AutoCodes – Chevrolet – U1301 Chevrolet

U1301 Chevrolet Code - High Voltage On Class 2 Serial Data Circuit

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Repair other code first. 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: U1301 Chevrolet indicates High Voltage On Class 2 Serial Data Circuit.
Common causes: Common causes include Repair other code first.
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 22,896

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 Nov 27, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1301 Chevrolet Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. When the module detects one of the following conditions on the class 2 serial data circuit for approximately 3 seconds, the setting of all other class 2 serial communication Diagnostic Trouble Code (DTC) is inhibited and a DTC will set.

OBDII Code U1301 Chevrolet - High Voltage On Class 2 Serial Data Circuit - AutoCodes.com — U1301 Chevrolet Code - High Voltage On Class 2 Serial Data Circuit

What does this mean?

What are the Possible Causes of the DTC U1301 Chevrolet?

Repair other code first

How to Fix the DTC U1301 Chevrolet?

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

In most cases, the U1301 code is combined with other codes, fix other codes first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1301 Chevrolet 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 U1301 Chevrolet code?

Need more information on how to fix the U1301 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1301 Chevrolet 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 U1301 Chevrolet Code

1. What are the common symptoms of OBDII code U1301 in a Chevrolet?

The common symptoms include issues with the vehicle's communication system, such as loss of communication with various control modules, erratic behavior of gauges and lights, and difficulty accessing certain vehicle functions.

2. What can cause the OBDII code U1301 in a Chevrolet?

The U1301 code in a Chevrolet is typically caused by high voltage on the Class 2 serial data circuit, which can be a result of damaged wiring, faulty connectors, or a malfunctioning control module.

3. How can I diagnose the OBDII code U1301 in my Chevrolet?

Diagnosing the U1301 code involves using a diagnostic scanner to retrieve the code and then performing a thorough inspection of the Class 2 serial data circuit, checking for damaged wiring, loose connections, or faulty control modules.

4. Can a DIYer repair the OBDII code U1301 in a Chevrolet?

While diagnosing the U1301 code may be possible for a DIYer with some automotive knowledge and the right tools, repairing the issue may require professional expertise to accurately identify and fix the root cause.

5. Are there any quick fixes for the OBDII code U1301 in a Chevrolet?

Quick fixes for the U1301 code are generally not recommended, as addressing the underlying high voltage issue on the Class 2 serial data circuit is crucial to prevent further damage to the vehicle's communication system.

6. How much does it cost to repair the OBDII code U1301 in a Chevrolet?

The cost of repairing the U1301 code in a Chevrolet can vary depending on the extent of the damage, the parts needed for replacement, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

7. Can driving with the OBDII code U1301 in a Chevrolet cause further damage?

Continuing to drive with the U1301 code present in a Chevrolet can potentially cause further damage to the vehicle's communication system, leading to more complex and expensive repairs in the future.

8. Will resetting the OBDII code U1301 in a Chevrolet make it go away permanently?

Simply resetting the U1301 code in a Chevrolet without addressing the underlying high voltage issue on the Class 2 serial data circuit will not make it go away permanently, as the problem will likely resurface.

9. How long does it typically take to repair the OBDII code U1301 in a Chevrolet?

The repair time for the U1301 code in a Chevrolet can vary depending on the complexity of the issue and the availability of parts. It is best to consult with a professional mechanic for a more accurate timeline.

10. Is the OBDII code U1301 in a Chevrolet a common issue?

The U1301 code related to high voltage on the Class 2 serial data circuit is a relatively common issue in Chevrolet vehicles, particularly in older models or those with high mileage. Regular maintenance and inspections can help prevent this code from occurring.