AutoCodes – GMC – U1301 GMC

U1301 GMC 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 GMC 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 7,679

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

What does this mean?

What are the Possible Causes of the DTC U1301 GMC?

Repair other code first

How to Fix the DTC U1301 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 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 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 U1301 GMC code?

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

Need Help with the Code?

Get the U1301 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 U1301 GMC Code

1. What are the common symptoms of OBDII code U1301 GMC (High Voltage On Class 2 Serial Data Circuit)?

- Common symptoms include issues with various electronic components in the vehicle, such as malfunctioning gauges, warning lights, and communication errors between modules.

2. What are the possible causes of OBDII code U1301 GMC?

- The code U1301 GMC can be triggered by issues such as damaged wiring, loose connections, short circuits, or a faulty module affecting the Class 2 serial data circuit.

3. How can I diagnose OBDII code U1301 GMC?

- Diagnosing this code typically involves using a scan tool to retrieve the code, inspecting the wiring and connectors for any visible damage, and performing continuity and resistance tests to pinpoint the issue.

4. Can a DIYer repair OBDII code U1301 GMC?

- Repairing this code may require advanced electrical knowledge and troubleshooting skills. It is recommended to seek assistance from a professional mechanic or technician familiar with diagnosing and repairing electrical issues.

5. What are some repair tips for resolving OBDII code U1301 GMC?

- Repair tips may include checking and repairing any damaged wiring, securing loose connections, replacing faulty modules, and ensuring proper grounding for the Class 2 serial data circuit.

6. Are there any safety precautions to consider when dealing with OBDII code U1301 GMC?

- Safety precautions include disconnecting the vehicle's battery before performing any electrical work, using insulated tools, and following proper procedures to prevent accidental damage or injury.

7. Can OBDII code U1301 GMC cause further damage if left untreated?

- If left untreated, code U1301 GMC can lead to continued issues with electronic components in the vehicle, potential communication failures between modules, and further damage to the Class 2 serial data circuit.

8. How long does it typically take to repair OBDII code U1301 GMC?

- The repair time for code U1301 GMC can vary depending on the complexity of the issue and the availability of replacement parts. It may take a few hours to a full day to diagnose and repair the problem.

9. Will resetting the OBDII system clear OBDII code U1301 GMC?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing U1301 GMC is not addressed, the code is likely to reappear once the system detects the fault again.

10. Is it safe to drive with OBDII code U1301 GMC illuminated?

- It is generally not recommended to drive with the U1301 GMC code illuminated, as it indicates a problem with the vehicle's electronic systems that could potentially affect safety and performance.