P0735 Hyundai Code - Fifth Gear 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 (5th) 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
- P0735 Hyundai indicates Fifth Gear 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 P0735 Hyundai 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 (5th) 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 P0735 Hyundai?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0735 Hyundai?
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 P0735 Hyundai 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 P0735 Hyundai Code
1. What does the OBD-II code P0735 mean on a Hyundai?
Code P0735 indicates "Fifth Gear Incorrect Ratio," meaning the transmission is having trouble maintaining the proper ratio in fifth gear.
2. What are the common symptoms of P0735 on a Hyundai?
Symptoms include transmission slipping in fifth gear, erratic shifting, reduced fuel efficiency, and sometimes the check engine light illuminating.
3. What causes the P0735 code on a Hyundai?
Common causes include low transmission fluid, a faulty transmission solenoid, worn clutch packs, internal transmission damage, or issues with the vehicle's speed sensors.
4. Can driving with the P0735 code damage my Hyundai?
Yes, driving with this code can lead to further transmission damage and reduced performance. It’s best to address the issue promptly.
5. How do I diagnose the P0735 code on my Hyundai?
Diagnosis involves checking the transmission fluid level, inspecting solenoids and wiring, testing the speed sensors, and possibly disassembling the transmission for internal damage.
6. How can I fix the P0735 code on a Hyundai?
Repairs may include refilling or replacing transmission fluid, replacing faulty solenoids or sensors, or rebuilding the transmission if internal damage is found.
7. Will a low transmission fluid level cause the P0735 code?
Yes, insufficient transmission fluid can prevent proper gear engagement and trigger the P0735 code.
8. How much does it cost to repair the P0735 code on a Hyundai?
Costs vary depending on the issue, ranging from $100 for fluid replacement to several thousand dollars for a full transmission rebuild.
9. Can a faulty speed sensor cause the P0735 code on a Hyundai?
Yes, a malfunctioning speed sensor can send incorrect data to the transmission control module, causing gear ratio errors.
10. Is a software update needed to fix the P0735 code on a Hyundai?
In some cases, a software update for the transmission control module may resolve the issue, but this depends on the specific model and situation.
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