AutoCodes – GMC – U1793 GMC

U1793 GMC Code - 14V Power Module Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion Communication Bus

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 Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain Control 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: U1793 GMC indicates 14V Power Module Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion Communication Bus.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain Control 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 555

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 U1793 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 to the 14V Power Module from the Hybrid/EV Powertrain Control Module has not been received.

OBDII Code U1793 GMC - 14V Power Module Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion Communication Bus - AutoCodes.com — U1793 GMC Code - 14V Power Module Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion Communication Bus

What does this mean?

What are the Possible Causes of the DTC U1793 GMC?

Faulty Hybrid/EV Powertrain Control Module
Hybrid/EV Powertrain Control Module harness is open or shorted
Hybrid/EV Powertrain Control Module circuit poor electrical connection
Faulty 14V Power Module

How to Fix the DTC U1793 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 U1793 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 U1793 GMC Code

1. What are the common symptoms of OBDII code U1793 in a GMC vehicle?

- Common symptoms include loss of power, issues with starting the vehicle, poor fuel efficiency, and warning lights on the dashboard.

2. What does the OBDII code U1793 indicating "14V Power Module Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion Communication Bus" mean?

- This code indicates a communication problem between the 14V power module and the Hybrid/EV powertrain control module on the vehicle's communication bus.

3. What are some possible causes of OBDII code U1793 in a GMC vehicle?

- Possible causes include damaged wiring, loose connections, faulty power modules, issues with the control modules, or problems with the communication bus.

4. How can I diagnose the OBDII code U1793 in my GMC vehicle?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific trouble codes, checking the wiring and connections related to the power modules and control modules, and testing the communication bus for faults.

5. How serious is OBDII code U1793 in a GMC vehicle?

- This code should be addressed promptly as it can lead to performance issues and potential safety concerns if left unresolved.

6. Can I continue driving my GMC vehicle with OBDII code U1793 present?

- It is not recommended to drive the vehicle with this code active, as it may affect the vehicle's performance and safety systems.

7. How can I repair OBDII code U1793 in my GMC vehicle?

- Repairing this code may involve fixing any wiring or connection issues, replacing faulty power modules or control modules, and ensuring proper communication between the components.

8. Is it necessary to visit a mechanic for OBDII code U1793 repair?

- While some DIY enthusiasts may attempt to diagnose and repair this code themselves, consulting a qualified mechanic is recommended for a thorough and accurate repair.

9. Are there any specific models of GMC vehicles prone to experiencing OBDII code U1793?

- This code can potentially occur in various GMC models equipped with hybrid or electric powertrain components that communicate over the powertrain expansion communication bus.

10. How can I prevent OBDII code U1793 from occurring in my GMC vehicle?

- Regular maintenance, such as checking and maintaining wiring connections, monitoring the health of power modules and control modules, and addressing any warning signs promptly, can help prevent the occurrence of this code.