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Engine-Codes – Pontiac – U1305 Pontiac

U1305 Pontiac Code - High Or Low Voltage On Class 2 Serial Data Circuit

Quick Answer

The U1305 diagnostic trouble code (DTC) for Pontiac vehicles refers to a potential issue with the Class 2 serial data circuit experiencing high or low voltage. Common causes include Corroded or damaged wiring in the Class 2 serial data circuit, Loose or poor connections at the connectors, Faulty modules communicating on the circuit. 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
U1305 Pontiac indicates High Or Low Voltage On Class 2 Serial Data Circuit.
Common causes
Common causes include Corroded or damaged wiring in the Class 2 serial data circuit, Loose or poor connections at the connectors, Faulty modules communicating on the circuit.
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 11, 2024
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Code U1305 Pontiac Description

The U1305 diagnostic trouble code (DTC) for Pontiac vehicles refers to a potential issue with the Class 2 serial data circuit experiencing high or low voltage. The Class 2 serial data circuit is a communication network in the vehicle that allows various components and modules to communicate with each other. When the voltage on this circuit is outside of the expected range, it can lead to communication errors between different modules in the vehicle, causing a variety of issues.

OBDII Code U1305 Pontiac - High Or Low Voltage On Class 2 Serial Data Circuit
U1305 Pontiac Code - High Or Low Voltage On Class 2 Serial Data Circuit

Common Causes of U1305 Pontiac

  1. Corroded or damaged wiring in the Class 2 serial data circuit
  2. Loose or poor connections at the connectors
  3. Faulty modules communicating on the circuit
  4. Water intrusion causing shorts in the wiring
  5. Electrical system malfunctions

Symptoms of U1305 Pontiac

  1. Warning lights illuminated on the dashboard
  2. Erratic behavior of gauges or controls
  3. Engine performance issues
  4. Transmission shifting problems
  5. Inoperative HVAC controls

How to Fix U1305 Pontiac

  1. Perform a visual inspection of the wiring, connectors, and modules associated with the Class 2 serial data circuit.
  2. Test the voltage on the circuit to determine if it falls outside the expected range.
  3. Repair or replace any corroded or damaged wiring.
  4. Secure any loose connections at the connectors.
  5. Replace any faulty modules communicating on the circuit.

Cost to Fix U1305 Pontiac

The typical repair costs for addressing a U1305 code on a Pontiac can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, resolving wiring or connector issues may cost between $100 to $300, while replacing faulty modules can range from $200 to $500 or more. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on location and the complexity of the repair. It's advisable to consult with a qualified mechanic for a more accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for U1305 Pontiac

In most cases, the P1305 code is combined with other codes, fix other codes first.

Need more information about the U1305 Pontiac 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 U1305 Pontiac Code

1. What are the common symptoms of OBDII code U1305 on a Pontiac related to high or low voltage on the Class 2 serial data circuit?

The common symptoms include issues with the vehicle's communication systems, such as the radio, instrument cluster, and other electronic modules.

2. What are the possible causes of OBDII code U1305 on a Pontiac indicating high or low voltage on the Class 2 serial data circuit?

Possible causes include loose or corroded wiring connections, a faulty Class 2 serial data circuit, or a malfunctioning electronic control module.

3. How can I diagnose OBDII code U1305 on my Pontiac related to high or low voltage on the Class 2 serial data circuit?

Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring connections for damage or corrosion, and testing the voltage on the Class 2 serial data circuit.

4. What are some repair tips for fixing OBDII code U1305 on a Pontiac due to high or low voltage on the Class 2 serial data circuit?

Repair tips include repairing any damaged wiring connections, replacing faulty electronic control modules, and ensuring all connections are secure and free of corrosion.

5. Can OBDII code U1305 on a Pontiac be reset without fixing the underlying issue of high or low voltage on the Class 2 serial data circuit?

Resetting the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely resurface until the underlying problem is fixed.

6. Are there any safety concerns associated with OBDII code U1305 on a Pontiac related to high or low voltage on the Class 2 serial data circuit?

While this code itself does not pose immediate safety risks, it can affect the proper functioning of critical vehicle systems that rely on the Class 2 serial data circuit for communication.

7. How much does it typically cost to repair OBDII code U1305 on a Pontiac due to high or low voltage on the Class 2 serial data circuit?

Repair costs can vary depending on the specific cause of the issue, but they may range from a simple wiring repair to a more involved module replacement, potentially costing several hundred dollars.

8. Can I continue driving my Pontiac with OBDII code U1305 indicating high or low voltage on the Class 2 serial data circuit?

It is not recommended to continue driving the vehicle with this issue unresolved, as it can lead to further electrical problems and potentially impact the overall performance and safety of the vehicle.

9. Is it possible to prevent OBDII code U1305 from appearing on my Pontiac in the future?

Regular maintenance, including checking and cleaning electrical connections, can help prevent issues like high or low voltage on the Class 2 serial data circuit that may trigger this code.

10. Will fixing OBDII code U1305 on my Pontiac improve fuel efficiency or performance?

While fixing this specific code may not directly impact fuel efficiency or performance, ensuring the proper functioning of the Class 2 serial data circuit can help maintain overall vehicle performance and efficiency.

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