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AutoCodes – Honda – P1731 Honda

P1731 Honda 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 Honda 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 17,302
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Oct 09, 2019
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Code P1731 Honda 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 Honda - Problem In Shift Control System - AutoCodes.com
P1731 Honda Code - Problem In Shift Control System
What does this mean?

What are the Possible Causes of the DTC P1731 Honda?

  • 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 Honda?

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 Honda 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 P1731 Honda code?

Need more information on how to fix the P1731 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1731 Honda 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 P1731 Honda Code

1. What does the OBDII code P1731 mean on a Honda?

P1731 indicates a problem in the shift control system, typically related to the transmission's ability to shift gears properly.

2. What are the common symptoms of the P1731 code in a Honda?

Symptoms can include erratic shifting, delayed gear engagement, transmission slippage, or the vehicle being stuck in one gear.

3. What causes the P1731 code to appear on a Honda?

Common causes include a faulty shift solenoid, low or dirty transmission fluid, wiring issues, or problems with the transmission control module (TCM).

4. Can driving with the P1731 code damage my Honda?

Yes, prolonged driving with this code can lead to further transmission damage, so it’s best to address the issue as soon as possible.

5. How can I fix the P1731 code on my Honda?

Repairs may include replacing a faulty shift solenoid, flushing and refilling transmission fluid, repairing damaged wiring, or reprogramming or replacing the transmission control module.

6. How do I diagnose the P1731 code on a Honda?

Diagnosis involves using an OBDII scanner to confirm the code, checking transmission fluid condition, inspecting wiring and connectors, and testing the shift solenoids.

7. Can low transmission fluid trigger the P1731 code on a Honda?

Yes, low or contaminated transmission fluid can cause shifting issues and trigger the P1731 code.

8. Is the P1731 code specific to certain Honda models?

While the P1731 code can appear on various Honda models, it is most commonly associated with vehicles equipped with automatic transmissions.

9. How much does it cost to repair the P1731 code on a Honda?

Repair costs can vary widely, ranging from $100 for a fluid change to $500 or more for solenoid replacement or wiring repairs.

10. Can I clear the P1731 code without fixing the issue?

Clearing the code without addressing the root cause may only temporarily reset the check engine light, and the code is likely to return.

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