AutoCodes – Chevrolet – U1803 2015 Chevrolet Silverado

U1803 2015 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 2015 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 201

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1803 2015 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 2015 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U1803 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the U1803 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1803 2015 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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1803 in a 2015 Chevrolet Silverado?

- Common symptoms include the check engine light illuminating, difficulty starting the vehicle, or issues with powertrain performance.

2. What does the OBDII code U1803 "Lost Communication with Hybrid/EV Powertrain Control Module 2" mean for a 2015 Chevrolet Silverado?

- This code indicates a communication problem between the vehicle's onboard computer system and the Hybrid/EV Powertrain Control Module 2.

3. What are possible causes of OBDII code U1803 in a 2015 Chevrolet Silverado?

- Potential causes include wiring issues, loose connections, a faulty powertrain control module, or software glitches.

4. How can I diagnose the OBDII code U1803 in my 2015 Chevrolet Silverado?

- Diagnosing the code typically involves checking the wiring and connections to the Hybrid/EV Powertrain Control Module 2, as well as using a diagnostic scanner to retrieve more specific information.

5. Can I still drive my 2015 Chevrolet Silverado with the U1803 code present?

- It is not recommended to drive the vehicle with the U1803 code active, as it can affect the performance and safety of the powertrain system.

6. How can I reset the OBDII code U1803 in a 2015 Chevrolet Silverado?

- Resetting the code usually involves fixing the underlying issue causing the communication error, then using a diagnostic scanner to clear the code from the vehicle's computer system.

7. Are there any simple repairs I can try for the U1803 code in my 2015 Chevrolet Silverado?

- Simple repairs may include checking and securing wiring connections, ensuring proper grounding, and inspecting for any visible damage.

8. Is it necessary to take my 2015 Chevrolet Silverado to a dealership for the U1803 code repair?

- While a dealership may have specialized knowledge and tools, independent repair shops with experience in hybrid and electric vehicles can also diagnose and repair the issue.

9. How much does it typically cost to repair the U1803 code in a 2015 Chevrolet Silverado?

- Repair costs can vary depending on the root cause of the communication failure, but expect to pay for diagnostic time, parts replacement (if necessary), and labor.

10. Can the U1803 code in a 2015 Chevrolet Silverado reoccur after being repaired?

- If the underlying issue causing the communication problem is not properly addressed, the U1803 code may reappear. Ensure all repairs are completed thoroughly to prevent recurrence.