Engine-Codes.com
Engine-Codes – GMC – U1803 2014 GMC Sierra

U1803 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Quick Answer

The U1803 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. Common causes include Faulty wiring connections, Malfunctioning Hybrid/EV Powertrain Control Module 2, Software glitches or programming 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 2014 GMC Sierra indicates Lost Communication with Hybrid/EV Powertrain Control Module 2.
Common causes
Common causes include Faulty wiring connections, Malfunctioning Hybrid/EV Powertrain Control Module 2, Software glitches or programming 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U1803 2014 GMC Sierra Description

The U1803 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. This module is responsible for controlling various aspects of 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 drivability of the vehicle.

OBDII Code U1803 2014 GMC Sierra - Lost Communication with Hybrid/EV Powertrain Control Module 2
U1803 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Common Causes of U1803 2014 GMC Sierra

  1. Faulty wiring connections
  2. Malfunctioning Hybrid/EV Powertrain Control Module 2
  3. Software glitches or programming errors
  4. Communication network issues within the vehicle
  5. Electrical interference or signal disruption

Symptoms of U1803 2014 GMC Sierra

  1. Loss of power or acceleration
  2. Reduced fuel efficiency
  3. Engine stalling or difficulty starting
  4. Warning lights illuminated on the dashboard
  5. Inability to switch between hybrid or electric power modes

How to Fix U1803 2014 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the U1803 code and identify the specific cause of the communication failure.
  2. Inspect wiring connections and harnesses related to the Hybrid/EV Powertrain Control Module 2 for any damage or corrosion.
  3. Test the Hybrid/EV Powertrain Control Module 2 for proper functionality and communication.
  4. Check for software updates or reprogramming that may address any known issues related to the communication failure.
  5. Clear the DTC and reset the system after completing the repair to ensure the issue is resolved.

Cost to Fix U1803 2014 GMC Sierra

The typical repair costs for addressing a U1803 code on a 2014 GMC Sierra can vary depending on the specific cause of the communication failure. In general, the cost of parts for this repair can range from $200 to $500, while labor costs can range from $100 to $300. However, it's essential to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate before proceeding with the repair.

Need more information about the U1803 2014 GMC Sierra code?

Need more information on how to fix the U1803 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1803 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1803 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code U1803 in a 2014 GMC Sierra?

- Common symptoms include the check engine light illuminating, loss of communication with the hybrid/EV powertrain control module 2, and possible drivability issues.

2. What can cause the U1803 code in a 2014 GMC Sierra?

- The U1803 code is typically triggered when there is a communication fault between the onboard diagnostics system and the hybrid/EV powertrain control module 2.

3. How serious is the U1803 code in a 2014 GMC Sierra?

- The U1803 code can affect the performance and efficiency of the hybrid/EV powertrain system in the vehicle, so it is important to address this issue promptly.

4. What are some possible repair tips for resolving the U1803 code in a 2014 GMC Sierra?

- Check for loose or damaged wiring connections related to the hybrid/EV powertrain control module 2. Perform a diagnostic scan to reset the code and monitor for recurrence.

5. Can the U1803 code be fixed without professional help in a 2014 GMC Sierra?

- While basic checks like inspecting wiring connections can be done by DIY enthusiasts, resolving communication issues with the hybrid/EV powertrain control module 2 may require professional diagnostics and repair.

6. Is it safe to continue driving with the U1803 code present in a 2014 GMC Sierra?

- It is not recommended to ignore the U1803 code, as it could indicate underlying issues with the hybrid/EV powertrain system that may affect the vehicle's performance and safety.

7. How can a mechanic diagnose the U1803 code in a 2014 GMC Sierra?

- A mechanic can use a scan tool to read the trouble code, inspect the wiring harness and connectors, perform a communication test with the hybrid/EV powertrain control module 2, and check for any related software updates.

8. Are there any recalls or technical service bulletins related to the U1803 code in a 2014 GMC Sierra?

- It's advisable to check with the manufacturer or a certified GMC dealership to see if there are any recalls or technical service bulletins addressing the U1803 code specifically for the 2014 GMC Sierra.

9. How much does it typically cost to repair the U1803 code in a 2014 GMC Sierra?

- The cost of repairing the U1803 code can vary depending on the root cause of the communication issue. It is recommended to get a diagnosis from a professional to determine the exact cost.

10. Can the U1803 code reoccur after it has been repaired in a 2014 GMC Sierra?

- If the root cause of the communication issue with the hybrid/EV powertrain control module 2 is not properly addressed during the repair, the U1803 code may reoccur. Regular maintenance and monitoring can help prevent this.

Discuss the causes and fixes for U1803 2014 GMC Sierra OBDII Code

Submit a New Comment

Code U1803 2014 GMC Sierra comments

No comments found for this page.