AutoCodes – Buick – P1781 Buick

P1781 Buick Code - Engine Torque Signal Circuit

Quick Answer

With the key on or engine running, the Powertrain Control Module (PCM) detects that the engine torque signal was below the lower or over the upper limit, or that the torque signal was unreliable, conditions met tor one second. Common causes for P1781 Buick include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. 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: P1781 Buick indicates Engine Torque Signal Circuit.
Common causes: Common causes for P1781 Buick include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
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 1,630

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 18, 2019

Description
How To Fix
Cost to Diagnose
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Code P1781 Buick Description

OBDII Code P1781 Buick - Engine Torque Signal Circuit - AutoCodes.com — P1781 Buick Code - Engine Torque Signal Circuit

How to Fix the DTC P1781 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 P1781 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.