AutoCodes – Chevrolet – U1803 2017 Chevrolet Silverado

U1803 2017 Chevrolet Silverado 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 Chevrolet Silverado 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.

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Code Popularity 185

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1803 2017 Chevrolet Silverado Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Codes (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of health message, detect its absence; those devices in turn set a DTC associated with the loss of state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC.

OBDII Code U1803 2017 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U1803 2017 Chevrolet Silverado Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

What does this mean?

What are the Possible Causes of the DTC U1803 2017 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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.

Need more information about the U1803 2017 Chevrolet Silverado code?

Need more information on how to fix the U1803 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1803 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1803 in a 2017 Chevrolet Silverado?

The common symptoms include dashboard warning lights, loss of power, issues with the hybrid/EV system, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code U1803 in a 2017 Chevrolet Silverado?

The code U1803 typically indicates a communication error with the Hybrid/EV Powertrain Control Module 2, which can be caused by wiring issues, a faulty control module, or software glitches.

3. How can I diagnose OBDII code U1803 in a 2017 Chevrolet Silverado?

Diagnosing this code usually involves checking the wiring connections to the Hybrid/EV Powertrain Control Module 2, inspecting for any physical damage, and using a diagnostic scanner to retrieve more information about the communication error.

4. Can I still drive my 2017 Chevrolet Silverado with OBDII code U1803?

It is not recommended to continue driving the vehicle with this code present, as it may lead to performance issues and potential safety concerns. It's best to address the underlying problem promptly.

5. How can I repair OBDII code U1803 in my 2017 Chevrolet Silverado?

Repairing this code may involve fixing any damaged wiring, replacing the Hybrid/EV Powertrain Control Module 2 if necessary, and clearing the code with a diagnostic tool.

6. Is it safe to reset the OBDII code U1803 in my 2017 Chevrolet Silverado without fixing the underlying issue?

Resetting the code without addressing the root cause may temporarily turn off the warning light, but the problem will likely reoccur. It's essential to fix the underlying issue to prevent further issues.

7. Can a DIY enthusiast fix OBDII code U1803 in a 2017 Chevrolet Silverado?

Depending on your skill level and access to tools, you may be able to address simpler causes like loose connections. However, more complex issues may require professional diagnosis and repair.

8. Will OBDII code U1803 in a 2017 Chevrolet Silverado affect fuel efficiency?

Yes, this code can potentially impact fuel efficiency due to the compromised communication between the control module and other components of the hybrid/EV system.

9. How much does it typically cost to repair OBDII code U1803 in a 2017 Chevrolet Silverado?

The cost of repairing this code can vary widely depending on the exact cause, parts needed, and labor charges. It's advisable to consult a mechanic for a more accurate estimate.

10. Can extreme weather conditions contribute to triggering OBDII code U1803 in a 2017 Chevrolet Silverado?

Extreme weather conditions like intense heat or cold can sometimes affect the wiring and electronic components, potentially leading to communication errors and triggering this OBDII code.