So, I had Skull-1 scanned by some idiots, and this is what they came up with:
86 abs/tcs turned on red warning lamp
51 rear axel nut failure (motor free spins)
They did not tell me exactly what it meant because it was a free scan. I searched the interweb and found the 51 code means something is physically wrong with the ABS motor pack. The 86 code I have no idea what it is. My 3rd brake light is out, but I replaced it but to no avail.
So what can I do about these? Is the ABS module easily fixable? Is there something else I should look for as far as the light issue? This is the problem that lead to this

 

Is the "BRAKE" light on, on the dash? In my code listing, that's what 86 means..... the EBTCM turned on the red "BRAKE" warning light. Is it possible you have run low on fluid, or have a leak in the rear braking circuit?

 

Ah yes, I forgot to mention both the red BRAKE and orange ABS lights are on. The fluid appears to be where it should, I don't know how I would check the rear braking circuit though.

 

The "BRAKE" light is turned on to indicate a difference in pressure between the front and rear systems. But, that pressure difference may also be due to the ABS rear motor problem.

 

So do ya think it would be a "simple" replacing of the ABS motor?

 

It would probably be a fairly expensive replacement, if it doesn't fix the problem. Might almost be worth letting a brake shop look at it, rather than going the parts replacement route.

 

Subject: Abs light on - dtc's 46 and 86 set (perform diagnostic procedure, replace center abs motor pinion)

models: 1991-97 buick skylark 1992-97 buick regal 1994-97 buick century 1992-96 chevrolet beretta, corsica, lumina apv 1992-97 chevrolet cavalier, lumina, 1993-97 chevrolet camaro 1995-97 chevrolet monte carlo 1997 chevrolet malibu, venture 1993-97 geo prizm 1995-97 geo metro 1996-97 geo tracker 1991 oldsmobile calais 1992-96 oldsmobile cutlass ciera 1992-97 oldsmobile achieva, cutlass supreme, silhouette 1997 oldsmobile cutlass 1998 oldsmobile intrigue 1991-97 pontiac grand am 1992-94 pontiac sunbird 1992-97 pontiac grand prix, trans sport 1993-97 pontiac firebird, trans am 1995-97 pontiac sunfire

condition:

Some owners may comment that the abs light is on with diagnostic trouble codes (dtc's) 46 and 86 set (rear abs channel will not move) as current or history. (dtc's 46 and 86 will be displayed as c1246 and c1286 on 1997 and 1998 model year vehicles).
Cause:

A condition exists where the abs motor pack gear (pinion) will bind on the motor armature shaft causing the motor not to move when commanded by the ebcm. This condition is aggravated by light corrosion between the pinion and shaft. Therefore, it may occur more frequently when the weather is hot and humid.
Important:

Other ebcm and abs motor pack concerns can also cause this condition, but they are not as common as the above cause.
Correction:

Follow the attached procedure (attachments 1 and 2) for diagnosis. This condition may correct itself before the owner is able to bring the vehicle in for service. Therefore, if dtc 46 is set in history, and is not currently setting, the attached procedure will instruct you to replace the center abs motor pinion. The new pinion has a teflon insert which reduces friction between the pinion and motor armature shaft.
Pinion replacement:

If the attached procedure instructs you to replace the center abs motor pinion, use p/n 18029776. Please note that the new pinion is a direct replacement part which requires no modifications to the motor shaft. Follow the pinion replacement procedure included with the new pinion. Complete motor pack replacement is not required.
Parts information:

Parts are expected to be available july 30, 1997.

 

I wanted to reply more but my all data went down. It stated if both codes are present that you need to correct the 51 code before you move on to the 86 code. It stated that the one code will trigger the other. Will try to post trouble tree for you to follow tomorrow when i get to the shop.