P0730: Incorrect Gear Ratio OBD-II Trouble Code

In This Guide

The P0730 OBD-II code is a generic trouble code, meaning it applies to all makes & models of vehicles from 1996 to present. It can be caused by anything from shift solenoid problems to dirty transmission fluid. We will explore this trouble code more closely below.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Does P0730 Mean?

“Transmission Control System Malfunction” is the definition of OBD-II Trouble Code P0730.

By automatically selecting different “speeds” or gear ratios to deliver power to the wheels, an automatic transmission’s goal is to match the optimal torque and power characteristics of the engine to the desired speed and rate of acceleration of the driver.

When the TCM (or transmission control module) sees an RPM difference (rotational speed) between the transmission output RPM sensor and input RPM sensor that is greater than a certain value, the P0730 code is triggered. This can happen while shifting between gears or when driving at a steady speed in a particular gear.

Symptoms of P0730

  • Illumination of the Check Engine light
  • Fuel economy decreases
  • Shifting of the vehicle is delayed or goes into wrong gear
  • Transmission slipping
  • There may be misfire-like symptoms, dying when coming to a stop after freeway driving, or other performance issues in some cases
  • The driver may not notice any adverse conditions in some cases

Common Causes of P0730

  • Faulty torque converter clutch
  • Faulty shift solenoids
  • Blockage on the inside of the transmission main control
  • Internal mechanical failure of the transmission
  • Blockage in fluid lines
  • Clogged fluid filter or worn pump
  • Dirty or low transmission fluid

How to Diagnose the P0730 Code?

The level of fluid in the transmission should be noted and checked for quality before doing any other diagnostic tests. You should replace any dirty or old fluid.

In the hands of a qualified mechanic, an OBD-II scanner diagnoses the P0730 code. With this, they can view any needed info from the engine in real-time. The technician will take the vehicle for a test drive after clearing the code.

The code is due to an actual condition within the transmission if it comes back again. To determine if the engine stall speed fits factory specifications, the mechanic might perform a torque converter stall speed test.

Common Mistakes When Diagnosing

Common misdiagnoses include an internal transmission problem and engine misfire. The symptoms you are experiencing may simply be due to dirty or low transmission fluid. The transmission problems that are causing the trouble code may be resolved by simply replacing or topping off the fluid.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Repairs Will Fix the P0730 Code?

  • Wires connecting sensors to the transmission control module and other electrical connections should be inspected.
  • Any damaged or corroded wires in and near the transmission control module should be repaired or replaced.
  • Parts in the transmission might need to be repaired or replaced if the transmission wiring and fluid are all in working condition.
  • The transmission must be removed if there is a problem with the torque converter, shift solenoids, or pump.
  • To be sure that it operates without the P0730 code or any other trouble codes, the transmission should be reinstalled and inspected once the needed repairs are completed and before testing.

Codes Related to P0730

  • P0729
  • P0731
  • P0732
  • P0733
  • P0734
  • P0735
  • P0736

Need more help with a P0730 code?

If the above guide does not answer your questions, comment below with the code(s) and symptoms you are getting along with the make, model, and year of your car.

Your Name
Email Not Required
28 Tell us about your transmission problems
Inline Feedbacks
View all comments
2 months ago

I have a 2009 dodge challenger SRT with about 38,000 miles I was driving and felt a slight jerk the check engine light came on also it didn’t seem to accelerate so I pulled over right away shut the car off turn it back on check engine light was still on but it seem to drive OK got back home put the scanner on PO730 incorrect gear ratio popped up I reset the code I did not drive it yet

Dominador Pajarito
2 months ago

The engine trouble light is on- P0730 Code

Ai long
6 months ago

How can I fix
Code p0730 for Honda Odyssey 2000

So long
6 months ago

2000 Honda Odyssey 3.5 tl
How I correct rear ratio
Code p0730

8 months ago

The transmission was slipped but I oily swap out one sensor and then it worked for a while now it’s back slipped

8 months ago

This is my first acura my me i smell brun fluid. But I’ve took 0jut. Sensor and. It stopped but took it for a 50 miles then it stared splitting again but I didn’t change the fluid and clean all the Sensor should I go ahead and redo it the right way and put fresh fluid and clean all six sensors and the clutch sensor because the fluid smell brunt also what should i do now

1 year ago

It’s weird because I drive my car in automatic and it stalls it doesn’t catch gears and it kicks gears but whenever I drive it on semi-automatic and control the gears it drives perfectly can anybody explain that

1 year ago
Reply to  Trin

Mine does the same thing 2013 super bee 6.4L 392

1 year ago

I have a 2010 Ford Explorer Eddie Bauer, transmission (5R55S) I hear a loud sound coming from the front end but only around 10-20 mph, every time at this speed. I’ve placed it in neutral and still hear the sound, also there was a loud BANG like it got stuck in a gear and then released. After this is seemed to resolve the issue for ten mins….then the sound came right back. I have NO OTHER issues with the transmission. I took it to two dealer mechanics, one said it was a bad transfer case (replaced)- didn’t resolve it) then the other said its a bad front end differential (replaced and didn’t resolve it. No codes come back on the test and no warning lights are on the vehicle. I had the wheel bearings replaced along with brakes and rotors, issue is still there. The transmission has been flushed and conditioner for the transmission along with fluid replacement, sound is still there at 10-20 mph. It first started when I would turn but the power steering pump is fine. NO mechanic at the Ford dealership can figure it out.

