AutoCodes – Chevrolet – U1803 2016 Chevrolet Silverado

U1803 2016 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 2016 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 237

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 2016 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 2016 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U1803 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the U1803 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1803 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1803 in a 2016 Chevrolet Silverado?

The common symptoms include the Check Engine Light illuminating, drivability issues, and the vehicle going into limp mode.

2. What does the OBDII code U1803 "Lost Communication with Hybrid/EV Powertrain Control Module 2" mean for a 2016 Chevrolet Silverado?

This code indicates a communication problem between the onboard diagnostic system and the Hybrid/EV Powertrain Control Module 2 in the vehicle.

3. What are the possible causes of the U1803 code in a 2016 Chevrolet Silverado?

Possible causes include damaged wiring or connectors, a faulty Hybrid/EV Powertrain Control Module 2, software issues, or a weak battery.

4. How can I diagnose the U1803 code in my 2016 Chevrolet Silverado?

Diagnosing the code may involve checking the wiring and connectors for damage, ensuring the battery is in good condition, and using diagnostic tools to communicate with the Hybrid/EV Powertrain Control Module 2.

5. Can I continue driving my 2016 Chevrolet Silverado with the U1803 code?

It is not recommended to drive the vehicle with the U1803 code present, as it can lead to drivability issues and potential safety concerns. It is best to address the issue promptly.

6. How can I reset the U1803 code in my 2016 Chevrolet Silverado?

Resetting the code may involve using an OBDII scanner to clear the code after addressing the underlying issue causing the communication problem.

7. Is the repair for the U1803 code in a 2016 Chevrolet Silverado costly?

The repair cost can vary depending on the exact cause of the communication problem. Simple fixes like repairing wiring may be less expensive compared to replacing the Hybrid/EV Powertrain Control Module 2.

8. Can a DIY enthusiast fix the U1803 code in a 2016 Chevrolet Silverado?

Some aspects of diagnosing and repairing the U1803 code may be within reach of experienced DIY enthusiasts, especially if the issue is related to wiring or connectors. However, complex repairs may require professional assistance.

9. How long does it typically take to repair the U1803 code in a 2016 Chevrolet Silverado?

The repair time can vary based on the specific cause of the code. Simple fixes may be completed relatively quickly, while more involved repairs could take longer, potentially requiring parts ordering and diagnostic time.

10. Is the U1803 code common in 2016 Chevrolet Silverado vehicles?

While the U1803 code may not be one of the most common OBDII codes, it can still occur in 2016 Chevrolet Silverado vehicles due to communication issues between the diagnostic system and the Hybrid/EV Powertrain Control Module 2.