AutoCodes – Generic – U1795

U1795 Code - 14V Power Module Powertrain Expansion Communication Bus Off

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty 14V Power Module, 14V Power Module harness is open or shorted, 14V Power Module 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: U1795 indicates 14V Power Module Powertrain Expansion Communication Bus Off.
Common causes: Common causes include Faulty 14V Power Module, 14V Power Module harness is open or shorted, 14V Power Module 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 699

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 Jun 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1795 Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message from the 14V Power Module has not been received.

OBDII Code U1795 - 14V Power Module Powertrain Expansion Communication Bus Off - AutoCodes.com — U1795 Code - 14V Power Module Powertrain Expansion Communication Bus Off

What does this mean?

What are the Possible Causes of the DTC U1795?

Faulty 14V Power Module
14V Power Module harness is open or shorted
14V Power Module circuit poor electrical connection

How to Fix the DTC U1795?

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 U1795 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 U1795 code?

Need more information on how to fix the U1795 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1795 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1795 Buick — 14V Power Module Powertrain Expansion Communication Bus Off
U1795 Cadillac — 14V Power Module Powertrain Expansion Communication Bus Off
U1795 Chevrolet — 14V Power Module Powertrain Expansion Communication Bus Off
U1795 GMC — 14V Power Module Powertrain Expansion Communication Bus Off

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 U1795 Code

1. What are common symptoms of OBDII code U1795?

The common symptoms of OBDII code U1795 include issues with powertrain expansion communication, such as loss of communication with the 14V power module or other related modules.

2. What are possible causes of OBDII code U1795?

Possible causes of OBDII code U1795 include faulty wiring or connections, a malfunctioning 14V power module, issues with the powertrain expansion communication bus, or a software glitch in the vehicle's system.

3. How can I diagnose OBDII code U1795?

Diagnosing OBDII code U1795 typically involves using a diagnostic scanner to retrieve the code, checking the communication bus for any faults, inspecting wiring and connections for damage, and testing the 14V power module for proper functioning.

4. Can OBDII code U1795 be repaired at home?

Repairing OBDII code U1795 may require advanced diagnostic tools and knowledge, making it challenging to fix at home. It is recommended to seek assistance from a professional mechanic or dealership for accurate diagnosis and repair.

5. Is it safe to continue driving with OBDII code U1795 present?

Continuing to drive with OBDII code U1795 present is not recommended, as it may lead to further communication issues within the powertrain system, potentially affecting the vehicle's performance and safety.

6. How much does it typically cost to repair OBDII code U1795?

The cost of repairing OBDII code U1795 can vary depending on the underlying cause of the issue. It is advisable to obtain quotes from different repair shops or dealerships to determine the most cost-effective solution.

7. Can resetting the OBDII system clear code U1795?

Resetting the OBDII system may temporarily clear the code U1795, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause of the problem to prevent further issues.

8. Are there any known recalls related to OBDII code U1795?

There are no known recalls specifically related to OBDII code U1795. However, it is always advisable to check with the vehicle manufacturer or authorized dealerships for any relevant recalls or service bulletins.

9. How long does it take to repair OBDII code U1795?

The repair time for OBDII code U1795 can vary depending on the complexity of the issue and the availability of parts. It is best to consult with a professional technician for a more accurate estimate of the repair duration.

10. Can a DIY enthusiast fix OBDII code U1795 without specialized tools?

Repairing OBDII code U1795 without specialized tools can be challenging due to the need for diagnostics and programming capabilities. It is recommended to consult with a professional mechanic or dealership for proper diagnosis and repair.