AutoCodes – Chevrolet – P1793 Chevrolet

P1793 Chevrolet 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 Chevrolet 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.

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Code Popularity 4,523

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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
FAQs
Comments
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Code P1793 Chevrolet 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 Chevrolet - Transmission Control Module Stack Overrun - AutoCodes.com — P1793 Chevrolet Code - Transmission Control Module Stack Overrun

What does this mean?

What are the Possible Causes of the DTC P1793 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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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 P1793 Chevrolet Code

What does the OBDII code P1793 mean on a Chevrolet?

1. P1793 refers to a "Transmission Control Module Stack Overrun," indicating the TCM has encountered an error due to excessive data or a processing fault. 2.

What are the common symptoms of code P1793 in a Chevrolet?

Symptoms may include erratic shifting, transmission slipping, failure to shift gears, illuminated check engine light, or the vehicle entering limp mode. 3.

What causes code P1793 to appear in a Chevrolet?

Common causes include software glitches in the TCM, wiring or connection issues, a failing TCM, or an overloaded processor due to excessive inputs. 4.

Can I drive my Chevrolet with a P1793 code?

It is not recommended to drive the vehicle for extended periods, as transmission issues can worsen and lead to further damage or unsafe driving conditions. 5.

How do I fix the P1793 code on my Chevrolet?

Repairs may involve updating or reprogramming the TCM software, inspecting and repairing wiring or connections, or replacing the TCM if it's determined to be faulty. 6.

Is P1793 a serious issue for my Chevrolet?

Yes, P1793 is a serious issue as it can affect the transmission's performance, potentially leading to unsafe driving conditions or expensive repairs if left unaddressed. 7.

How can I diagnose the P1793 code on my Chevrolet?

Diagnosing this code typically involves using an OBDII scanner to read the code, inspecting the TCM and related wiring, and testing the TCM for proper functionality. 8.

Can a software update resolve the P1793 code on a Chevrolet?

In some cases, a software update or reprogramming the TCM can resolve the issue, especially if the cause is related to a glitch or outdated software. 9.

What tools are needed to troubleshoot the P1793 code in a Chevrolet?

You will need an OBDII scanner, a multimeter for electrical testing, and possibly access to Chevrolet's service manual or diagnostic tools for TCM inspection. 10.

What could happen if the P1793 code is ignored on my Chevrolet?

Ignoring this code can lead to worsening transmission issues, reduced vehicle performance, potential safety hazards, and higher repair costs in the long run.