AutoCodes – Cadillac – U025B Cadillac

U025B Cadillac Code - Lost Communication With Special Purpose Vehicle Control Module 'C'

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Special Purpose Vehicle Control Module 'C', Special Purpose Vehicle Control Module 'C' harness is open or shorted, Special Purpose Vehicle Control Module 'C' circuit poor electrical 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: U025B Cadillac indicates Lost Communication With Special Purpose Vehicle Control Module 'C'.
Common causes: Common causes include Faulty Special Purpose Vehicle Control Module 'C', Special Purpose Vehicle Control Module 'C' harness is open or shorted, Special Purpose Vehicle Control Module 'C' circuit poor electrical 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.

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Code Popularity 481

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 Apr 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U025B Cadillac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Special Purpose Vehicle Control Module 'C' has not been received.

OBDII Code U025B Cadillac - Lost Communication With Special Purpose Vehicle Control Module 'C' - AutoCodes.com — U025B Cadillac Code - Lost Communication With Special Purpose Vehicle Control Module 'C'

What does this mean?

What are the Possible Causes of the DTC U025B Cadillac?

Faulty Special Purpose Vehicle Control Module 'C'
Special Purpose Vehicle Control Module 'C' harness is open or shorted
Special Purpose Vehicle Control Module 'C' circuit poor electrical connection

How to Fix the DTC U025B 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U025B 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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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 U025B Cadillac Code

1. What are the common symptoms of OBDII code U025B in a Cadillac related to "Lost Communication With Special Purpose Vehicle Control Module 'C'"?

- Common symptoms include dashboard warning lights illuminating, loss of functionality in certain vehicle systems, and potential drivability issues.

2. What could cause the OBDII code U025B to appear in a Cadillac?

- The code may be triggered by a faulty Special Purpose Vehicle Control Module 'C', damaged wiring or connectors, software issues, or electrical malfunctions.

3. How can I diagnose the source of the communication loss with the Special Purpose Vehicle Control Module 'C' in my Cadillac?

- Diagnose the issue by checking the wiring and connectors for damage, ensuring proper power and ground connections, and using a diagnostic scanner to communicate with the affected module.

4. Can a DIY enthusiast repair the communication issue causing OBDII code U025B in a Cadillac?

- While basic checks like inspecting wiring and connectors can be performed by a DIY enthusiast, advanced diagnostics and repairs may require professional equipment and expertise.

5. Is it safe to continue driving a Cadillac with the U025B code indicating a communication problem?

- It is not recommended to drive the vehicle with unresolved communication issues, as it can lead to further system malfunctions or safety concerns.

6. How much does it typically cost to repair the U025B code related to "Lost Communication With Special Purpose Vehicle Control Module 'C'" in a Cadillac?

- Repair costs can vary widely depending on the root cause of the issue, but expect expenses for diagnosis, parts replacement, and labor to address the communication problem.

7. Can resetting the OBDII code U025B in a Cadillac temporarily fix the communication problem?

- Resetting the code may temporarily clear the warning light, but it will not resolve the underlying communication issue with the Special Purpose Vehicle Control Module 'C'.

8. Are there any recalls or technical service bulletins related to the U025B code in Cadillac vehicles?

- Check with your local Cadillac dealership or online resources for any recalls or technical service bulletins addressing the communication problem associated with code U025B.

9. What steps can I take to prevent the recurrence of the U025B code in my Cadillac after repair?

- Regular maintenance, proper care of electrical components, and addressing any related issues promptly can help prevent the U025B code from reappearing in your Cadillac.

10. Do other vehicle systems need to be checked when troubleshooting the U025B code in a Cadillac?

- Yes, it is advisable to check other related systems, such as communication networks, power and ground connections, and neighboring control modules when diagnosing the U025B code in a Cadillac.