A3 automatic problem

sajid.ahmed

hi all i have audi a3 1.6 automatic yesterday in dash PRNDS light went red car loose the power now it stars fine but when put in gear car wont move forward or in reverse what can i do? does anyone knows good mechanic around carlow i know best option in audi dealer but i am trying to find little reasonable person thanks for your help

colm_mcm

can the engine rev up properly when gear is in P or N

sajid.ahmed

no its not actually its happening nothing when i put in d or r or p

colm_mcm

It may not be a gearbox problem then.

sajid.ahmed

what it could be then coz car starts fine engine running fine the light in dash PRNDS is red when put her in d it wont move please advice me anything if you know

colm_mcm

Is the prnds flashing?

What year is the car?

sajid.ahmed

its not flashing its constant red instead of orange its 04 a3 1.6

colm_mcm

You basically need to find a garage test has VCDS, they will scan and search for faults. It could really be any number of things from a sensor on the gear lever to an entire control module.

You could try BC motors in Carlow.

sajid.ahmed

thanks for your help where about is bc motors car is not drivable so they probably needs to come over to tullow

biko

Does it look like this?
http://i1115.photobucket.com/albums/k551/de0412/IMAG0108-1.jpg


https://www.youtube.com/watch?v=el3l5seIdJI

Could be an issue with the TCM - Transmission Control Module

Codes needs to be read and TCM might need to be replaced, mech will know.

colm_mcm

Portlaoise road in Carlow,
Assumed you were in Carlow town. Sorry.

sajid.ahmed

yes exactly look like that

biko

If car is still in warranty check with dealer.
Actually ring dealer anyway, they may know of a recall or something, worth a shot anyway. Good luck

sajid.ahmed

well i did manage to get a local lad to check the car his computer says 17105 transmission output speed sensor G195 implausible signal p0721 not a plausible signal
do you have any idea what it could be?

Waterson

There are two sensors that read the input and output speeds of the automatic transmission. I dont think failure of either of these sensors would cause a no shift/drive problem, but would probably just trigger a warning light. Was there a light on before the selector failed to shift? It sounds like the transmission control module may be in a limp home mode, for any number of reasons. Your man with the VCDS should be able to get a freeze frame snapshot of that fault code. Just check whether the fault code occured at the same time/mileage as the no start or whether it was logged at an earlier mileage than what is currently on your odometer? Have you had any gearbox oil leaks underneath the car, pull the undertray and visually inspect all the connector to the box, checking especially for any signs of fluid ingress around electrical connectors.

sajid.ahmed

thanks for detailed reply i check and he checked that car is totally dry underneeth no there was no light or anything at all it just happen all of sudden last year we got gear box serviced with no issue what so ever
the guy mention that speed sensor is built inside the gear box to check that we needs to open all gear box if its just a speed sensor it would cost us around 400 euros but if something else come out we might never know until open it what should we do what is your best advice

Waterson

Id be fairly certain the speed sensor is external to the box and is bolted on using a 5 mm allen key bolt. It has a short electrical cable terminating in a 3 or 4 pin connector IIRC.