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Engine-Codes – GMC – U1301 GMC

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

Quick Answer

The U1301 GMC code indicates that there is a high voltage on the Class 2 Serial Data Circuit in the vehicle. Common causes include Short circuit in the wiring harness, Faulty module sending high voltage signals, Malfunctioning ground connection. 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 Short circuit in the wiring harness, Faulty module sending high voltage signals, Malfunctioning ground connection.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code U1301 GMC Description

The U1301 GMC code indicates that there is a high voltage on the Class 2 Serial Data Circuit in the vehicle. The Class 2 Serial Data Circuit is a communication network in the vehicle that allows various modules and components to communicate with each other. When there is high voltage on this circuit, it can disrupt the communication between these modules and components, leading to issues with the vehicle's performance.

OBDII Code U1301 GMC - High Voltage On Class 2 Serial Data Circuit
U1301 GMC Code - High Voltage On Class 2 Serial Data Circuit

Common Causes of U1301 GMC

  1. Short circuit in the wiring harness
  2. Faulty module sending high voltage signals
  3. Malfunctioning ground connection
  4. Water damage to the wiring or modules
  5. Corrosion on the connectors of the Class 2 Serial Data Circuit

Symptoms of U1301 GMC

  1. Dashboard warning lights illuminated
  2. Loss of power steering assistance
  3. Erratic shifting of gears
  4. Non-functioning airbags
  5. Intermittent or complete loss of communication with diagnostic tools

How to Fix U1301 GMC

  1. Diagnose the issue using a diagnostic scan tool to pinpoint the source of the high voltage on the Class 2 Serial Data Circuit.
  2. Inspect the wiring harness for any signs of damage, such as frayed wires or corrosion, and repair or replace as necessary.
  3. Check the modules connected to the circuit for faults and replace any malfunctioning modules.
  4. Verify the integrity of the ground connections and clean or repair any corroded connections.
  5. Clear the code, reset the vehicle's computer, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U1301 GMC

The cost of repairing a U1301 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $150 to $300. This estimate does not include diagnostic fees, taxes, or any additional parts or services that may be required. As mentioned earlier, it's important to check with local auto repair shops for more accurate pricing based on your location and vehicle.

What does this mean?

Tech Notes for U1301 GMC

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

Need more information about the U1301 GMC 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 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.

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