AutoCodes – GMC – P1793 GMC

P1793 GMC Code - Transmission Control Module Stack Overrun

Quick Answer

The Engine Control Module (ECM) sends wheel speed data to the Transmission Control Module (TCM). Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Faulty Transmission Control Module (TCM). 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: P1793 GMC indicates Transmission Control Module Stack Overrun.
Common causes: Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Faulty Transmission Control Module (TCM).
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,712

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 Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1793 GMC Description

The Engine Control Module (ECM) sends wheel speed data to the Transmission Control Module (TCM). The data is sent to the TCM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1793 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1793.

OBDII Code P1793 GMC - Transmission Control Module Stack Overrun - AutoCodes.com — P1793 GMC Code - Transmission Control Module Stack Overrun

What does this mean?

What are the Possible Causes of the DTC P1793 GMC?

Faulty Transmission Control Module
Transmission Control Module harness is open or shorted
Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P1793 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 P1793 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.

Need more information about the P1793 GMC code?

Need more information on how to fix the P1793 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1793 GMC 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.