AutoCodes – Generic – P1731

P1731 Code - A/T 1st Engine Braking

Quick Answer

The engine braking is controlled by the Low Coast Brake Solenoid Valve. Common causes include Low transmission fluid, Faulty Low Coast Brake Solenoid Valve, Low Coast Brake Solenoid Valve harness is open or shorted. 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 indicates A/T 1st Engine Braking.
Common causes: Common causes include Low transmission fluid, Faulty Low Coast Brake Solenoid Valve, Low Coast Brake Solenoid Valve harness is open or shorted.
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 43,498

How popular is this code, among other codes? Medium

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 Aug 03, 2020

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

The engine braking is controlled by the Low Coast Brake Solenoid Valve. The Transmission Control Module (TCM) uses the Automatic Transmission Fluid (ATF) Pressure Switch to monitor the Low Coast Brake apply pressure. The Diagnostic Trouble Code (DTC) will set when the TCM monitors each ATF Pressure Switch and Low Coast Brake Solenoid monitor value and detects as irregular when engine brake of 1st gear acts other than at M1 position.

OBDII Code P1731 - A/T 1st Engine Braking - AutoCodes.com — P1731 Code - A/T 1st Engine Braking

What does this mean?

What are the Possible Causes of the DTC P1731?

Low transmission fluid
Faulty Low Coast Brake Solenoid Valve
Low Coast Brake Solenoid Valve harness is open or shorted
Low Coast Brake Solenoid Valve circuit poor electrical connection
Faulty Automatic Transmission Fluid (ATF) Pressure Switch

How to Fix the DTC P1731?

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 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 code?

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

Need Help with the Code?

Get the P1731 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1731 Acura — Problem In Shift Control System
P1731 Chrysler — Incorrect Gear Engaged
P1731 Ford — 1-2 Shift Malfunction
P1731 Honda — Problem In Shift Control System
P1731 Hyundai — Front Speed Sensor High
P1731 Infiniti — A/T 1st Engine Braking
P1731 Jeep — Incorrect Gear Engaged
P1731 Nissan — A/T 1st Engine Braking
P1731 RAM — Incorrect Gear Engaged

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 Code

1. What are common symptoms of OBDII code P1731 (A/T 1st Engine Braking)?

- Common symptoms include rough shifting, engine braking feeling stronger than usual, and a decrease in fuel efficiency.

2. What are possible causes of OBDII code P1731?

- Possible causes include a malfunctioning transmission control module (TCM), issues with the torque converter, or a faulty shift solenoid.

3. How can I diagnose the cause of OBDII code P1731?

- Diagnosing the code may involve performing a thorough inspection of the transmission system, checking for any loose or damaged wiring, and using a scan tool to gather data from the TCM.

4. Is it safe to continue driving with OBDII code P1731 present?

- It is not recommended to drive with the code present, as it can lead to further damage to the transmission system and potentially unsafe driving conditions.

5. What are some potential repair tips for addressing OBDII code P1731?

- Repair tips may include checking and replacing damaged wiring, repairing or replacing the TCM if necessary, inspecting the torque converter for issues, and ensuring proper transmission fluid levels.

6. Can OBDII code P1731 be fixed without professional help?

- While some DIY enthusiasts may attempt to address the code themselves, it is often recommended to seek professional help due to the complexity of transmission system repairs.

7. Are there any preventive maintenance measures to avoid OBDII code P1731?

- Regularly servicing the transmission system, ensuring proper fluid levels, and addressing any unusual symptoms promptly can help prevent OBDII code P1731 from occurring.

8. How much does it typically cost to repair OBDII code P1731?

- The cost of repairing OBDII code P1731 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can resetting the OBDII code P1731 clear the issue permanently?

- Resetting the code may temporarily clear the issue, but if the underlying problem is not addressed, the code is likely to reappear once the vehicle is driven again.

10. Is it necessary to visit a dealership for repairs related to OBDII code P1731?

- While dealerships may have specialized knowledge and tools for addressing transmission issues, independent auto repair shops with experience in diagnosing and repairing transmission problems can also effectively address OBDII code P1731.

1. What are the common symptoms of OBDII code P1731 (A/T 1st Engine Braking)?

- Common symptoms include harsh shifting, delayed shifting, and the transmission staying in a higher gear for longer than necessary.

2. What are the possible causes of OBDII code P1731?

- Possible causes of this code include a malfunctioning transmission control module (TCM), a faulty shift solenoid, low transmission fluid levels, or internal transmission issues.

3. How can I diagnose OBDII code P1731?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the code and checking the transmission fluid level and condition. A professional technician may also perform further tests on the TCM and shift solenoids.

4. Can I continue driving with OBDII code P1731 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially dangerous driving conditions.

5. How can I repair OBDII code P1731?

- Repairing this code may involve replacing the faulty shift solenoid, addressing any transmission fluid issues, or repairing the TCM. It is best to consult a qualified mechanic for an accurate diagnosis and repair.

6. Is it safe to ignore OBDII code P1731?

- Ignoring this code can lead to more severe transmission problems over time. It is advised to address the underlying issue promptly to prevent further damage.

7. Can low transmission fluid cause OBDII code P1731?

- Yes, low transmission fluid levels can cause this code to appear as it can affect the proper operation of the transmission components.