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Username Post: 92 GMC K2500 ECM/MEMCAL HELP ASAP!        (Topic#343989)
Forum Newbie
Posts: 2
Age: 38
Loc: Haughton, Louisiana
Reg: 04-12-17
04-12-17 02:01 PM - Post#2686272    

I Have a 1992 GMC K2500 with a 350 with a standard transmission. The ECM shorted out and caused the MEMCAL chip to melt. I already bought an ECM, and was able to salvage the PROM chip (the bigger of the 2 chips). All I need is the small chip but GM discontinued them. Some people tell me to get one from a junkyard & have it flashed, others say I'm SOL unless I come across someone who has the exact one I need. Can anyone PLEASE help? All info is below:

ECM Service #: 1228747
PROM (bigger) Chip: AWSY
MEMCAL Chip: 16157604


Edited by GMCBaby1992 on 04-12-17 02:01 PM. Reason for edit: No reason given.


"7th Year" Silver Supporting Member
Posts: 3970
Loc: Salt Lake City
Reg: 06-20-09
04-12-17 06:50 PM - Post#2686318    
    In response to GMCBaby1992

Fortunately, they're pretty standard across the years.

The thing to do is find one from any truck 88-95 that is the same engine and manual transmission. It will plug right in and you'll be fine. Now, finding one may be the hard part. No flash programming needed.

I may have access to one here in Utah.


'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke

Very Senior Member
Posts: 4031

Reg: 12-29-02
04-12-17 09:43 PM - Post#2686362    
    In response to GMCBaby1992

GM called that a CALPAK. You might have more luck searching for it using that name or possibly the slang NETRES name. It is definitely not a MEMCAL because the MEMCAL was both the PROM and CALPAK built into one module which were used in the PCM's that came after the one you're looking at.

It's not a flash chip so it doesn't need any programming. It's just a network of resistors actually.

If you can find one from the same ECM service number which ran any size of V8 then it will work for you. The important part is keeping it matched to a V6 or V8. It's used for the limp home mode so it's really not important to find that exact same one.

One from a different ECM service number might work too, like from a 1227747 or 1227746 ECM. I've never tried it and have never read about anyone else trying it either. But, considering how simple it is, GM might have kept the module pin-out the same through the different ECM's that used it.


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