Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

98 Accord code P0730 Gear Ratio Incorrect

  Email This Post


Aug 5, 2012, 5:58 PM

Post #1 of 5 (7918 views)
98 Accord code P0730 Gear Ratio Incorrect Sign In

1998 Honda Accord 6 Cyl with 159,230 miles is intermittently jumpy/shaky on starting from a stop sign or traffic light.

It appears as if the tranny is not downshifting properly. Could this be a vacuum problem or a sticking solenoid ?

Veteran / Moderator

Aug 5, 2012, 8:56 PM

Post #2 of 5 (7878 views)
Re: 98 Accord code P0730 Gear Ratio Incorrect [In reply to] Sign In

According to the trouble chart you have to first measure the 1st,2nd, 3rd, and 4th clutch pressures and make sure they are within specifications. If so, then you start replacing solenoids.

I don't agree that you should just go and start replacing stuff without testing it to see if it actually bad, so I would test the solenoids' electrical circuits, windings, and drivers with a O scope and some sort of bi-drirectional control via a scan tool to confirm solenoid and circuit integrity.

Here is the manufacture's trouble chart for P0730:

DTC P0730: Problem in Shift Control System
- Record all freeze data before you troubleshoot.
- Keep replacement solenoid valves on hand:
- Torque converter clutch solenoid valve/shift solenoid valve A
- Shift solenoid valves B and C
- A/T clutch pressure control solenoid valves A and B

1. Check whether the OBD II scan tool indicates another code.
Does the OBD II scan tool indicate another code? YES - Perform the Troubleshooting Flowchart for the indicated Code(s). Recheck for code P0730 after troubleshooting.
NO - Go to step 2.

NOTE: Do not continue with the troubleshooting until the causes of any other DTCs have been corrected.

2. Measure the 1st, 2nd, 3rd, and 4th clutch pressure.
Is each clutch pressure within the service limit? YES - Go to step 3.
NO - Repair the hydraulic system as necessary.

3. Replace the torque converter clutch solenoid valve/shift solenoid valve A.
4. Replace the shift solenoid valve B and shift solenoid valve C.
5. Replace the A/T clutch pressure control solenoid valves A and B.
6. Turn the ignition switch OFF and reset the PCM memory by removing the BACK UP fuse in the passenger's under-dash fuse/relay box for more than 10 seconds.

7. Drive the vehicle at a speed over 12 mph (20 km/h) in 1st, 2nd, 3rd, 4th gear in D4 position for more than 30 seconds.

8. Recheck for code P0730.

Does the OBD II scan tool indicate code P0730? YES - Replace the transmission.
NO - The system is OK at this time.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Aug 5, 2012, 8:58 PM)


Aug 5, 2012, 10:34 PM

Post #3 of 5 (7866 views)
Re: 98 Accord code P0730 Gear Ratio Incorrect [In reply to] Sign In

That is a wealth of info. Thanks.

I don't just start throwing parts at any problem, so this is a great help in troubleshooting this problem. I was able to give it a good test drive just a while ago, and it is getting progressively worse - slipping and not downshifting properly. Turning into a parking garage and as I started to go up the first ramp, the RPMs went way up and then the tranny slammed into gear actually spinning the tires.

So there is lots more troubleshooting to be done, and you have given me a good start.


Aug 6, 2012, 8:29 PM

Post #4 of 5 (7846 views)
Re: 98 Accord code P0730 Gear Ratio Incorrect [In reply to] Sign In

We finally exceeded my pay grade and my friend is going to take the car to a genuine full service tranny shop Eagle in the Dallas/Plano area run by the straightest shootin Texan I've ever met.

When it's done, I'll come back with the details of the fix.

Again, I appreciate all the info.


Sep 2, 2012, 1:05 PM

Post #5 of 5 (7750 views)
Re: 98 Accord code P0730 Gear Ratio Incorrect [In reply to] Sign In

The fix was to completely re-build the transmission. He got what I think was a righteous price, and the car is running like a gazelle from a Cheetah.

98 Accord code P0730 Gear Ratio Incorrect

  Email This Post

Latest Forum Post
Hello I am having a passenger window issue... front window. 2004 VW Beetle Conv...
my car started, hard starting 6 mos ago, then wouldn't start at all,the x's frie...
2000 dodge caravan 3.0 150,000 miles. I replaced a friends timing belt and wate...
The "clicking" noise happens when the turn signal is not activated
2002 Hyundai Accent. Cannot get any electric when turning key. Tried to jump s...
had problem with break light staying on. tapped the switch on the master cylinde...

Feed Button

Used Car Search
Used Car Price Ranges:
Under $5,000

Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
2004 Jeep
2012 Mustang
1997 Honda Cr-V
2010 Toyota Prius
2010 BMW 328

Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice

Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap

Search for (options) Privacy