P0731 Mitsubishi Code - Gear 1 Incorrect Ratio
Quick Answer
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows: Torque converter slip ratio = A x C/B A: Output shaft revolution signal from revolution sensor B: Engine speed signal from Engine Control Module (ECM) C: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids. 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
- P0731 Mitsubishi indicates Gear 1 Incorrect Ratio.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids.
- 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.
Code P0731 Mitsubishi Description
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
What are the Possible Causes of the DTC P0731 Mitsubishi?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0731 Mitsubishi?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0731 Mitsubishi 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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Frequently Asked Questions about P0731 Mitsubishi Code
1. What does the OBDII code P0731 mean on a Mitsubishi?
P0731 indicates that the transmission control module (TCM) has detected an incorrect gear ratio for first gear, meaning the actual RPMs of the transmission do not match the expected RPMs.
2. What are the common symptoms of the P0731 code on a Mitsubishi?
Common symptoms include difficulty shifting, slipping in first gear, poor acceleration, transmission overheating, or the activation of the Check Engine Light.
3. What causes the P0731 code on a Mitsubishi?
Causes can include low or dirty transmission fluid, a faulty transmission solenoid, a worn clutch pack, damaged gear components, or issues with the transmission control module.
4. Can low transmission fluid cause the P0731 code?
Yes, low or contaminated transmission fluid can lead to improper hydraulic pressure, resulting in an incorrect gear ratio and triggering the P0731 code.
5. How can I fix the P0731 code on my Mitsubishi?
Start by checking and replacing the transmission fluid if it's low or dirty. If the problem persists, inspect the solenoids, clutch packs, and other internal transmission components for damage.
6. Is it safe to drive with the P0731 code active?
Driving with the P0731 code can cause further damage to the transmission over time. It’s best to address the issue as soon as possible to prevent costly repairs.
7. How do I diagnose the P0731 code on a Mitsubishi?
Diagnosis involves scanning for additional codes, checking the condition and level of the transmission fluid, testing the transmission solenoids, and inspecting the internal mechanical components.
8. Can a faulty transmission solenoid cause the P0731 code?
Yes, a malfunctioning transmission solenoid can prevent proper gear engagement, leading to an incorrect gear ratio and triggering the P0731 code.
9. How much does it cost to repair the P0731 code on a Mitsubishi?
Repair costs can vary widely depending on the cause, ranging from $100 for a fluid change to over $2,000 if significant transmission repairs are needed.
10. Will resetting the Check Engine Light fix the P0731 code?
Resetting the light without addressing the underlying issue will not fix the problem. The code will likely reappear until the root cause is resolved.
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