AutoCodes – Chevrolet – U1803 2014 Chevrolet Silverado

U1803 2014 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 2014 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 402

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
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Code U1803 2014 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 2014 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U1803 2014 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 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the U1803 2014 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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1803 in a 2014 Chevrolet Silverado?

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

2. What can cause the OBDII code U1803 to appear in a 2014 Chevrolet Silverado?

- The code U1803 often indicates a communication problem between the vehicle's onboard diagnostics system and the hybrid/EV powertrain control module 2. This can be caused by wiring issues, a faulty control module, or software glitches.

3. How can I diagnose the issue related to the U1803 code in my 2014 Chevrolet Silverado?

- To diagnose the U1803 code, a technician will typically perform a thorough inspection of the wiring connections between the onboard diagnostics system and the hybrid/EV powertrain control module 2. They may also use a diagnostic scanner to retrieve specific trouble codes and data.

4. Are there any DIY repair tips for addressing the U1803 code in a 2014 Chevrolet Silverado?

- DIY repair for the U1803 code may be challenging due to the complexity of the hybrid/EV powertrain control module communication system. It is recommended to consult a professional technician with experience in hybrid vehicle diagnostics for proper repair.

5. Can I still drive my 2014 Chevrolet Silverado with the U1803 code present?

- While the vehicle may still be operable with the U1803 code, it is not recommended to ignore the issue. Continuing to drive the vehicle with unresolved communication problems can potentially lead to further damage or drivability issues.

6. How much does it typically cost to repair the U1803 code in a 2014 Chevrolet Silverado?

- The cost of repairing the U1803 code can vary depending on the underlying cause of the communication issue. It is advisable to obtain a diagnostic assessment from a qualified technician to receive an accurate repair estimate.

7. Is the U1803 code specific to the 2014 Chevrolet Silverado, or can it appear in other vehicle models?

- The U1803 code is not exclusive to the 2014 Chevrolet Silverado and can potentially appear in other vehicle models equipped with a hybrid or electric powertrain control module. The specific troubleshooting steps may vary by vehicle make and model.

8. Will resetting the check engine light resolve the U1803 code in a 2014 Chevrolet Silverado?

- Simply resetting the check engine light may temporarily clear the code, but it will not address the underlying communication issue causing the U1803 code. It is recommended to diagnose and repair the root cause of the problem to prevent future occurrences.

9. Can extreme weather conditions affect the occurrence of the U1803 code in a 2014 Chevrolet Silverado?

- Extreme weather conditions, such as temperature fluctuations or humidity, can potentially impact the electrical connections and communication systems in a vehicle, leading to intermittent issues like the U1803 code. It is important to keep the vehicle properly maintained to mitigate such effects.

10. Is the U1803 code related to the safety of driving a 2014 Chevrolet Silverado?

- While the U1803 code itself may not directly affect the safety of driving the vehicle, communication problems with critical control modules like the hybrid/EV powertrain module can impact overall performance and efficiency. It is advisable to address the issue promptly to ensure optimal vehicle operation.