U1803 2017 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2
Quick Answer
The U1803 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. Common causes include Faulty Wiring: Damaged or loose wiring connections can disrupt communication between the vehicle's computer system and the Hybrid/EV Powertrain Control Module 2, Communication Line Issues: Problems with the communication lines connecting the modules can prevent data transmission, Module Malfunction: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication errors. 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 Wiring: Damaged or loose wiring connections can disrupt communication between the vehicle's computer system and the Hybrid/EV Powertrain Control Module 2, Communication Line Issues: Problems with the communication lines connecting the modules can prevent data transmission, Module Malfunction: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication errors.
- 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 U1803 2017 GMC Sierra Description
The U1803 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. This module is responsible for managing the hybrid or electric powertrain system in the vehicle. When communication is lost with this module, it can lead to a variety of performance issues and potentially impact the overall functionality of the hybrid or electric powertrain system.
Common Causes of U1803 2017 GMC Sierra
- Faulty Wiring: Damaged or loose wiring connections can disrupt communication between the vehicle's computer system and the Hybrid/EV Powertrain Control Module 2.
- Communication Line Issues: Problems with the communication lines connecting the modules can prevent data transmission.
- Module Malfunction: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication errors.
- Software Glitch: Occasionally, a software glitch in the vehicle's computer system can lead to communication issues.
Symptoms of U1803 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Power: The vehicle may experience a loss of power or reduced performance when driving.
- Poor Fuel Efficiency: A communication issue with the Hybrid/EV Powertrain Control Module 2 can lead to decreased fuel efficiency.
- Inability to Start: In severe cases, the vehicle may not start or may have difficulty starting due to the communication problem.
How to Fix U1803 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and pinpoint the source of the communication problem.
- Inspect Wiring and Connections: Check for any damaged or loose wiring connections and repair or replace them as needed.
- Test Communication Lines: Verify the integrity of the communication lines between the modules and address any issues found.
- Replace Module: If the Hybrid/EV Powertrain Control Module 2 is found to be faulty, it may need to be replaced with a new unit.
- Clear Codes and Test: After completing the repairs, clear the trouble codes from the vehicle's computer system and test to ensure that the communication issue has been resolved.
Cost to Fix U1803 2017 GMC Sierra
The typical repair costs for addressing a U1803 code on a 2017 GMC Sierra can vary depending on the specific cause of the communication issue. In general, the cost of parts for this repair can range from $200 to $800, with labor costs adding an additional $100 to $300. However, it is important to note that the actual cost of repairs can vary based on factors such as location, vehicle make and model, and the rates charged by individual auto repair shops. It is recommended to obtain quotes from local shops to get a more accurate estimate for this repair. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates.
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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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