AutoCodes – GMC – U1795 GMC

U1795 GMC 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 GMC 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 523

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC U1795 GMC?

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 GMC?

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 GMC 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 U1795 GMC Code

1. What are common symptoms of OBDII code U1795 GMC?

- Common symptoms include the check engine light turning on, limited powertrain functionality, and potential issues with power distribution in the vehicle.

2. What does the OBDII code U1795 GMC "14V Power Module Powertrain Expansion Communication Bus Off" mean?

- This code indicates a communication bus issue related to the 14V power module in the powertrain expansion system of the vehicle.

3. What are possible causes of OBDII code U1795 GMC?

- Possible causes may include faulty wiring or connections in the powertrain expansion communication system, a malfunctioning 14V power module, or a communication bus error within the system.

4. How can I diagnose the OBDII code U1795 GMC?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific error code and examining the powertrain expansion communication system for any visible issues.

5. Is it safe to drive with OBDII code U1795 GMC active?

- It is not recommended to drive the vehicle with this code active, as it may lead to powertrain issues and potential safety hazards due to communication bus errors.

6. Can I repair OBDII code U1795 GMC myself?

- Repairing this code may require advanced automotive knowledge and specialized tools, so it is advisable to consult a professional mechanic for proper diagnosis and repair.

7. What are some repair tips for addressing OBDII code U1795 GMC?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections in the powertrain expansion communication system, and potentially replacing the 14V power module if necessary.

8. How much does it cost to fix OBDII code U1795 GMC?

- The cost of fixing this code can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the mechanic or repair shop.

9. Can resetting the OBDII code U1795 GMC turn off the check engine light?

- Resetting the code may temporarily turn off the check engine light, but it is important to diagnose and address the underlying issue to prevent the code from reoccurring.

10. How can I prevent OBDII code U1795 GMC from happening again?

- To prevent this code from happening again, regular maintenance checks, ensuring proper electrical connections, and addressing any powertrain system issues promptly can help maintain the vehicle's health.