P0730: Incorrect Gear Ratio
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Only gently and locally - incorrect ratios often mean internal slipping, and continued driving grinds up expensive parts.
Symptoms
- Engine revs without matching acceleration (slipping)
- Flare between shifts
- Burnt smell from fluid
Likely causes, most common first
- Low or burnt transmission fluid
- Worn clutches or bands inside the transmission
- Faulty solenoids or a failing torque converter
Read P0730 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0730 means the transmission delivered a gear ratio the computer did not command - the mechanical definition of slipping. Fluid problems can cause it, and everything worse also causes it.
Check fluid immediately: dark, burnt-smelling fluid alongside this code is a transmission announcing its condition. Driving on a slipping unit converts a repairable problem into a core exchange; that is why this code sits high on the severity scale.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0730
“Our vehicle experienced total transmission failure with no warning while I was driving on a narrow country road. The car shifted into neutral, and I was unable to go anywhere, so I sat in the middle of the road with hazard lights on in a state of panic. We had the car towed to a nearby Honda dealership and were informed of the transmission failure, which was identified through a diagnostic test. Codes that failed were listed as: P0730; P0700; P07A6; P07A8; P07A4. I have owned the car for one year and three months (purchased October 2024 for $34,000). I am being told it is just past the power train warranty, and Honda is not offering any assistance in covering the repair cost - $10,000.”2022 Honda Passport · Jan 2026
“Slipping , shift feels like it's losing power and jerks and sputter . Check engine lights is on now . Throwing a P0730 code .. transmission fluid level are where is supposed to be and clean”2002 Acura TL · Apr 2023
“Vehicle stalled with no warning signs while I was driving and went into limp mode, took it to a jeep dealer to check it out. They say the jeep needs a whole new transmission. Will not drive at all but has power. Only has 112,000. Codes: p0777 - pressure control solenoid b - stuck on, p0741 - torque converter clutch solenoid - stuck off, p0730 incorrect great ratio”2016 Jeep Patriot · Jan 2021 · 112,000 mi
Show 7 more owner reports
“Vehicle would not excelerate and almost got into an accident while on highway. No warning was given beforehand, just suddenly acted this way. I had to turn my car off then on quickly to get it going because it wouldnt go. It then tells me there is a transmission problem. I then had to go 40 mph and no more as it wouldnt let me go faster. Took to an auto place and told me cvt belt slips repeatedly and powder enters the thing. P0776, p0730, p0741, pour a, p0969, p2719. These are the things given to me by auto place.”2016 Mitsubishi Outlander · Jan 2020 · 66,669 mi
“Car is unable to transfer to higher gears. Error code p0730 and p0777. 84k miles. Two shops stating new transmission needed.”2012 Jeep Patriot · Mar 2019
“Takata recall. I could feel my car was not shifting properly then finally my check engine light came on & I went & got the code p0730 read it came back as gear ratio. Something to do with the inside of the transmission.”2013 Dodge Durango · Jan 2019 · 111,000 mi
“Transmission - car died on the highway. Had it towed to the mechanic. Service code that appeared was p0730, and I need a new transmission. Car has 140k on it, is a 2002 honda civic, I'm the only owner, and I have serviced this car completely by the book. I just spent $1200 for the timing belt and water pump last month as a preventive measure, $150 on the battery in jan 2017, tires <7k miles ago, brakes last nov, and now a $5000 estimate given to me by the dealership in order for them to replace the transmission.”2002 Honda Civic · Mar 2018 · 140,000 mi
“The van started running rough and started jerking. The gears were not shifting well and got an error message p0730. It was very unsafe and we were lucky not to have been driving on freeway. Huge safety issue .”2017 Acura MDX · Jul 2017 · 3,500 mi
“Tl* the contact owns a 2010 dodge challenger. While driving at 70 mph, the vehicle stalled while trying to accelerate and the transmission warning signal illuminated. When the vehicle was restarted, the warning signal light was not illuminated. The vehicle was taken to the dealer for diagnostic testing. The result was a p0730-improper gearing. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 35,500.”2010 Dodge Challenger · Jul 2015 · 35,500 mi
“Submission from constituent re recall 04-021:c "automatic transmission recall for honda odyssey 2003" (full document not imaged). *smd the consumer stated according to an emission testing center, there was a problem with the transmission, the computer gave two codes, p0730 and p1750. The consumer was informed, the transmission recall, was performed on her vehicle in the past. However, the problem has since returned. *jb”2003 Honda Odyssey · Oct 2014
Cars that report P0730 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0730?
Only gently and locally - incorrect ratios often mean internal slipping, and continued driving grinds up expensive parts.
How much does it cost to fix P0730?
Typical US repair costs range from $150 for the simplest fix (fluid and filter service) to $6,000 in the worst case. The right number depends on which cause your car has - see the causes list.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.