My harmonic balancer came apart so during the course of replacing it, I decided to degrease and pressure wash the bottom of the car and the bottom of the engine, suspension etc. I put the car back together and now I have an ABS Light and a Trac Loc Light. I hooked up my ABS Code reader and it tells me I have Codes C1243 - BPMV Pump Motor Stalled and a C 1281 - Active Handling Sensors Uncorrelated. I started through the troubleshooting chart in the manual, checked the ground at the plug behind the left headlight like the book said and it was within limits. The next thing I tried was taking the module off to see if it had water inside causing the problem. I pushed it up and out of the bracket and removed the 4 screws. I couldn't get the module to separate. I tried getting under it with a screwdriver and a gasket scraper to try to pry them apart. It wouldn't budge. I hit it pretty hard but I was afraid I was missing something so I quit and put it back together. From what I've been told and what I've read on here, I just didn't hit it hard enough. Anyway, before I beat the hell out of this thing I thought I'd come in here and see if anybody's had a similar problem. I have to think the issue was caused by the pressure washer because everything was just fine prior to the balancer being replaced and the pressure wash.

 

On my 2002 there are six screws holding the ABS computer module to the pumper unit. The two at the bottom are not easily seen.

 

I'm pretty sure mine only has 4 but I'll look again. It actually rotated enough that I couldn't get the screws back in until I rotated it back.

 

If it looks like this it has 6 screws, and actually its the 2 middle ones that are hard to get ...hope this pic helps ya good luck

 

Thanks. I still have the car on the rack and I'm off work tomorrow so I'll give it another look. As I reacall mine didn't look just like that but it's been a couple days and my photographic memory isn't what it used to be. I hope it's something that simple. It's hard to believe that everything was just fine until I changed the balancer and pressure washed the bottom of the car. Doesn't Chevrolet expect the bottom of the car to get wet ? I've gone over it several times hoping to find a wire off or something stupid like that.

 

What you really want is someone with a Tech2, to do an automated bleed process. This might get the BMPV motor restarted.

 

I really don't think this is a bleeding issue. I think it was pretty much self inflicted. Had I not been a clean freak and pressure washed the whole bottom of the car, I doubt I'd have an issue. I didn't get the lights until I pulled the steering rack to replace the harmonic balancer and pressure washed the underside of the car. I now have a C1243 and a C1281 DTC. Today I cleaned the grounding plug and cleaned up the connection. It had a lot of crap in it. Hopefully the code will go away after 50 starts but I'm not optimistic. MY ABS tester doesn't reset the ABS code so I just have to wait and see.

 

You don't need your ABS tester, use the DIC to read and reset the codes.

http://www.c5forum.com/ayc/dtcdic.php

 

 

You have a stalled pump code, the Tech2 can turn it on and test it.

Read up on automated bleed procedure. Also make sure your contacts to the EBCM are clean. It's a water proof connector, but I would check it just in case.

BTW, you ABS reader probably won't work on the corvette. You need a Tech2 to work, read and diagnose problems. Elsewise you're just guessing.

The DTC provides code information on what the general problem is but you then need to diagnose the problem. as it could be something as simple as a fuse, or worse case, a bad ECBM or ABS pump.

Looks like you're also getting steering code snsor which is located inside the car at the base of the steering column.

I suggest you get some GM manuals about how to fix the problems you're having along with using the forum.