Trans

[sho man]

I have a 97 SHO and my trans overdrive light is blinking and it shifts hard into second gear. I had it checked for code but no codes came up. Any thoughts?

 

[SHOZ123]

When was the fluid changed last? And do you know what fluid is in the trans now?

 

[peglegtom]

Does it Shift into OD?

or only stay in third? If it doesn't shift into OD, search for the C-clip fix. Didn't work on mine, but worth a check.

 

[sho man]

It was changed about 3 months ago. I'm not sure what kind of fluid was put in. I will find out. It does shift into overdrive.

 

[byersmith]

possibly speed sensor but that would usually throw a scan-able code? Un-hook your battery and reset your computer. If the light stays off and it shifts fine its probably trans electronic failure. Had a customer in the other day with the same issue and it WAS the speed-sensor with NO trans codes whatso ever. Just a guess at the most minor thing. If the fluids uber black, Your steels and frictions are probably burnt, and its time for a re-build, but yet thats coming from a trans rebuilder viewpoint.

Byersmith

 

[sho man]

I will try that. Thanks for everyones help!

 

[rubydist]

According to my manual, a flashing od light will always set a code - perhaps you need to use another code reader...

 

[1bad98SHO]

my flashing O/D light was caused by a failing TFT sensor(Transmission Fluid Temperature).

This tells the PCM to change the shift strategies depending if its cold or hot.

 

[SHOZ123]

The flashing OD light will not set a code if the fluid overheats, for instance. Actually it is the TFT going out of range at +300F. But if you shut the car off and the fluid cools then the light stays out and there will be no DTCs to collect.

 

[sho man]

I'm going to look into the TFT sensor. It seems to do it after the car warms up. Thanks for all of the info!!!