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My 2001 C4 Automatic had what appeared to slip (over rev) when making scarp turns, decided to replace transmission filter and refill, the first run after 10 minuets the transmission went into limp mode (lights on drive selector started to flash) check engine lamp came on (P0734 and P0734) was read. the reason given was input and output ratio wrong for both codes.

The Durmatic gave no other info. So I proceeded to  order both input and output sensors. Since I couldn't confirm if a shift selonod was bad. Mean while I am in Cal for the holidays I remembered I moved two of the magnets in the pan there were 4 magnets 2 each in the depressions in the rear of the pan I took one each and moved the forward closer to the input and output sensors.

Anybody out there have any idea besides taking it to the dealer, at 75 bucks for the 5 liters of tranny oil each time I replace something to help me be smarter?

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Those codes possible faults are:

 

ATF level not OK
Mechanical/hydraulic fault in transmission (e.g. solenoid valve does not operate despite correct electrical triggering

 

Did you fill the transmission using the temperature probe for proper fill level?  If not, that might be the simple solution.

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yes double checked after codes showed up since the Druamatic cannot read this transmission used infrared temp gage on the pan, used level on door sill to ensure car level.

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 I just got back from San Francisco, the car sat since Nov 20th. Jacked it up leveled it ran it till 80 degrees C while running in park opened check port and fluid ran out I let it run out till it stopped. So I don't thing low fluid was a problem. Rolex start next week, if I run it and it goes into limp mode will it hurt driving it? If I turn of the car and restart the limp mode goes away for a bit than in heavy traffic or stopping at a light it will come on again. I'm 11 miles from the speedway.

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