AutoCodes – Chevrolet – U0020 2017 Chevrolet Silverado

U0020 2017 Chevrolet Silverado Code - Low Speed CAN Bus

Quick Answer

Devices connected to the General Motors Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include If other codes are present, diagnose other codes first, Faulty Control Module, Control Module harness is open or shorted. 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: U0020 2017 Chevrolet Silverado indicates Low Speed CAN Bus.
Common causes: Common causes include If other codes are present, diagnose other codes first, Faulty Control Module, Control Module harness is open or shorted.
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 276

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 19, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0020 2017 Chevrolet Silverado Description

Devices connected to the General Motors Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages need to be exchanged on the serial data circuits. The messages are also supervised, and some periodic messages are used by the receiver device as an availability indication of the transmitter device. The Diagnostic Trouble Code (DTC) will be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0020 2017 Chevrolet Silverado - Low Speed CAN Bus - AutoCodes.com — U0020 2017 Chevrolet Silverado Code - Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U0020 2017 Chevrolet Silverado?

If other codes are present, diagnose other codes first
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0020 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 does this mean?

Code Tech Notes

Controller Area Network (CAN)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0020 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 U0020 2017 Chevrolet Silverado code?

Need more information on how to fix the U0020 2017 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 U0020 2017 Chevrolet Silverado Code

1. What does the OBDII code U0020 mean for a 2017 Chevrolet Silverado?

The code U0020 indicates a problem with the Low Speed Controller Area Network (CAN) Bus in the vehicle.

2. What are common symptoms of a U0020 code in a 2017 Chevrolet Silverado?

Common symptoms include issues with the vehicle's communication systems, such as intermittent or complete loss of communication with various control modules.

3. What are possible causes of the U0020 code in a 2017 Chevrolet Silverado?

Potential causes include damaged wiring or connectors in the Low Speed CAN Bus circuit, faulty control modules, or issues with the CAN Bus network itself.

4. How can I diagnose the U0020 code in my 2017 Chevrolet Silverado?

Diagnosis typically involves using a professional OBDII scanner to read the code and perform further testing to pinpoint the exact cause, such as checking the wiring, connectors, and control modules associated with the Low Speed CAN Bus.

5. Can I still drive my 2017 Chevrolet Silverado with a U0020 code?

It is not recommended to drive the vehicle with an unresolved U0020 code, as it can lead to potential safety hazards and further damage to the vehicle's systems.

6. How can the U0020 code in a 2017 Chevrolet Silverado be repaired?

Repairing the U0020 code often involves fixing any damaged wiring or connectors, replacing faulty control modules, or addressing issues within the CAN Bus network. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Are there any DIY tips for addressing a U0020 code in a 2017 Chevrolet Silverado?

While some basic troubleshooting steps can be taken, such as checking for loose connections or damaged wiring, complex repairs related to the U0020 code are best left to experienced professionals due to the intricacies of the vehicle's communication systems.

8. How much does it cost to fix a U0020 code in a 2017 Chevrolet Silverado?

The cost of fixing a U0020 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to obtain quotes from reputable auto repair shops for an accurate estimate.

9. Can a U0020 code in a 2017 Chevrolet Silverado cause other problems if left untreated?

Yes, leaving a U0020 code unresolved can potentially lead to further malfunctions in the vehicle's communication systems and control modules, impacting the overall performance and safety of the vehicle.

10. Is the U0020 code common in 2017 Chevrolet Silverado vehicles?

While the U0020 code may not be as common as some other OBDII codes, issues related to the Low Speed CAN Bus can occur in various vehicle models, including the 2017 Chevrolet Silverado.