Just need some advice.....error code reads p0734 4th gear incorrect ratio.....does this sound like it could be a bad solenoid or maybe something internal on the transmission.....big difference in price cost....I'm just trying to weigh my options

 

I had the same code on my 05 Dakota. It occured just after the factory warranty expired. Luckily I got off with disconnecting the battery to reset the code and it never returned... but I had this info bookmarked on a dodge forum. I assume it would be along simular lines... So possibly a sensor?!?!

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P0734-GEAR RATIO ERROR IN 4TH

When Monitored: The Transmission gear ratio is monitored continuously while the Transmission is in gear.

Set Condition: If the ratio of the Input RPM to the Output RPM does not match the
current gear ratio.

Theory of operation: The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks:
1. When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (codes 50 through 54).
2. An excessive change in input or output speeds indicating signal intermittent will result in codes 56 and/or 57 being set.
3. After a PCM reset in neutral, observing erratic output and input speed sensor signals indicates a loss of the common speed sensors ground. This
sets a code 58.

Transmission Effects: The transmission will not go into Limp-in mode until three gear ratio error events occur in a given key start also the MIL will illuminate after 5 minutes of substituted operation. This allows for intermittent problems to correct themselves without opening the relay. However, if a gear ratio error develops, a code is always set, but if the condition corrects itself the transmission will continue without requiring the ignition key to be cycled on and off.

POSSIBLE CAUSES
> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first
> Failed or slipping OD clutch - may also set code P0733(53)
> OD and Reverse inner and outer lip seal leakage (usually hard code)
> Sticky OD accumulator seals (intermittent)
> Worn reaction shaft support seal rings (hard code at heavy throttle)
> Broken OD/UD tapered snap ring - (hard code at heavy throttle)
> Failed or slipping 2/4 clutch - may also set code P0732(52)
> 2/4 seal leakage (intermittent)
> Sticky accumulator seals (intermittent)

 

In reading the threads this seems to have a possible solution for me. I bought a 2012 with 15K on it 2 months ago and have had transmission problems. It constantly goes into limp mode AND slips in fourth. Techs at two shops say they can't do anything without an error code. Wow, I miss the pre electronic age of cars! In the two months I have had one code that was a "bad 2nd gear ratio" the response here showing the connection between 2nd and fourth may be what I'm looking for. Something else that has come up was that the transmission control unit had reset to some base setting for tire size (235/75 r16) where the factory tires were 25575 R17. This was reset to the factory tire size which was still on the vehicle. Apparently the dealer changed the rims to be wider (10" ?) with an extra 1.5" offset; possibly throwing another wrench in the issue.

Fourth gear slips about every time it hits and 3rd sometimes hangs. I assume that's a fourth gear issue though. Maybe the 2nd 4th gear connection, the 2nd gear trouble code and 4th slipping may bring things closer to a solution

Could it be the wheel change? It still has stock tires...

 

I'm kinda having the same problem. Mine gets hung in 3rd gear and I'll have to go neutral, go back into drive then it'll shift to forth. I have a 2012 JKU rubicon.

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