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98 Accord code P0730 Gear Ratio Incorrect

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Aug 5, 2012, 5:58 PM

Post #1 of 5 (8619 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 ?

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Aug 5, 2012, 8:56 PM

Post #2 of 5 (8579 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 (8567 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 (8547 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 (8451 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.


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