Is Your Cadillac or GM SUV Acting Possessed?
You get in your 2008-2009 STS, CTS, or maybe your family’s Acadia, turn the key, and… nothing. Or maybe it cranks but won’t start. When it does run, it shifts hard, the check engine light is a permanent fixture on your dash, and it feels like it’s lost all its power. These aren’t just random annoyances; they’re classic signs that the brain of your vehicle—the Engine Control Module (ECM)—is failing.
Over my two decades turning wrenches, I’ve seen how heat and vibration, especially in the engine bay where these modules live, take their toll. The delicate internal circuits and processors that manage everything from your fuel injectors to your spark timing begin to break down. This leads to a cascade of problems that can be incredibly frustrating and difficult to diagnose without swapping parts.
A Hands-On Diagnosis: The Case of the Confused Crossover
“A customer’s 2009 GMC Acadia came in last week with these exact symptoms. The owner was at his wit’s end. He’d replaced sensors and chased wiring ghosts for weeks. The vehicle would randomly refuse to start, and when it did, the transmission would slam into gear. The scanner was lit up with a bizarre mix of communication and sensor codes. We connected our diagnostic equipment and saw that the ECM was intermittently dropping offline. After confirming power and ground to the module were solid, we knew the ECM itself was the culprit. The constant heat exposure from its location right behind the fan shroud had cooked the internal components. A new, properly programmed module was the only correct fix.”
The Guaranteed Fix: A Plug-and-Play Solution
Don’t waste time and money on guesswork or expensive dealership visits. This Engine Control Module is the direct, reliable solution to restore your vehicle’s performance and sanity. The biggest hurdle with replacing an ECM has always been the expensive programming required *after* installation. We eliminate that problem entirely.
We professionally flash this module with the latest, most stable GM-certified software specifically for your vehicle. All we need is your 17-digit Vehicle Identification Number (VIN) during checkout. When the part arrives at your door, it’s ready for a straightforward installation. No extra tools, no trips to the dealer, no surprise programming fees.
What This VIN-Programmed ECM Corrects:
- ✔ No-start or intermittent starting conditions
- ✔ Check Engine Light (CEL) illumination with various DTCs
- ✔ Poor or erratic engine performance and low power
- ✔ Harsh or incorrect transmission shifting
- ✔ Communication issues with other vehicle modules
- ✔ Decreased fuel economy
Compatibility and Part Numbers
This module is a direct replacement for several original equipment part numbers. If your old module has any of the following numbers on it, this part is the correct fit for you:
- ✔ 12623325
- ✔ 12628387
- ✔ 12605672
- ✔ 12630594
- ✔ 19300016
Our ECM is guaranteed to be compatible with the following vehicles, provided the engine and options match:
- ✔ 2008 Cadillac CTS: Electronic Control Module; (RH front engine compartment), (3.6L), VIN V (8th digit)
- ✔ 2009 Cadillac CTS: Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
- ✔ 2008 Cadillac STS: Electronic Control Module; (RH engine), 3.6L
- ✔ 2009 Cadillac STS: Electronic Control Module; (RH engine), (3.6L)
- ✔ 2009 GMC Acadia: Electronic Control Module; (behind fan shroud)
- ✔ 2009 Chevrolet Traverse: Electronic Control Module; (behind fan shroud)
- ✔ 2009 Saturn Outlook: Electronic Control Module; (behind fan shroud)
- ✔ 2009 Buick Enclave: Electronic Control Module; (behind fan shroud)
IMPORTANT: After installation, your vehicle may require a security relearn procedure (often called a Passlock or anti-theft relearn), which is a simple process that can be done without any special tools. We include easy-to-follow instructions for this. Get your vehicle running right again with a solution you can trust.