i got a new ecu fo the junkyard today from the same year blazer.
would i have to do anything to it or can i just put it in and drive it

 

First of all, why are you replacing the ECU?! What's wrong with the one that's in there now?

You're "supposed" to get the EEPROM erased and re-programmed by a GM dealership, but I think you can plug it in and give it a shot if it came out of the same vehicle you have. Worst case (assuming it's good!), the security system may freak out and shutdown the engine. I don't think 2000 has the programmed ignition keys, but I'm not 100% certain.

 

Yeah, I'm not an expert on this but I think the only thing you might have to worry about would be like Helo said and the security system freaking out. But as mentioned, I don't think they had the programmed keys in 2000. So I would probably say give it a shot and see what happens.

 

no 2000 does not have a chip key setup (resistor chip on the key)

 

ok thanks and does he ecu have anything to do with the transmission

 

You might want to start looking at swapping your transmission instead of your ECU... see what kind of deal you can get from your junkyard. Hell, they might even do the swap for a small fee.

The ECU deals with just about everything, but that doesn't mean it's the root of your issue(s).

I'd bet your ecu isn't the problem according to your other thread. You said you may have gotten a significant volume of water in your tranny... ? The ECU is a fairly resilient watertight box... you'd have bigger problems if it was fried.


https://blazerforum.com/forum/2nd-generation-s-series-1995-2005-tech-41/blazer-got-wet-now-isnt-shifting-right-i-need-help-please-47252/
ok i got a 2000 blazer 4 wheel drive 4 door i went through a creek and got stuck the car died so i had to get pulled out in nutral but the ar was in 4 lo got it out and got it running but the tccm (transfer case control module) got wet so it was stuck in four lo so i went to the junk yard and got a tccm and got it out of four lo and when back in 2wd drove down the rode and it would only shift into first and second gear is there a transmission control modual that could of got wet or anyhting i could really use the help thanks

 

ok so i drove it up to get the codes ran and it came up with cylinder 6 misfire and throttle position sensor so i went up to the junk yard and put a sensor in and the trans is shifting fine but the service engin light was on n the codes read the same thing any idea that could cause that?

 

*Thread Closed* - Please do not double post your questions.