1 year ago
Reply to  Mike

Mine does the same things your does have you figured it out yet

1 year ago

Hi my 2016 Hyundai ELANTRA put out code P0731, for my transmission. It also said incorrect 1 Gear ratio for the same code. The car has 106,000 miles on it and at Pep Boys they’re telling me the transmission is shot is this true?

1 year ago

2013 jeep compass at around 40-45 mph won’t shift in to overdrive. Just serviced transmission. P0730 code on engine light. But light went away but still nothing

Heather hall
1 year ago

2004 Civic ex 1.7 liter let me start by saying all this started happening after a friend used my car and I guess someone needed a jump and they hooked up the battery cables wrong and fried all my sound system wires and was having trouble with the Bartlett there for awhile but it seems to be doing ok I don’t have to get jumped myself anymore and had to replace the backup and the other fuse now let me begin on details, I can start the car fine in the morning and make it to work just fine after work is when I make it out of first gear smoothly and about 3000 or 4000 rpms car just revs really high and when the gauge goes down between 2/1 rpms it bounces or pulses a lil and whenever I come to a stop and try to take off and it just revs till I shut it off and restart it and then it runs again till the next time, same as with reverse, but today I barely made it home had to pull over and and shut off car about five times just to make it there also boggles here and there makes weird noise when I make a turn, under hood there’s a weird sound that comes from around the intake or air filter area that comes and goes stays on more than off but, there’s a clunk when I put the car into park, and sometimes when pressing on the gas and it revs it sounds like when a manual car shifts and doesn’t get it into gear right whatever sound that is now I am a single mom with cancer who is just trying to make ends meet so finds to take to a shop is unlikely so I work on the car myself I have changed spark plugs and air filter so far going to replace transmission filter n fluid next but something in my gut says it’s not the transmission per say specifically, my fluid is still red not low and non gritty that I have seen when checking it can anyone help me with this please I keep up all night trying to figure this out

mike M.
1 year ago

i have a 2000 honda crv with an on going p0730 code .ive replaced the transmission twice [last one is a OEM honda] has all new shift solonoids[honda] has new input & output speed sensors[honda] . freeze frame data shows code sets at 10MPH 700 RPM. car runs fine & shifts fine . i was reading it could be an ECT sensor. any ideas?

2 years ago

On my 2006 Chrysler 300 c I had a code p0730. Changed tranny fluid and filter as it was contaminated. Ran great. Later on a few months after setting in my driveway I tried to drive it it was back to the same place. Won’t drive. Makes a whining sound when you start the car. When you start the car tranny works for a minute then nothing.

Chuck G
2 years ago

I have a Jeep 2016 JKU Rubicon I receive the code P0730 and it went into limp mode but then my engine stopped and I could not get it to start. it doesn’t do anything and my battery is fine. Also the gear shifter doe snot line up with the proper gear spot.
I can find neutral however the engine still wont start any ideas?

2 years ago

I have a Dodge Charger 2014 saw a engine light on the dashboard checked the code with a carmd diagnostic and it showed po730 what do I do?

My name is God's will
2 years ago
Reply to  Dayo

The Gear did not selected it remain on one gear

1 year ago
Reply to  Dayo

Hey dayo do you still have the problem with Your 2014 charger?

Joe G
1 year ago
Reply to  Dayo

I just got this on my 2014 Charger RT. It has happened a few times now, and yes it usually gets stuck in a gear when it happens and the transmission cuts out for 20-30 seconds. Its in the shop for it now so ill update.

Jon noble
1 year ago
Reply to  Joe G

My 2013 srt8 is doing the same did you guys figure it out yet?

2 years ago

Truck tries downshifting over and over when accelerater pedel is pressed. Pedal is not fully pressed however truck continues to try downshifting

Salifu alhassan
2 years ago

I have a problem with VW Jetta p0730

1 year ago

I have a vw Jetta 2.0 and the P0730 is the problem it does not change in to the 3 and4 gear.

Wendy I
2 years ago

2004 Honda Odyssey ex-L with 200,000 miles. Tcs and cel lights came on as well as a few flashes of the d light. Codes read were P0730, P0780 and P0705. Any ideas as to what the problem could be from the reading of these 3 codes?

2 years ago

P0730 improper gear ratio code in a Honda odessey 2002 it keeps down shifting hard and not going threw all the gears

2 years ago
Reply to  Jason

Ever figure out the issue

2 years ago

Swap e320 torque coverter with s600 v12 converter and P0730 code is the fault code can the converter be the problem

Would love your thoughts, please comment.x