AutoCodes – Oldsmobile – P0730 Oldsmobile

P0730 Oldsmobile Code - Incorrect Gear Ratio

Quick Answer

This diagnosis monitors the actual gear position by checking the torque converter slip ratio calculated by the Transmission Control Module (TCM) as follows: Torque converter slip ratio = A x C/B A: Output shaft revolution signal from the 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 Oldsmobile 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.

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Code Popularity 4,630

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 26, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0730 Oldsmobile Description

This diagnosis monitors the actual gear position by checking the torque converter slip ratio calculated by the Transmission Control Module (TCM) as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from the 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.
The Diagnostic Trouble Code (DTC) will set when the TCM has detected that the transmission is trying to mechanically shift to a lower gear than intended.

OBDII Code P0730 Oldsmobile - Incorrect Gear Ratio - AutoCodes.com — P0730 Oldsmobile Code - Incorrect Gear Ratio

What does this mean?

What are the Possible Causes of the DTC P0730 Oldsmobile?

Low transmission fluid level
Dirty transmission fluid
Shift solenoids
Transmission mechanical problems
Transmission hydraulic control circuit

How to Fix the DTC P0730 Oldsmobile?

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.

What does this mean?

Code Tech Notes

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

There is a factory service bulletin for the following Oldsmobile models:
2000-2002 Oldsmobile Intrigue
2000-2003 Oldsmobile Aurora
2000-2004 Oldsmobile Alero
2000-2004 Oldsmobile Silhouette
Oldsmobile Factory Service Bulletin OBDII Code P0730

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0730 Oldsmobile 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.

Need more information about the P0730 Oldsmobile code?

Need more information on how to fix the P0730 Oldsmobile code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0730 Oldsmobile code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0730 Oldsmobile Code

1. What are the common symptoms of OBDII code P0730 (Incorrect Gear Ratio) in an Oldsmobile?

Symptoms may include slipping gears, hesitation or jerking during acceleration, decreased fuel efficiency, and illuminated check engine light.

2. What are the possible causes of OBDII code P0730 in an Oldsmobile?

Potential causes include low transmission fluid, a faulty transmission control module, worn or damaged transmission components, or issues with the torque converter.

3. How can I diagnose the OBDII code P0730 in my Oldsmobile?

Diagnosis usually involves using a scan tool to retrieve and interpret the error code, checking the transmission fluid level and condition, and inspecting the transmission for any visible damage.

4. What are some repair tips for addressing OBDII code P0730 in an Oldsmobile?

Repair options may include performing a transmission fluid flush and filter replacement, inspecting and replacing damaged transmission components, recalibrating the transmission control module, or seeking professional assistance for complex repairs.

5. Can driving with OBDII code P0730 in an Oldsmobile cause further damage?

Continued driving with this code may lead to further damage to the transmission components, potentially resulting in more extensive and costly repairs.

6. How much does it typically cost to repair OBDII code P0730 in an Oldsmobile?

Repair costs can vary depending on the specific cause of the issue and the extent of the damage, but they may range from a few hundred to a few thousand dollars, especially if major transmission components need to be replaced.

7. Can I reset the OBDII code P0730 in my Oldsmobile by disconnecting the battery?

While disconnecting the battery may clear the error code temporarily, it is not a recommended long-term solution, as the underlying issue causing the code will still need to be addressed to prevent further transmission problems.

8. How can I prevent OBDII code P0730 from occurring in my Oldsmobile?

Regular maintenance, such as checking and changing the transmission fluid as recommended, keeping up with scheduled service intervals, and addressing any transmission issues promptly, can help prevent this code from appearing.

9. Is it safe to continue driving my Oldsmobile with OBDII code P0730 if the symptoms are not severe?

It is generally not recommended to continue driving with this code present, as it can lead to increased wear and potential damage to the transmission over time. It is best to address the issue promptly to prevent further complications.

10. Can a DIY enthusiast repair OBDII code P0730 in an Oldsmobile, or should I seek professional help?

While some basic maintenance tasks may be manageable for a DIY enthusiast, diagnosing and repairing complex transmission issues like P0730 often require specialized tools and expertise, making it advisable to seek professional help for accurate diagnosis and repair.