98 computer replacement

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Albert

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I need a new ecm can I use a ecm from a 99 tahoe or do I need a ecm for the same exact year? Of not where have you guys purchased your ecm?
 

east302

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Not sure if it helps, but comparing the part numbers on RockAuto for Delco for a 1998 C1500 vs a Tahoe (both with 350), the numbers are the same. I'm sure there is some reprogramming involved.

Maybe someone else could confirm.


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Albert

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Yea the shop that I had them take a look at the truck my original issue was the a.c. compressor was non stop running an pin 1 dark green wire wasn't getting any voltage. The owner of the shop is parting out a 99 tahoe an was going to try to swap ecm out to see if that works
 

Supercharged111

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You can try for fun, but you'll have VATS issues if you don't have someone flash it. 98-00 all used the later computer. 2wd and 4wd matters as does factory tire size and gears between the 2.
 

df2x4

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Pretty sure I mentioned this in your other thread... But like others have said you're going to need a tune unless the PCM you swap in came from a pretty much identical truck. Even with a tune, if your truck is pre-'98 you're still going to need a PCM from a pre-'98 truck because of the PassLock issues. Even though yours is a '98 and the Tahoe is a '99, you'll probably still need a tune to overcome the anti-theft problems.

That's why I suggested buying a performance tune from someone like Black Bear Performance and paying the core charge for a spare PCM from them. Your only other options that I can think of would be to swap in a PCM from an identical truck (engine, trans, gearing, year, etc.) and pray it works, or buy a used one and have a dealer flash a stock tune for your truck to it based on the VIN. Never done the latter, but I'd imagine the amount of money involved would be similar to buying a performance tune. At that point, I'd just buy a tune from Black Bear and enjoy the additional benefits.
 

jaywestfall

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Just had one put in my 1998 Chevy C1500 2wd ext cab auto with 350. Part number 9366810. I bought it at gmpartsdirect.com, and they charged $223.57 plus $200 for the core on top of the part. Cost me $150 to get it installed and programmed.
 

Albert

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Pretty sure I mentioned this in your other thread... But like others have said you're going to need a tune unless the PCM you swap in came from a pretty much identical truck. Even with a tune, if your truck is pre-'98 you're still going to need a PCM from a pre-'98 truck because of the PassLock issues. Even though yours is a '98 and the Tahoe is a '99, you'll probably still need a tune to overcome the anti-theft problems.

That's why I suggested buying a performance tune from someone like Black Bear Performance and paying the core charge for a spare PCM from them. Your only other options that I can think of would be to swap in a PCM from an identical truck (engine, trans, gearing, year, etc.) and pray it works, or buy a used one and have a dealer flash a stock tune for your truck to it based on the VIN. Never done the latter, but I'd imagine the amount of money involved would be similar to buying a performance tune. At that point, I'd just buy a tune from Black Bear and enjoy the additional benefits.

I tried contacting black bear performance to try to get a little bit more information as well as pricing but haven't received an email it's been a few days.
 
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