AutoCodes – GMC – P1743 GMC

P1743 GMC Code - Throttle Position Invalid Signal

Quick Answer

With the key on or engine running, the Transmission Control Module (TCM) received a throttle position pulse width signal that was more than 96% Common causes for P1743 GMC 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: P1743 GMC indicates Throttle Position Invalid Signal.
Common causes: Common causes for P1743 GMC 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 1,534

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 13, 2019

Description
How To Fix
Cost to Diagnose
FAQs
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Code P1743 GMC Description

With the key on or engine running, the Transmission Control Module (TCM) received a throttle position pulse width signal that was more than 96%

OBDII Code P1743 GMC - Throttle Position Invalid Signal - AutoCodes.com — P1743 GMC Code - Throttle Position Invalid Signal

How to Fix the DTC P1743 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 P1743 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.

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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 P1743 GMC Code

1. What does the OBDII code P1743 mean for a GMC vehicle?

P1743 indicates an "Invalid Throttle Position Signal," meaning the transmission control module is receiving an unexpected or incorrect signal from the throttle position sensor (TPS).

2. What are the common symptoms of a P1743 code in GMC vehicles?

Symptoms may include poor acceleration, erratic shifting, transmission slipping, reduced fuel efficiency, or the Check Engine Light being illuminated.

3. What causes the P1743 code to appear on GMC vehicles?

Common causes include a faulty throttle position sensor (TPS), damaged wiring or connectors, issues with the transmission control module, or incorrect calibration of the TPS.

4. Can a faulty throttle position sensor cause transmission problems?

Yes, a faulty TPS can send incorrect signals to the transmission control module, leading to shifting issues and triggering the P1743 code.

5. How do I diagnose a P1743 code on my GMC vehicle?

Start by scanning for additional codes, inspecting the throttle position sensor and its wiring, checking for loose connections, and testing the TPS voltage with a multimeter.

6. Is it safe to drive a GMC vehicle with a P1743 code?

Driving with this code is not recommended, as it can cause transmission issues, poor performance, and potential damage if left unresolved.

7. Can a software issue cause the P1743 code in a GMC vehicle?

Yes, a software glitch in the transmission control module may occasionally cause this code. Updating or reprogramming the module may resolve the issue.

8. How can I fix a P1743 code on my GMC vehicle?

Repairs may include replacing the throttle position sensor, repairing damaged wiring, cleaning corroded connectors, or recalibrating the TPS.

9. How much does it cost to repair a P1743 code on a GMC vehicle?

The cost depends on the specific repair, but replacing a TPS typically costs $100â€“$300, while wiring repairs or module programming may vary.

10. Can a dirty throttle body trigger the P1743 code?

Yes, a dirty or obstructed throttle body can cause erratic TPS signals, potentially leading to a P1743 code. Cleaning the throttle body may help resolve the issue.