i have a 98 audi a4 1.8tq automatic tip 145,000 miles on it. it is stuck in limp mode i think cuz the factory radio says safe and the check engine, abs,air bag lights are on. It feels like its stuck in 4th gear wen u put it in drive.. but wen u put it in a gear it jerks the car, and its kinda ruff to get it in gear... but the cluster dosent lite up any gears like my other audi does. i checked all the fuses and there good. the guy before me, had the tranny cooler lines hooked to a copper pipe tht interlooped the fluid, so i put a hayden transcooler and tht didnt do anything. so a transmission guy told me to take the two ends off the battery terminals together for 20 secs and itll clear all codes. i did and it worked but still in limp mode. i dont belive the tranny is bad. is there anything to check before i give up and buy another tranny? i did hook my vag-com to it but it didnt show any codes at all while the check engine light was on.... any ideas i would gladly appricate it.

 

I would check your TCU to see if it's sitting in water. But I doubt it if vag-com didnt pull any codes for it. Last I would jack the car up and drop your tranny pan If you see a lot of gray "fuzz" on the magnets start saving for a new transmission. Check and report back.

 

How do i get to the tcu and transmission pan? There is water in my backseat floor so ill drain the plugs in the engine bay... thanks again

 

The TCM=transmission control module is located under your passenger side floor panel. This is the cpu that controls your tranny.

You should be getting incorrect gear ratio codes soon,if the jerking persists,this happend to me,where my tranny would not shift into 4th or 5th gear,it would shift from 1st to 3rd with no problem,when the TCM sends the signal to shift into 4th gear,the tranny jerks the car,then the gear shift back down to 3rd.

I since have replaced my tranny 2 month ago,no more shifting issues,i can shift in all higher gears now on my 01 A4 1.8T AWM Automatic

 

Yours is sounding like mine did except I had no other lights on. Just had 4th gear and reverse. On the instrument cluster the gear indicator was blank. I checked out all the fuses and wiring but nothing wrong there. I pulled the front passenger side seat and removed the kick panel and pulled back the carpeting to find the foam soaked and dripping wet. This has been leaking so bad and long that the floor boards are rusted out on that side. I am pissed at AUDI for this mess. Anyway I got another TCU and replaced mine and the tranny is back to normal now. I took a squirt bottle and ran water down the right front sun roof drain and it wasn't plugged. But had I not had the kick panel out I wouldn't have seen the water dripping behind it. Seems 90% of the water went out the bottom of the drain but 10% dripped behind the kick panel and rotted out the floor. BTW the TCU in mine was inside a plastic box which kept it dry. It was just bad not wet.

Good Luck!

 

update: i took the advice us gave me and the carpet was soaked, under the carpet were the tcu was has an inch to two inchs of water. the plastic box was full off water... the plastic box on the inside actually has mold in it... here are the pics. im planning on pulling the seats out and the carpet try to dry it and get rid of all the water out of there. and there was allloooottt of water under the battery, the plug was clogged. i really apricate the help. ill update once i get a tcu..\

 

Its been call after call and looking thru the internet including ebay and no one has 8D0 927 156 BJ.... ppl have BM,BQ,BR.... ect. if someone can help me out i would gladly appreciate it. i dont mind waiting its just at this point i dont think ill find one at all. its just them two letters BJ... am i missing something? and if i find one wat do i look for? year, make, model, engine, quattro not quattro ?

 

You're not posting all the info about your car,quad or none quad? where do you live by the way?

 

sorry.. 1998 audi a4 1.8tqa i live in harrisburg, pennsylvannia

 

search for a TCM on this site,www.car-part.com I found 3 for my 01 A4 awm,cheapest was 100.00,most was 145.00 used ofcorse but they're functional.

Good luck....