P0734 Ford Code - Incorrect Fourth 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 (4th) 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
- P0734 Ford indicates Incorrect Fourth 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 P0734 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 (4th) 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 P0734 Ford?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0734 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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0734 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 P0734 Ford Code
1. What are the common symptoms of OBDII code P0734 on a Ford vehicle?
- Common symptoms may include harsh shifting, slippage in fourth gear, decreased fuel efficiency, and the transmission staying in third gear.
2. What are some possible causes of the P0734 code in a Ford, indicating an Incorrect Fourth Gear Ratio?
- Potential causes may include low transmission fluid levels, a faulty torque converter, worn clutch components, or issues with the transmission control module.
3. How can I diagnose the P0734 code on my Ford vehicle?
- Diagnosis typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting for any leaks, and performing a road test to observe the shifting behavior.
4. Can driving with the P0734 code present cause further damage to my Ford's transmission?
- Continuing to drive with the P0734 code may lead to increased wear on transmission components and potentially result in more severe transmission issues over time.
5. Is it safe to continue driving my Ford with the P0734 code if the transmission seems to be functioning normally?
- It is recommended to address the underlying cause of the P0734 code promptly to prevent any potential long-term damage to the transmission.
6. What are some repair tips for fixing the P0734 code on a Ford vehicle?
- Repair tips may include checking and topping up transmission fluid levels, inspecting and replacing worn clutch components, addressing any leaks, and ensuring proper operation of the torque converter.
7. How much does it typically cost to repair the P0734 code on a Ford vehicle?
- The cost of repairs for the P0734 code can vary depending on the specific cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Can I reset the OBDII code P0734 on my Ford without fixing the underlying issue?
- While you can clear the code temporarily, it is not recommended to do so without addressing the root cause, as the issue will likely return and potentially worsen over time.
9. Will disconnecting the battery reset the P0734 code on my Ford?
- Disconnecting the battery may clear the code temporarily, but it is not a permanent solution and will not fix the underlying problem causing the Incorrect Fourth Gear Ratio.
10. How long does it typically take to repair the P0734 code on a Ford vehicle?
- The repair time for the P0734 code can vary depending on the specific cause and complexity of the issue, but it may take a few hours to a full day for diagnosis and repairs to be completed.
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