will a ecm out of a early 99 cavalier z24 with the egr work in a 2000 without the egr

No... you cannot swap PCMs without swapping a bunch of other stuff...

i found a 2000 ecm for 25 bucks at a junkyard will i just be able to put this in and do the relearn and eveything will be fine

No 99 z24 had EGR.

A 00-02 ecm will work on a 00. You'll have to do the relearn, and need to be an auto if auto or manual if manual. For plug-n-play...

99 PCMs can be reprogrammed to 00-02 though. They are the same PCM with completely different tunes




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

my car is a 2000 with a auto and the car i found one in was a alero 2000 alero with a auto so it should be fine thanks

no!!!!! they are different a J-body and an alero programing is different!



PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

really dam

I was able to run an Auto PCM from a 2000 Z24 in my 2000 Z24 Manual... i just turned the auto codes off. However, you cannot do that the other way around... a Manual PCM will not work in an Auto.... Just keep looking on ebay,... i found my 2000 PCM for like 30 bucks... Plugged it in, put my stock injectors in, did the theft lock procedure, started the car, performed the crank reteach procedure, and the car ran... then i put my LSJ injectors back in and reloaded my tune on to it... Its been over a year without an issue.

i went in their yard myself and found one out of 2001 z24 with a auto so problem solved thanks for the info tho guys this site has taught me alot thanks again

ok now another problem i got the new ecm out of the 2001 and put it in and did the relearn the first time the theft light turned off i turned the key back to off and wait 15 seconds and the car started so i thought ok its done went out yesterday and it wouldnt start so i did it all over again and it started is this gona be a problem again or am i doing something wrong

You need to do it three complete times and EXACTLY like the procedure says. It is probably only partially doing the relearn.




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

since it starts after the first time do i just turn the key to the on position the second round and not try and start it

this is how ive been doing it and in step 2 it says attempt to start but after the first time i go threw this it starts

. Turn ON the igniton, with the engine OFF.

2. Attempt to start the engine, then release the key to ON (vehicle will not start).

3. Observe the SECURITY telltale, it will be flashing. After approximately 10 minutes the telltale will turn OFF.

4. Turn OFF the ignition, and wait 5 seconds.

5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the PASSlock Sensor Data Code and/or passwords, on the next ignition switch transition from OFF to CRANK.

IMPORTANT: The vehicle learns the PASSlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You MUST turn the ignition OFF before attempting to start the vehicle.

6. Start the engine. The vehicle has now learned the PASSlock Sensor Data Code and/or password.

7. With a scan tool, clear any DTCs if needed. History DTCs will clear themselves after 100 ignition cycles

It shouldn't start till the forth try.....




PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

it does after the first wonder why

Mine did after the first, and has ran ever since

Little late to the party but I did the relearn 3 times without attempting to start the car and its been fine.

Turn the key to the on position but not far enough to engage the starter each time.


"Oil Leak ? What oil Leak ? Oh, Thats Just The Sweat From All The HorsePower!!"

put the ecm in and had car running never thought to put it in gear (this is a dirt track racecar) went to load it saturday and when i put the car in gear it quits tried 3 times is this one out of a manual car then im kicking myself bc i didnt even look inside the car just seen a z24 and grabbed it

just thought i would say i did a five speed swap on my 1998 and used a 2000 so i dont have my egr plugged in and it dosnt throw a singe code it works for me.