A few posts ago I stated my C/E light would come on steady after about 10min of driving. The code was QDM 640 which is Quad Driver Module which I was told was in the PCM. I purchased a reman ECC from CARDONE and put it in. 10min later C/E light again. I had code re-read today and he told me now I have 2 QDM codes coming up. Question #1: is the PCM/ECM/ECC all the same thing and go behind the glove compartment. Question #2: I had to take the old chip and put it in the newer unit. Does QDM have anything to do with the chip. Question#3: How do I have 2 QDM readings now?

That'* a good one. jrs3800 is the resident quad module expert. I'd be really tempted to replace the chip. The ECM/PCM/ECC is the same thing. It'* called a PCM in the boneville, cuz it controls the whole powertrain, including trans. Powertrain Control Module.

Approaching this analytically.....

You had one code. You replaced the PCM, but not the chip. You still have a code. I'd say one of the inputs from the chip isn't correct, and the quad driver module is confused, and won't operate. There aren't really any external components that feed info back to the quad or PCM that wouldn't thow their own unique code, so it'* fairly safe to say the problem lies in the PCM or chip.

A new PCM isn't a gaurantee of a 'good' part. Bad ones have been built before, but the other variable that hasn't been changed is the chip. I'd try that first.

OK. How much do the chips go for. I know Herrs & Ruffles are about $2 per bag. Any chance I'll get a PCM chip in that price range cause I'm tired of spending $$$.

I couldn't tell you. Jr changed his on his 95 awhile back. If he still has the 8-digit part number, we can run it through gmpartsdirect and get a price. Otherwise, you'll need the number from the dealer. Don't freak at the dealer price. Much cheaper on the www.

Damn, that'* cheaper than I expected. I'd bet that chip would be $35 at www.gmpartsdirect.com so let'* see.... $29.82!

Get the right part number from Deathrat or the dealer, and get one. At that price, I'm tempted to buy a spare. That can be a 'fix it right now' type of failure.

ok. Just called dealership. I need to give him codes off the existing eprom to pinpoint xact part. He has 2 options part#16204422 & part#16201388 both are $60.84. Hmmm do I have time to take out ecm now b4 work becaue I'm really anxious now?

I just pulled out PCM and opened it for part# on OEM chip. The top says BKKH 1389 then there is a code on the side of chip that says 72444 9423. The actual reman PCM housing has part#16201364 on it. The dealer only gave me 2 options for a part# as you'll see in my post. Where do I stand now? Im stuck.

Phone back to that GM Dealer and give him the code off your Chip! (BKKH 1389) From this, they should be able to tell you exactly what chip is needed for your vehicle.

Talked to dealer agian. Seems that the proper part# will be the 162011388. It was $61 so I want to gmpartsdirect.com orderd it for $30 plus *&h. Thanx guys I'll update u after I put it in to see if it fixes the c/e light prob.