain Control Module 2 harness is open or shorted
- Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection
How to Fix the DTC U1803 2017 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 U1803 2017 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 U1803 2017 GMC Sierra Code
1. What does the OBDII code U1803 mean on a 2017 GMC Sierra?
The U1803 code indicates a lost communication issue with the Hybrid/EV Powertrain Control Module 2, meaning the module is not receiving or sending data properly.
2. What are the common symptoms of the U1803 code in a 2017 GMC Sierra?
Symptoms may include warning lights on the dashboard (e.g., the check engine light), reduced engine performance, or erratic transmission behavior.
3. What causes the U1803 code to appear on a 2017 GMC Sierra?
Common causes include faulty wiring or connectors, a malfunctioning powertrain control module, or issues with the CAN (Controller Area Network) communication system.
4. How can I diagnose the U1803 code on my 2017 GMC Sierra?
Start by inspecting the wiring and connectors for damage or corrosion. Use a scan tool to check for other related codes and test the communication network.
5. Can a dead battery trigger the U1803 code in a 2017 GMC Sierra?
Yes, a low or dead battery can disrupt communication between modules and potentially trigger the U1803 code.
6. Is it safe to drive my 2017 GMC Sierra with the U1803 code?
It’s not recommended, as this code can indicate issues with critical systems that may affect performance or safety.
7. How do I fix the U1803 code on a 2017 GMC Sierra?
Repairs may include replacing damaged wiring, securing loose connectors, updating module software, or replacing the faulty powertrain control module if necessary.
8. What tools are needed to troubleshoot the U1803 code on a 2017 GMC Sierra?
You’ll need a diagnostic scan tool capable of reading manufacturer-specific codes, a multimeter for testing electrical connections, and possibly a wiring diagram for the vehicle.
9. Does the U1803 code always mean the Powertrain Control Module 2 is bad?
Not always. The issue could be with the wiring, connectors, or communication network rather than the module itself.
10. Can a software update resolve the U1803 code on a 2017 GMC Sierra?
In some cases, a software update for the affected module may resolve communication issues and clear the code.
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