P0731 Ford Code - Incorrect First Gear 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 Ford indicates Incorrect First Gear 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 Ford 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 Ford?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0731 Ford?
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
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0731 Ford 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 Ford Code
1. What are the common symptoms of OBDII code P0731 in a Ford vehicle?
- Common symptoms include harsh or delayed shifting, slippage in the transmission, poor acceleration, and the Check Engine Light coming on.
2. What does the OBDII code P0731 in a Ford indicate?
- The code P0731 indicates that the powertrain control module (PCM) has detected an incorrect gear ratio in the first gear of the transmission.
3. What are some possible causes of the P0731 code in a Ford?
- Possible causes include low transmission fluid, a faulty transmission solenoid, a worn clutch or bands, a malfunctioning valve body, or internal transmission damage.
4. How do you diagnose the OBDII code P0731 in a Ford?
- Diagnosing the code typically involves checking the transmission fluid level and condition, inspecting for any leaks, performing a transmission pressure test, and scanning the vehicle for other related trouble codes.
5. Can driving with the P0731 code present cause further damage to the transmission?
- Yes, driving with the P0731 code present can potentially cause further damage to the transmission if left unrepaired, as it can lead to increased wear and potential failure of transmission components.
6. How can the OBDII code P0731 in a Ford be repaired?
- Repair options may include topping up or replacing the transmission fluid, repairing or replacing faulty components such as solenoids or the valve body, or rebuilding the transmission if necessary.
7. Is it safe to continue driving the vehicle with the P0731 code before getting it repaired?
- It is not recommended to continue driving the vehicle with the P0731 code present, as it can lead to further damage to the transmission and potentially result in a costly repair.
8. Can a DIY enthusiast fix the OBDII code P0731 issue in a Ford?
- While some minor maintenance tasks like checking the transmission fluid can be done by a DIY enthusiast, diagnosing and repairing the underlying causes of the P0731 code often require specialized tools and expertise best handled by a professional mechanic.
9. How much does it typically cost to repair the OBDII code P0731 in a Ford?
- The cost of repairing the P0731 code can vary depending on the specific cause and extent of the issue, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for more extensive transmission work.
10. Can regular transmission maintenance help prevent the occurrence of the P0731 code in a Ford?
- Yes, regular transmission maintenance such as fluid changes, filter replacements, and timely repairs of any minor issues can help prevent the occurrence of the P0731 code by keeping the transmission in good working condition.
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