droopwv

Check engine light came on. Giving this code P1817. Can anyone tell me what this code means? Thanks.

screw991le

http://www.corvettedoctor.com/2004_DTC_Codes_Page2.html

droopwv

forgot to mention that I checked for the code on Corvettedoctor.com and could not find it listed.

Mike Mercury

DTC P1817 TFP Valve Position Sw. - Reverse With Drive Ratio

???

JackTsDBG

This isn't even listed in the shop manual, not mine anyway (2001). TFP Valve Position Sw - refers to the automatic Transmission Fluid Pressure switch.

JimK-98

manufacter control transmission

droopwv

Thanks for the answers. Gonna wait til after the holidays and call my mechanic. I don't have a clue.

0Chuck CoW

Don't quote me on this, but......I'm pretty sure that it is a failure of one of the trans pressure switches or circuits. The A4 trans has a sensor plate attached to the valve body which provides feedback to the pcm which tells the pcm when a particular fluid circuit is fully pressurized. (or shift is complete). It also uses the switches for a complex adaptive learn function which tells the pcm when components of the trans are wearing so that it can maintain shift timing by increasing fluid pressure to compensate for wear...Again, don't quote me here but I seem to remember that when a failure occurs here (if the trans dosen't go into limp mode) it commands full line pressure to help the trans get you to service....not good to drive around this way...


Have someone look at it soon.

Hope this helps...

Chuck CoW

droopwv

Thanks for the info. I am not driving it--thankfully I have a second vehicle that I can drive. Going to play in the snow til after the new year and then I will worry about getting it fixed. I appreciate all the answers anyone might have.