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Engine-Codes – Generic – U1301

U1301 Code - High Voltage On Class 2 Serial Data Circuit

Quick Answer

The U1301 code indicates that there is high voltage on the Class 2 serial data circuit in the vehicle. Common causes include Short circuit in the wiring harness, Damaged or corroded wiring connections, Faulty control module. 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 indicates High Voltage On Class 2 Serial Data Circuit.
Common causes
Common causes include Short circuit in the wiring harness, Damaged or corroded wiring connections, Faulty control module.
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 06, 2024
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Code U1301 Description

The U1301 code indicates that there is high voltage on the Class 2 serial data circuit in the vehicle. The Class 2 serial data circuit is a communication network used by various control modules in the vehicle to exchange information. High voltage on this circuit can disrupt communication between modules, leading to issues with various systems in the vehicle.

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

Common Causes of U1301

  1. Short circuit in the wiring harness
  2. Damaged or corroded wiring connections
  3. Faulty control module
  4. Electrical interference from aftermarket accessories
  5. Issues with power or ground connections

Symptoms of U1301

  1. Check engine light illuminated
  2. Loss of communication with various control modules
  3. Erratic behavior of vehicle systems
  4. Inability to start the vehicle
  5. Unresponsive dashboard gauges and indicators

How to Fix U1301

  1. Use a multimeter to check for high voltage on the Class 2 serial data circuit.
  2. Inspect the wiring harness for any signs of damage or corrosion.
  3. Check the power and ground connections to ensure they are secure and functioning properly.
  4. Test the control modules for any faults and replace if necessary.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue is resolved.

Cost to Fix U1301

The cost of repairing the U1301 code can vary depending on the specific cause of the issue. In general, the repair could range from $100 to $500, including parts and labor. However, the actual cost may be higher if extensive diagnosis is required or if components need to be replaced. It's recommended to consult with a qualified mechanic for a more accurate estimate based on the individual circumstances of the vehicle.

What does this mean?

Tech Notes for U1301

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

Need more information about the U1301 code?

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Code U1301 Information for Specific Makes

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 Code

1. What does OBDII code U1301 mean?

Code U1301 indicates a high voltage condition on the Class 2 Serial Data Circuit, which is used for communication between vehicle modules.

2. What are common symptoms of code U1301?

Symptoms may include warning lights on the dashboard (like the Check Engine Light), erratic or non-functioning gauges, communication issues between modules, or intermittent electrical problems.

3. What causes code U1301 to be triggered?

Potential causes include a short to voltage in the Class 2 data circuit, a faulty control module, damaged wiring, or poor electrical connections.

4. Can a weak battery cause code U1301?

Yes, a weak or failing battery can cause voltage irregularities that might trigger this code.

5. How do I diagnose code U1301?

Start by inspecting the wiring and connectors in the Class 2 data circuit for damage or corrosion. Use a scan tool to check for additional codes and perform continuity tests on the circuit.

6. Can code U1301 cause drivability issues?

Yes, depending on the affected modules, this code can result in erratic performance, communication failures, or loss of functionality in critical vehicle systems.

7. Is a faulty module a common cause of code U1301?

While possible, a faulty module is less common than damaged wiring or poor connections. Always rule out wiring issues before replacing a module.

8. How can I resolve code U1301?

Repair or replace damaged wiring, clean corroded connectors, and ensure proper grounding. If necessary, replace a faulty module after confirming it as the root cause.

9. Can code U1301 clear itself?

In rare cases, the code may clear temporarily if the issue is intermittent, but the underlying problem must be resolved to prevent its recurrence.

10. Is driving with code U1301 safe?

Driving may be unsafe if critical systems are affected, such as the ABS or power steering. It’s best to address the issue promptly to avoid further complications.

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