AutoCodes – KIA – P1773 KIA

P1773 KIA Code - Gearbox Input Speed Sensor

Quick Answer

The P1773 diagnostic trouble code (DTC) for Hyundai vehicles specifically points to an issue with the gearbox input speed sensor. Common causes include Faulty Gearbox Input Speed Sensor, Gearbox Input Speed Sensor harness is open or shorted, Gearbox Input Speed Sensor circuit poor electrical connection. 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: P1773 KIA indicates Gearbox Input Speed Sensor.
Common causes: Common causes include Faulty Gearbox Input Speed Sensor, Gearbox Input Speed Sensor harness is open or shorted, Gearbox Input Speed Sensor circuit poor electrical connection.
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 50

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 Oct 02, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1773 KIA Description

The P1773 diagnostic trouble code (DTC) for Hyundai vehicles specifically points to an issue with the gearbox input speed sensor. This sensor is a crucial component of the vehicle's transmission system, as it is responsible for monitoring the speed of the input shaft in the gearbox. By constantly measuring the speed at which the input shaft rotates, the sensor helps the transmission control module (TCM) to determine the optimal gear ratio for smooth shifting and overall performance.

OBDII Code P1773 KIA - Gearbox Input Speed Sensor - AutoCodes.com — P1773 KIA Code - Gearbox Input Speed Sensor

What does this mean?

What are the Possible Causes of the DTC P1773 KIA?

Faulty Gearbox Input Speed Sensor
Gearbox Input Speed Sensor harness is open or shorted
Gearbox Input Speed Sensor circuit poor electrical connection

How to Fix the DTC P1773 KIA?

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 P1773 KIA 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.