AutoCodes – Buick – U1305 Buick

U1305 Buick Code - High Or 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: U1305 Buick indicates High Or 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 1,474

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 May 16, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1305 Buick 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 U1305 Buick - High Or Low Voltage On Class 2 Serial Data Circuit - AutoCodes.com — U1305 Buick Code - High Or Low Voltage On Class 2 Serial Data Circuit

What does this mean?

What are the Possible Causes of the DTC U1305 Buick?

Repair other code first

How to Fix the DTC U1305 Buick?

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 P1305 code is combined with other codes, fix other codes first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1305 Buick 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 U1305 Buick code?

Need more information on how to fix the U1305 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1305 Buick 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 U1305 Buick Code

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

The common symptoms include issues with communication between vehicle modules, dashboard warning lights, erratic gauge behavior, and problems with various vehicle systems.

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

Possible causes include faulty wiring or connections in the Class 2 serial data circuit, a malfunctioning body control module (BCM), a defective powertrain control module (PCM), or a problem with other control modules on the network.

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

Diagnosis involves using a scan tool to check for communication errors between modules, inspecting wiring and connections for damage, testing individual modules on the network, and verifying power and ground connections.

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

Repair tips include repairing or replacing damaged wiring, ensuring proper connections, reprogramming modules if necessary, and replacing faulty modules that are causing communication issues.

5. Can OBDII code U1305 in a Buick impacting the Class 2 serial data circuit be fixed by resetting the vehicle's computer?

While resetting the computer may temporarily clear the code, it is important to address the underlying issue causing the high or low voltage on the Class 2 serial data circuit to prevent the code from reoccurring.

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

While the code itself does not pose immediate safety risks, unresolved communication issues between vehicle modules could potentially affect the operation of critical systems, so it is important to address the problem promptly.

7. How long does it typically take to repair OBDII code U1305 in a Buick indicating high or low voltage on the Class 2 serial data circuit?

The repair time can vary depending on the specific cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and resolve the problem effectively.

8. Can I continue to drive my Buick with OBDII code U1305 related to high or low voltage on the Class 2 serial data circuit?

It is generally not recommended to continue driving the vehicle with unresolved communication issues, as it may lead to further problems with various systems and potentially impact the overall performance and safety of the vehicle.

9. Is OBDII code U1305 in a Buick related to the Class 2 serial data circuit a common issue?

While not as common as some other OBDII codes, issues with high or low voltage on the Class 2 serial data circuit can occur in Buick vehicles, especially in older models or those with wiring or module issues.

10. Can a DIY enthusiast with automotive repair experience fix OBDII code U1305 in a Buick themselves?

Depending on the root cause of the issue, a DIY enthusiast with the necessary tools and knowledge may be able to diagnose and repair OBDII code U1305 related to the Class 2 serial data circuit, but complex electrical issues may require professional assistance.