Fault Codes - TCM-0094, TCM-0099, ECM-4801, ECM-4901

[02executives80guy]

Hey everyone,

Took my 2002 S80 T6 to the Volvo dealership for a free read of the Check Engine light(part of their Service for Life service with provides for the dealership to read your codes for free, thank goodness! )

I was provided report a stating the following:
TCM-0094 Communication Control Module - Signal Missing(Active Fault)
TCM-0099 Control Module Internal Fault
ECM-4801, ECM-4901 Three Way Catalytic Converter Faults (Active Faults)

The notes from the mechanic state that due to the TCM fault codes, possible internal failure in transmission - recommend full diagnosis be performed to confirm. I know for a fact that this car has had some transmission work done on it, specifically the shift module has been replaced. The car runs fine, so I'm not to concerned about that failure. But I did take it on a recent trip to Los Angeles and while going over The Grapevine, the Service Transmission Required message appeared. I figured that just meant I needed to change the Transmission Oil and Filter(if it has one) .Any advice?

Also the mechanic notes state that there is possible three way catalytic converter damage. I'm assuming that means I need to replace the Catalytic Converter.

I've looked online and found that the ECM-4801 and ECM-4901 indicate that I potentially need new injectors, a catalytic converter, or new O2 sensors. Any advice?

Also, anybody have a good source on repair material? I'm very comfortable around a car, but never worked on a Volvo. I have other things I need to take care of that would be useful to have information on "how-to", specifically:

• Repair interior of passenger door divide
  Replace upper motor mount
  Check other motor mounts

Any help would be greatly appreciated. Car has about 92000 miles and drives around Northern California on most days.

[02executives80guy]

WOW 30 views and no replies. Does that mean I need to sell this car!

[02executives80guy]

Just an update, I've found on here the directions on how to replace the motor mount for a 2000 S80, whew!

Actually, a lot of great information form this article:
https://www.matthewsvolvosite.com/forums ... 11&t=19683.

I've decided to replace the upper mount with a standard replacement, purchased locally for $45.00 I should have it by tomorrow, so will let you know how it goes.

I don't think any of the other bushings or mounts are bad, but only a ride after installation will tell. I'll keep you updated

I also decided to replace the air filter today, the old one was pretty dirty.

[dcarlson12]

Hello Luis,
Since no one else has chimed in, to work on these cars there are no factory service manuals. What you need to get is a copy of VADIS on CD. It shows 'all' maintenance procedures, parts, etc. including definitions of trouble codes. You should be able to find it on ebay. Normally just a few dollars. The version I have covers from 1999 to 2005 for the S80 and from 1989 for other models.

Here is a link to a site of a company which produces code readers and which has all your code listed.
http://www.ppc-diagnostic.com/codes/

They (BSR) used to produce a nice little code reader which could be used to read the codes, reset the CEL and reset most if not all modules including Airbag trouble code. Unfortunately they no longer make the small reader which sold for a couple hundred US$. They have a new expensive one which covers more cars but seem way too expensive for the average DIYer.

Let us know how you make out.

[02executives80guy]

Thanks dcarlson12.

I had found that ppc-diagnostics site previously, but you highlighting it made me look again

From what I can gather,codes TCM-0094 and TCM-0099, looks like I have an internal fault on TCM and have missed a communication from the gear selector. Doesn't seem like the end of the world if you ask me

Also, codes ECM-4801 and ECM-4901, seem to indicate that bank 1 and bank 2 are faulty, i.e. probably need to just replace the O2 sensors on each tube connecting the turbo chargers to the catalytic converters.

Any disagreement before I go a order these parts?

Thanks