You already bought the donor
Send both
$149Everything included
Ship your original and the module you already have. We copy everything across, bench-verify it and send both units back.
Call to startUsed and junkyard modulesWill a junkyard ECM work?
Almost never on its own — and the reason catches most people out. The part isn't broken. Your car's anti-theft system doesn't recognize it, because the key data lives inside the computer and it's still locked to the car it came out of.
Read us the part number off the sticker and we'll tell you in about a minute whether your module can be cloned.
What actually happens
It starts. Then it dies. Then it stops trying.
This happens with almost every used computer that isn’t a match. Nothing is actually broken — no misfire, no bad ground, no fuel problem. It’s the anti-theft system doing its job.
You turn the key. Here’s what happens — every single time.
- 2 secEngine starts, then quits
- 2 secEngine starts, then quits
- 2 secEngine starts, then quits
- 2 secEngine starts, then quits
- 2 secEngine starts, then quits
- Locked outNow it won’t even crank
Typical behavior · the exact number of tries varies by vehicle
Why
The anti-theft key lives inside the computer
When you turn the key or press the button, a chip in the key sends an ID. The engine computer checks that ID against the list of keys it has stored. If it matches, the computer keeps the engine running. If it doesn't, it cuts fuel or spark a second or two later.
A module out of a donor car is carrying that car's list of keys, not yours. Your key is a stranger to it. The engine fires because fuel and spark work fine for a moment, then the immobilizer catches up and shuts it down.
That is why the symptom is so specific, and so misleading. Nothing is faulty. The two computers simply do not agree about who owns the car.
Your VIN and calibration are in there too
Alongside the key data, the module stores your VIN and the calibration for your exact engine, transmission and options. A donor from a different build carries different settings, which is why even a mismatched module that does start can throw codes, shift wrong or fail emissions.
The check that happens every time you start it
Your key sends
4A 7F 12 9C
Donor computer knows
- B2 1D 09 44
- C4 E7 A1 30
Your key is not on its list. Fuel cut after two seconds.
Be honest about it
When a used one does work
Plenty of older vehicles have no immobilizer at all. If yours is one of them, a straight swap can genuinely work and you don't need us.
A plain swap can work
- Older vehicles built before immobilizers were standard — roughly mid-nineties and earlier, depending on the make
- Some modules that were never married to a VIN in the first place
- Cases where a shop can still re-learn your keys to the donor module with a scan tool
A plain swap will not work
- Anything with a factory immobilizer, which is effectively every mainstream vehicle from the mid-2000s on
- Modules that leave the factory locked — Chrysler, Dodge, Jeep and Ram GPEC2, and GM 2014 and newer
- Any case where the donor's part number doesn't match yours
Not sure which side of the line your vehicle falls on? Read us the part number off the sticker and we'll tell you straight — including when you don't need us.
Call (404) 666-8211The part number
“Close enough” is not close enough
The number printed on the sticker is the whole game. It identifies the hardware — the board, the processor, the connectors. A donor has to carry the same part number as yours, not a similar one, not the one the parts site says supersedes it.
Letters at the end of the number usually mark the software level, and those can differ, because the software is what gets replaced anyway. The rest cannot.
A donor built close in date to yours is better than one years apart, even with a matching number. Hardware revisions happen quietly within the same part number.
Where the sticker is
On most cars and trucks it is on the computer itself, usually on the driver's side of the engine bay near the battery or the firewall. If you can see the module, you can photograph the sticker. Text the photo to (404) 666-8211 and we'll read it for you. More on finding the number →
A real part number, split in two
68153864AH
- The number has to match. This is the hardware — the board, the processor, the connectors.
- The letters can differ. They mark the software level, and the software is what we replace anyway.
The fix
You already own the thing that makes it work
The used module isn't wasted. Your data is what's missing, and your original still has it.
We copy your VIN, your key and anti-theft data, and your calibration onto the donor. It comes back plug-and-play, your existing keys still work, and there's no dealer visit.
Even if your original is completely dead we can usually still read the memory chip directly and build the twin from that. If it can't be read, we tell you before anything else happens.
You couldn't find one
We find the twin
$299Module included
Ship only your original. We source the part-number-matched donor, clone it and send both back. For common families we usually have one in 2 to 5 days.
Call to startBefore you give up on it
Questions people ask us
I already bought the used one. Is my money gone?
No. A part-number-matched donor is exactly what we need. That module becomes your twin — the $149 path exists for people in precisely your position.
Can't the dealer just program it?
Usually they will not program a used module at all, and will quote you a new one plus programming instead. That is the quote most people are holding when they call us.
Will I need new keys?
No. Your key and anti-theft data get copied across, so the keys in your pocket keep working. No re-cutting, no re-learning, no dealer visit.
Does the donor have to be the same year?
The part number matters more than the year. A donor close in date is better, because hardware revisions happen quietly inside the same part number, but the number itself is what has to match.
What if the junkyard module is also bad?
We bench-verify on a simulator before anything ships, so you find out here rather than in your driveway. If the donor is dead we tell you and go over the options with you.
Is any of this legal?
Yes. You are restoring your own vehicle's data onto a replacement part for your own car, which is why we ask for the VIN and proof the vehicle is yours before we start.
One number ends the guessing
Read us the sticker.
We'll tell you whether your module can be cloned, what it costs, and when you'd get it back. If a plain swap would have worked, we'll tell you that too.