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94/95s are weird with the check engine light.

I've got a group of codes that will sometimes set the light but other times will not.

check engine light went away on friday and has not came back on at all.

it was on for about 150 miles after i changed the pcm. and has been gone for 4 days now,

so im assuming all i had to do was drivethe car a certain amount of miles to reset the computer.

hopefully the light stays off cause i really dont have $100 just to scan the car for codes.


thanks for your help guys.

Advance scans for free.. I'm assuming you know that and they don't have the right scanner?

Yeah if you ever get the chance, have the car scanned, even if the light is off now. Your history codes will tell you what WAS the issue and that may be good to note down if there ever is a future issue.

advance cant scan my car. its obd 1.5

and i would love to get it scanned, but cant afford to just pay $100 that every shop wants just to do a scan.

i paid almost $250 for this *dang* brand new code scanner actron cp9110 with gm cartridge and 2 slug made cables and it never worked on my bonneville.

it worked on every other car i used it on, just not my 95 sle.


so ill be posting my actron scanner for sale in the sale section just so i can pay $100 and get my car scanned. thats some b.s

IMHO the likely culprit would be the 5k watt system. You would need well over 400 amps to compensate for the draw. The batteries are irrelavent when you half the amps needed at best. I dont think anyone can build a CS alternator capable of that. With the way subs draw based upon well uhh bass, lol, you are going to have many voltage spikes every second they are on. That cannot be good for a pcm.

Are the subs still in there?

Rather strange, I know I've had Advance scan my car for me before. I do it at my shop normally though, he has a $10k SnapOn that does it all. You may want to call around, scanning should be free, not pay-for...someone is just trying to take advantage of you due to your situation and that's just not fair.

ChilinMichael wrote:Rather strange, I know I've had Advance scan my car for me before. I do it at my shop normally though, he has a $10k SnapOn that does it all. You may want to call around, scanning should be free, not pay-for...someone is just trying to take advantage of you due to your situation and that's just not fair.

Shops wants a diag fee, and they are gonna charge you an hour labor. Just how it is. We never scanned a car for free.

01bonneSC wrote:

ChilinMichael wrote:Rather strange, I know I've had Advance scan my car for me before. I do it at my shop normally though, he has a $10k SnapOn that does it all. You may want to call around, scanning should be free, not pay-for...someone is just trying to take advantage of you due to your situation and that's just not fair.

Shops wants a diag fee, and they are gonna charge you an hour labor. Just how it is. We never scanned a car for free.

Ya might want to try and scare up an old Actron 9145 with the OBD II cable. I have no idea why they still sell for around $100, they must be of value for other manufacturers. For '96+, they are pretty worthless. You get DTC codes and about 15 operating values. It doesn't even give you volts. If you have a boost gauge that sucks.

For the '95 though, it gives you just about every operating value you could possibly want. Everything but ABS. My '95 is alive and well today at 215K because i always knew about any impending problems ahead of time. The only thing that ever stuck me, was a sudden crap-out of the starter.

On the PCM, it is what it is. I'm on my third in my '95. And I have another on the shelf in the garage ready to go. The most money and time I ever wasted on any of the 3 cars, was a camshaft sensor DTC. I cleaned/replaced (luckily I have a great boneyard) everything in that ignition circuit. Then I bit the bag under another '95er urging and spent the $30 for another PCM. It fixed it. I got another code one time, and it didn't make any sense, again replacing fixed it.

I have replaced everything in the PCM circuit, from the relay out, over the years just for the heck of it. The second one went goofy after I had most of it done.

Another thing, if you go to the old posts from 6 yrs ago or so, you may notice that there was a large number of '95 people who had a problem that we couldn't solve, then disappeared. maybe they just dropped out of Bonnevilleism. I'll bet the '95 PCM was just a patch job carry-over, until they came out with a completely newly engineered one in '96. IMHO.

Anybody's GrandDad has a low miles '95, I'm interested. The '96's TCC slips are getting high, and I want to send it on its way. I don't have the time and equipment to drop a trans in the driveway.