AutoCodes – Acura – P1731 Acura

P1731 Acura Code - Problem In Shift Control System

Quick Answer

Hydraulic pressure to each clutch is controlled by the shift valve. Common causes include Faulty Shift Solenoid Valves, Shift Solenoid Valves harness is open or shorted, Shift Solenoid Valves 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: P1731 Acura indicates Problem In Shift Control System.
Common causes: Common causes include Faulty Shift Solenoid Valves, Shift Solenoid Valves harness is open or shorted, Shift Solenoid Valves 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 2,973

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 Oct 09, 2019

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

Hydraulic pressure to each clutch is controlled by the shift valve. The shift valve activates according to the ON/OFF status of shift solenoid valves A, B, C, D, and E. Hydraulic pressure supply in D position is shown above. The line pressure or the clutch pressure control pressure (CPC A, CPC B, or CPC C) is supplied to each clutch by the shift valve activated. The Powertrain Control Module (PCM) computes the actual ratio of mainshaft to countershaft revolutions. If a difference between the actual ratio and the commanded gear occurs when shifting to each gear position, a malfunction in the shift solenoid valve or the hydraulic system is detected and a Diagnostic Trouble Code (DTC) is stored.

OBDII Code P1731 Acura - Problem In Shift Control System - AutoCodes.com — P1731 Acura Code - Problem In Shift Control System

What does this mean?

What are the Possible Causes of the DTC P1731 Acura?

Faulty Shift Solenoid Valves
Shift Solenoid Valves harness is open or shorted
Shift Solenoid Valves circuit poor electrical connection

How to Fix the DTC P1731 Acura?

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 Acura 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 P1731 Acura Code

1. What does the OBDII code P1731 mean for an Acura?

P1731 indicates a problem in the shift control system, suggesting an issue with how the transmission shifts gears.

2. What are common symptoms of code P1731 on an Acura?

Symptoms may include erratic or delayed shifting, slipping gears, harsh gear engagement, or the Check Engine Light being illuminated.

3. What causes the Acura P1731 code to appear?

Common causes include a faulty transmission control module (TCM), damaged shift solenoids, low or contaminated transmission fluid, or wiring issues in the shift control system.

4. Can driving with code P1731 damage my Acura's transmission?

Yes, driving with this code can worsen transmission issues and potentially lead to severe damage if the underlying problem isnâ€™t fixed promptly.

5. How can I diagnose the P1731 code on an Acura?

Diagnosis typically involves checking the transmission fluid level and condition, inspecting wiring and connectors, testing shift solenoids, and scanning the TCM for additional codes.

6. Is low transmission fluid a possible cause of code P1731?

Yes, low or contaminated transmission fluid can disrupt the shift control system and trigger the P1731 code.

7. How do I fix the P1731 code on my Acura?

Repairs may include replacing faulty shift solenoids, cleaning or refilling the transmission fluid, repairing wiring issues, or reprogramming or replacing the TCM.

8. Do I need a mechanic to fix code P1731 on an Acura?

While some fixes like checking fluid levels can be done at home, diagnosing and repairing components like solenoids or the TCM may require professional expertise.

9. How much does it cost to repair the P1731 code on an Acura?

Repair costs vary widely depending on the cause, ranging from $150 for simple fixes like fluid replacement to over $1,000 for TCM replacement or transmission repairs.

10. Can a faulty shift solenoid cause the P1731 code on an Acura?

Yes, a malfunctioning shift solenoid can prevent proper gear shifting and trigger the P1731 code.