AutoCodes – Cadillac – U1305 Cadillac

U1305 Cadillac 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 Cadillac 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 3,731

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 Cadillac 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 Cadillac - High Or Low Voltage On Class 2 Serial Data Circuit - AutoCodes.com — U1305 Cadillac Code - High Or Low Voltage On Class 2 Serial Data Circuit

What does this mean?

What are the Possible Causes of the DTC U1305 Cadillac?

Repair other code first

How to Fix the DTC U1305 Cadillac?

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 Cadillac 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.

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

Need Help with the Code?

Get the U1305 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U1305 in a Cadillac?

- Common symptoms include intermittent or complete loss of communication between modules, warning lights on the dashboard, and issues with various vehicle systems.

2. What can cause the U1305 code to appear in a Cadillac?

- The U1305 code is typically triggered by high or low voltage levels on the Class 2 serial data circuit, which may be caused by a short circuit, damaged wiring, faulty modules, or a weak battery.

3. How can I diagnose the U1305 code in my Cadillac?

- Diagnosing the U1305 code involves using a professional OBDII scanner to retrieve the code, checking for other related codes, inspecting the wiring and connectors for damage, and testing the various modules on the Class 2 serial data circuit.

4. What are some repair tips for fixing the U1305 code in a Cadillac?

- Repair tips may include repairing or replacing damaged wiring, addressing any issues with the modules on the data circuit, ensuring proper battery voltage, and clearing the code after repairs are completed.

5. Can I drive my Cadillac with the U1305 code present?

- It is not recommended to drive your Cadillac with the U1305 code present, as it may lead to communication issues between critical vehicle systems and potentially affect the overall performance and safety of the vehicle.

6. How much does it typically cost to fix the U1305 code in a Cadillac?

- The cost of fixing the U1305 code can vary depending on the underlying cause, the extent of damage, and the labor rates at the repair shop. It is recommended to get a diagnostic assessment to determine the exact cost.

7. Are there any preventive measures to avoid the U1305 code in a Cadillac?

- Regular maintenance, checking the battery health, inspecting wiring for wear and tear, and addressing any electrical issues promptly can help prevent the occurrence of the U1305 code in a Cadillac.

8. Can I reset the U1305 code in my Cadillac on my own?

- You can attempt to clear the U1305 code using an OBDII scanner, but it is important to diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

9. Will the U1305 code cause my Cadillac to fail an emissions test?

- The U1305 code itself may not cause your Cadillac to fail an emissions test, but it indicates a problem with the vehicle's communication system that should be addressed to ensure proper functioning and compliance with emissions standards.

10. How long does it take to repair the U1305 code in a Cadillac?

- The repair time for the U1305 code can vary depending on the complexity of the issue, availability of parts, and the expertise of the mechanic. It is advisable to consult with a professional for an accurate estimate of the repair time.