AutoCodes – Chrysler – P1731 Chrysler

P1731 Chrysler Code - Incorrect Gear Engaged

Quick Answer

The Transmission Control Module (TCM) constantly calculates the transmission ratio based on the Input Speed Sensor signal and Output Shaft Speed signal. Common causes include Low transmission fluid, Internal transmission problem, Intermittent sticking valve in the valve body. 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: P1731 Chrysler indicates Incorrect Gear Engaged.
Common causes: Common causes include Low transmission fluid, Internal transmission problem, Intermittent sticking valve in the valve body.
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 1,954

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 Mar 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1731 Chrysler Description

The Transmission Control Module (TCM) constantly calculates the transmission ratio based on the Input Speed Sensor signal and Output Shaft Speed signal. This diagnostic will detect if the transmission is trying to mechanically shift into a different gear than what the TCM commanded. The Diagnostic Trouble Code (DTC) will be set when the actual (calculated) gear differs from target (expected) gear, the turbine slip (difference between actual and calculated turbine speeds) is greater than 300 rpm, or the calculated Transmission ratio is above calibrated value. Also, the DTC could be set during a downshift and the actual (calculated) gear is greater than target (expected) gear or an actual (calculated) gear is 1st and target (desired) gear is 2nd.

OBDII Code P1731 Chrysler - Incorrect Gear Engaged - AutoCodes.com — P1731 Chrysler Code - Incorrect Gear Engaged

What does this mean?

What are the Possible Causes of the DTC P1731 Chrysler?

Low transmission fluid
Internal transmission problem
Intermittent sticking valve in the valve body
Faulty Transmission Control Module (TCM)

How to Fix the DTC P1731 Chrysler?

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 P1731 Chrysler 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.