AutoCodes – Chevrolet – U1803 2018 Chevrolet Silverado

U1803 2018 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 2018 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 175

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 2018 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 2018 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U1803 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the U1803 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1803 in a 2018 Chevrolet Silverado?

- Common symptoms include loss of communication with Hybrid/EV Powertrain Control Module 2, illuminated warning lights such as the check engine light, and potential drivability issues.

2. What does the OBDII code U1803 "Lost Communication with Hybrid/EV Powertrain Control Module 2" indicate in a 2018 Chevrolet Silverado?

- This code indicates a communication problem between the vehicle's onboard diagnostics system and the Hybrid/EV Powertrain Control Module 2, which can affect the proper functioning of the hybrid powertrain components.

3. What are some possible causes of the U1803 code in a 2018 Chevrolet Silverado?

- Common causes of this code include wiring issues, faulty connectors, a malfunctioning control module, software glitches, or a weak battery affecting communication signals.

4. How can I diagnose the U1803 code in my 2018 Chevrolet Silverado?

- Diagnosis typically involves checking the wiring and connectors related to the Hybrid/EV Powertrain Control Module 2, inspecting for any visible damage, and using a diagnostic scan tool to analyze communication errors.

5. Is it safe to continue driving with the U1803 code in a 2018 Chevrolet Silverado?

- It is not recommended to drive the vehicle with the U1803 code present, as it can lead to potential drivability issues and affect the performance of the hybrid powertrain components.

6. Can I reset the U1803 code in my 2018 Chevrolet Silverado on my own?

- While you can attempt to clear the code using an OBDII scanner, it is recommended to diagnose and address the underlying issue causing the code to prevent it from recurring.

7. How much does it typically cost to repair the U1803 code in a 2018 Chevrolet Silverado?

- Repair costs can vary depending on the exact cause of the communication issue. It is advisable to consult with a professional mechanic to get an accurate estimate for the repair.

8. Are there any DIY tips for fixing the U1803 code in a 2018 Chevrolet Silverado?

- DIY tips may include checking for loose or damaged wiring, ensuring all connectors are securely connected, and performing a battery voltage check to rule out electrical issues.

9. Can a software update resolve the U1803 code issue in a 2018 Chevrolet Silverado?

- In some cases, a software update provided by the manufacturer can address communication issues and resolve the U1803 code. It is advisable to consult with a dealership or qualified technician for this solution.

10. How long does it take to repair the U1803 code in a 2018 Chevrolet Silverado?

- The repair time can vary based on the exact cause of the issue. Simple fixes like reconnecting a loose wire may take a short time, while more complex issues may require more extensive troubleshooting and repair, leading to a longer repair time.