AutoCodes – Chevrolet – P1781 Chevrolet

P1781 Chevrolet 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 Chevrolet 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 Chevrolet indicates Engine Torque Signal Circuit.
Common causes: Common causes for P1781 Chevrolet 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.

Save to My Repairs My Repairs

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

Code Popularity 23,853

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
FAQs
Comments
Add Comment

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

Code P1781 Chevrolet Description

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

How to Fix the DTC P1781 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 P1781 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 P1781 Chevrolet code?

Need more information on how to fix the P1781 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1781 Chevrolet 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.

Frequently Asked Questions about P1781 Chevrolet Code

1. What are the common symptoms of OBDII code P1781 in a Chevrolet related to the Engine Torque Signal Circuit?

The common symptoms include rough shifting, transmission slipping, decreased fuel efficiency, and the Check Engine light illuminating.

2. What usually causes the OBDII code P1781 in a Chevrolet?

The most typical causes of P1781 are issues with the engine torque signal circuit, such as damaged wiring, loose connections, or a faulty torque sensor.

3. How can I diagnose the OBDII code P1781 in my Chevrolet?

Diagnosing P1781 involves using an OBDII scanner to retrieve the code, inspecting the engine torque sensor and its wiring, checking for loose connections, and testing the sensor's functionality.

4. Is it safe to continue driving my Chevrolet with OBDII code P1781 present?

It is not recommended to drive the vehicle with P1781 as it can lead to further damage to the transmission and other drivetrain components. Immediate attention and repair are advised.

5. Can I repair OBDII code P1781 in my Chevrolet myself?

While some DIY enthusiasts may attempt to repair P1781, it is recommended to consult a professional mechanic or dealership due to the complexity of diagnosing and fixing issues related to the engine torque signal circuit.

6. How much does it cost to repair OBDII code P1781 in a Chevrolet?

The cost of repairing P1781 can vary depending on the exact cause of the issue, labor rates, and parts needed. It is advisable to get multiple quotes from different repair shops to compare prices.

7. Will resetting the Check Engine light resolve OBDII code P1781 in my Chevrolet?

Simply resetting the Check Engine light will not fix the underlying issue causing P1781. It is crucial to diagnose the problem, address the root cause, and clear the code properly.

8. Can a bad torque sensor be the sole reason for OBDII code P1781 in a Chevrolet?

While a faulty torque sensor is a common culprit for P1781, other factors like damaged wiring, loose connections, or issues with the engine control module can also trigger the code.

9. How long does it typically take to repair OBDII code P1781 in a Chevrolet?

The repair time for P1781 can vary depending on the exact cause and the availability of parts. In some cases, it can be resolved within a few hours, while more complex issues may take longer.

10. Are there any preventive maintenance tips to avoid OBDII code P1781 in a Chevrolet?

Regularly inspecting the transmission system, addressing any warning signs promptly, and following the manufacturer's recommended maintenance schedule can help prevent issues leading to P1781.