AutoCodes – GMC – U1300 GMC

U1300 GMC 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 GMC 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 9,365

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

What does this mean?

What are the Possible Causes of the DTC U1300 GMC?

Repair other code first

How to Fix the DTC U1300 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the U1300 GMC 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 GMC Code

1. What are the common symptoms of OBDII code U1300 GMC (Low Voltage On Class 2 Serial Data Circuit)?

- Common symptoms include issues with the vehicle's communication systems, such as erratic behavior of dashboard lights, malfunctioning gauges, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code U1300 GMC?

- Possible causes can include a faulty Class 2 serial data circuit, a short circuit in the wiring, a faulty module connected to the data circuit, or a weak electrical connection.

3. How can I diagnose the cause of OBDII code U1300 GMC?

- Using a diagnostic scanner, you can perform a thorough inspection of the wiring, connectors, and modules connected to the Class 2 serial data circuit to identify any faults or issues.

4. Can a DIYer repair OBDII code U1300 GMC?

- While some aspects of diagnosing and repairing this code may be within reach of experienced DIYers, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

5. Is it safe to continue driving with OBDII code U1300 GMC?

- It is generally not recommended to drive the vehicle with this code present, as it can cause further electrical issues and potentially lead to more serious malfunctions.

6. How much does it typically cost to repair OBDII code U1300 GMC?

- The cost of repairing this code can vary depending on the specific underlying issue, but it may range from around $100 for simple fixes to a few hundred dollars for more complex repairs involving module replacements.

7. Are there any preventative measures to avoid OBDII code U1300 GMC?

- Regular maintenance and inspections of the vehicle's electrical systems, including checking for loose connections and ensuring proper wiring, can help prevent issues that may trigger this code.

8. Can extreme weather conditions contribute to triggering OBDII code U1300 GMC?

- Yes, extreme temperatures or weather conditions can sometimes affect the electrical connections and components, potentially leading to the low voltage condition detected by the code.

9. How long does it typically take to repair OBDII code U1300 GMC?

- The repair time can vary depending on the exact cause of the code and the complexity of the repair needed, but it may take anywhere from a few hours to a full day to diagnose and fix the issue.

10. Will resetting the OBDII code U1300 GMC make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue causing the low voltage on the Class 2 serial data circuit is not addressed, the code is likely to reappear.