'98 A4 is throwing Code P1518

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Sep 25, 2006 | 04:33 PM

98C5RT

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Burning Brakes

Joined: Jul 2005

Posts: 998

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From: Somewhere between the Red and the Rio Republic of Texas

'98 A4 is throwing Code P1518

I already know that it's my TAC Module Serial Data Circuit; but the question is what needs to be done to correct it or what needs to be replaced? The problem will happen intermittently and says "service traction control sys..reduced engine perf" then the check engine light comes on. The car will not rev above idle speed. If the engine is restarted it runs fine for awhile then the problem repeats.

Thanks in advance for all the great advice!

Sep 25, 2006 | 11:22 PM

z06inVB

Team Owner

Joined: Aug 2006

Posts: 24,680

Likes: 1,180

From: Raleigh

Cant say myself but this site has helped me trouble shoot a few codes already

http://www.gearchatter.com/viewtopic10305.php

Sep 26, 2006 | 09:10 AM

98C5RT

Thread Starter

Burning Brakes

Joined: Jul 2005

Posts: 998

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From: Somewhere between the Red and the Rio Republic of Texas

Thanks Russ.

Sep 27, 2006 | 07:55 AM

foremaw

Safety Car

Joined: May 2006

Posts: 4,289

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From: Providence Forge, VA

St. Jude Donor '08-'09-'10-'11-'12

Check your battery.

Sep 27, 2006 | 11:55 AM

timemender

Burning Brakes

Joined: Aug 2006

Posts: 1,217

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From: Stark County Ohio

Quote:

Originally Posted by z06inVB

Cant say myself but this site has helped me trouble shoot a few codes already

http://www.gearchatter.com/viewtopic10305.php

Great Site

Sep 27, 2006 | 12:51 PM

fixvet

Melting Slicks

Joined: Apr 2002

Posts: 2,631

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From: Clever, MO aka SOMO

Quote:

Originally Posted by 98C5RT

In 4/04 I had my used '98 coupe about 2 months w/ only 20k miles on it when this happened to me sitting in a left turn lane. Needless to say, that was the longest turn of my life...at a virtual crawl. I finally got off the street and turned off the engine and waited about 3 min., then restarted....... with no bells or whistles flashing....and drove home and started researching here on the forum. I could never pin point just what caused this, but spent $200 on a new TAC module from Ken Fichtner Chevy. I waited to see if this event would happen again but it never has after 2 years and another 20k miles of all types of driving. I never did install the new module, but keep in the rear compartment of my coupe with some tools just in case. I've read about all types of probable causes, i.e. loose connections on the TB to loose connections on a ABS sensor on a wheel. I just live with it now, and try not to worry about. If it happens, it happens I guess. Weird? Yeah, I know.

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