AutoCodes – Chevrolet – U1300 Chevrolet

U1300 Chevrolet Code - Low 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: U1300 Chevrolet indicates Low 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 18,067

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 U1300 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 U1300 Chevrolet - Low Voltage On Class 2 Serial Data Circuit - AutoCodes.com — U1300 Chevrolet Code - Low Voltage On Class 2 Serial Data Circuit

What does this mean?

What are the Possible Causes of the DTC U1300 Chevrolet?

Repair other code first

How to Fix the DTC U1300 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 U1300 code is combined with other codes, fix other codes first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1300 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 U1300 Chevrolet code?

Need more information on how to fix the U1300 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1300 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 U1300 Chevrolet Code

1. What does the OBDII code U1300 mean on a Chevrolet?

The U1300 code indicates "Low Voltage On Class 2 Serial Data Circuit," meaning there is a communication issue due to a low voltage signal in the vehicle's data network.

2. What are common symptoms of the U1300 code on a Chevrolet?

Symptoms may include warning lights on the dashboard, intermittent electrical issues, communication errors with modules, or systems like ABS or traction control malfunctioning.

3. What causes the U1300 code on a Chevrolet?

Common causes include damaged wiring, corroded connectors, a faulty module on the Class 2 data circuit, or a short to ground in the communication network.

4. Can a dead battery cause the U1300 code on a Chevrolet?

Yes, a weak or dead battery can cause low voltage on the Class 2 serial data circuit, leading to the U1300 code.

5. How do I diagnose the U1300 code on a Chevrolet?

Start by inspecting the wiring and connectors for damage or corrosion, check for shorts to ground, and use a scan tool to identify which module is not communicating properly.

6. Can I drive my Chevrolet with the U1300 code?

Driving may be possible, but itâ€™s not recommended as the code can affect critical systems like brakes or stability control, compromising safety.

7. How do I fix the U1300 code on a Chevrolet?

Repairs may include cleaning or replacing corroded connectors, repairing damaged wiring, replacing a faulty module, or addressing any battery or power supply issues.

8. How much does it cost to repair the U1300 code on a Chevrolet?

The cost depends on the root cause, ranging from $50 for minor wiring repairs to $500 or more if a module needs replacement.

9. Can a bad ground connection trigger the U1300 code on a Chevrolet?

Yes, a poor ground connection can cause low voltage in the Class 2 data circuit, potentially triggering the U1300 code.

10. Is the U1300 code specific to Chevrolet vehicles?

While the code can appear on other GM vehicles, it is most commonly associated with Chevrolet models that use the Class 2 serial data communication network.