P0730 Code - Incorrect 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 speed sensor (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 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
- P0730 indicates Incorrect 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 P0730 Description
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from speed sensor (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 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 P0730?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0730?
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 P0730 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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Information for Specific Makes
- P0730 Acura — Faulty Shift Control System
- P0730 Audi — Incorrect Gear Ratio
- P0730 Buick — Incorrect Gear Ratio
- P0730 Cadillac — Incorrect Gear Ratio
- P0730 Chevrolet — Incorrect Gear Ratio
- P0730 Chrysler — Incorrect Gear Ratio
- P0730 Dodge — Incorrect Gear Ratio
- P0730 Ford — Incorrect Gear Ratio
- P0730 GMC — Incorrect Gear Ratio
- P0730 Honda — Faulty Shift Control System
- P0730 Hyundai — Incorrect Gear Ratio
- P0730 Infiniti — Incorrect Gear Ratio
- P0730 Jeep — Incorrect Gear Ratio
- P0730 Mazda — Incorrect Gear Ratio
- P0730 Mercedes-Benz — Incorrect Gear Ratio
- P0730 Nissan — Belt Damage
- P0730 Oldsmobile — Incorrect Gear Ratio
- P0730 Pontiac — Incorrect Gear Ratio
- P0730 Suzuki — Incorrect Gear Ratio
- P0730 Toyota — Incorrect Gear Ratio
- P0730 Volkswagen — Incorrect Gear Ratio
Frequently Asked Questions about P0730 Code
1. What are the common symptoms of OBDII code P0730 Incorrect Gear Ratio?
- Common symptoms include difficulty shifting gears, delayed or harsh shifting, slipping gears, and illuminated Check Engine Light.
2. What are the possible causes of OBDII code P0730 Incorrect Gear Ratio?
- Causes can include low transmission fluid, a faulty transmission shift solenoid, damaged clutch components, worn gears, or a malfunctioning transmission control module.
3. How can I diagnose the issue related to OBDII code P0730?
- Diagnosis typically involves checking the transmission fluid level and condition, performing a visual inspection of transmission components, and using a professional scan tool to analyze transmission data.
4. Can driving with OBDII code P0730 cause further damage to the vehicle?
- Continuing to drive with this issue can potentially lead to additional damage to the transmission, resulting in more costly repairs.
5. How can I repair OBDII code P0730 Incorrect Gear Ratio?
- Repairs may involve refilling or replacing transmission fluid, repairing or replacing faulty transmission components, or reprogramming the transmission control module.
6. Is it safe to continue driving my vehicle with OBDII code P0730?
- It is not recommended to drive the vehicle with this code as it can lead to further transmission damage and safety risks. It's best to address the issue promptly.
7. Can a DIY enthusiast fix OBDII code P0730 at home?
- Depending on the underlying cause, some repairs related to this code may be feasible for DIY enthusiasts with the necessary skills, tools, and knowledge of automotive systems.
8. How much does it typically cost to repair OBDII code P0730?
- The cost of repairs for this code can vary significantly based on the specific issue, parts needed, labor rates, and whether professional services are required. It's best to get a diagnosis and estimate from a reputable mechanic.
9. Are there any preventive maintenance tips to avoid OBDII code P0730?
- Regularly checking and maintaining the transmission fluid level and quality, following the manufacturer's recommended service intervals, and avoiding aggressive driving can help prevent issues leading to this code.
10. Can resetting the Check Engine Light clear OBDII code P0730?
- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue causing P0730 is not addressed, the code is likely to return. It's important to diagnose and fix the root cause of the problem.
Discuss the causes and fixes for P0730 OBDII Code
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Thank you, that makes perfect sense. A great, no nonsense answer that is written in plain English and not trying to sell you anything. Thank you.
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