AutoCodes – Buick – P1779 Buick

P1779 Buick Code - Engine Torque Delivered To TCM Signal

Quick Answer

The Automatic Transmission Control Module (TCM) receives transmission-related information from the Engine Control Module (ECM) via serial data. Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted. 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: P1779 Buick indicates Engine Torque Delivered To TCM Signal.
Common causes: Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted.
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 6,784

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 Jul 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1779 Buick Description

The Automatic Transmission Control Module (TCM) receives transmission-related information from the Engine Control Module (ECM) via serial data. When the ECM receives invalid transmission-related information, it notifies the TCM. The TCM then sets the appropriate Diagnostic Trouble Code (DTC).

OBDII Code P1779 Buick - Engine Torque Delivered To TCM Signal - AutoCodes.com — P1779 Buick Code - Engine Torque Delivered To TCM Signal

What does this mean?

What are the Possible Causes of the DTC P1779 Buick?

Check other engine related codes first
Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P1779 Buick?

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 P1779 Buick 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.