: Used ECM/ECU - reset needed?

04-02-13, 04:30 AM

I have a SRX 2005 3.6 AWD with a faulty ECU (item: 12592124) according to GM technician, who did extensive tests of all possible errors.

The technician is offering a new GM ECU for a lot of money. However I can buy a used one but there is one issue:

The replacement ECU needs to be reprogrammed after installation by a GM specialist, but does it require reset/zeroing (during removal from old owner car) before it can be used in my car? Or can the ECU be reprogrammed irrespective of its prior state?

Im living in Sweden so refurbished/third party ECM:s are not available here, so my only "quick" option is to buy this used ECU, that was just pulled out from another SRX and put out for sale.


04-02-13, 09:45 AM
Yes you have to remember your oil life and program the used ecm to your car

04-02-13, 11:07 AM
ok. thx! Good tip!

But do the seller of the replacement ecm need any software to "zero"/reset it before it is removed from donar car?

some ecu need this I have been told.


04-02-13, 11:37 AM
Been told wrong, no reset before removal needed.

04-02-13, 12:59 PM
If I am not mistaken, if you get a used ecm and want to put it on your car and remove your old one, then you needto go to GM and program the replaced ecm or take a chance it learns, am I wrong Glake99?

04-02-13, 01:31 PM
As far as I know like most boxes in the car that are connected to the network they need to have the current VIN flashed into them, it wont "learn" the VIN unless the Tech2 tells it.

04-02-13, 01:47 PM
Oooooh, I've been promoted to 99. ^ Cone is right.

04-02-13, 02:00 PM
So close to 100, keep trying! lol

04-02-13, 04:58 PM
Actually, in my scheme of things, it would be 00.

04-03-13, 02:35 AM

04-05-13, 01:47 AM
When I replaced the ECM in my 03 Envoy with a used one bought from a salvage yard, my vehicle's VIN had to be programmed into the used one. Also I had to go thru a security procedure of 3 cycles of turning the ignition on, letting the unit vehicle set for 10 minutes, turn off ignition and back on, let set 10 mins. On the last cycle the vehicle would start. Also the replacement ECM may need a CASE relearn. Crankshaft angle sensor error... I think. This is a correction stored in the ECM to correct between actual top dead center and what's sensed. This takes a higher end scanner such as the Tech 2 or some of the commercial gauges like the Dashhawk can do it. I don't know if all this is required for the ECM used by the SRX but would assume some of the steps would be needed.

04-06-13, 08:16 PM
Just replaced my ECM/ECU in another car. Had to be reprogrammed. There are specialists that work with the non-dealer (gas station mechanics) that will reflash them. They needed both keys (for my car) and it worked well. Cost was $250.