Restore Peak Performance to Your GM Vehicle
Is your 2008-2009 Cadillac CTS, Acadia, or STS suffering from perplexing engine issues? Unexplained stalling, rough idling, a persistent check engine light, or a sudden drop in fuel economy can often be traced back to a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle’s powertrain, responsible for managing everything from fuel injection and ignition timing to emissions controls. When it fails, it can cause a cascade of problems that are frustrating and difficult to diagnose. This genuine GM Engine Control Module, part number 12605672, is the definitive solution to restore your vehicle’s original performance, drivability, and reliability.
We had a 2009 Acadia come in that was driving the owner crazy. It would randomly stall at stoplights and had a check engine light for an intermittent camshaft position sensor. The owner had already replaced the sensor twice at another shop with no luck. After hooking up our scanner and monitoring live data, we noticed the voltage reference from the ECM to the sensor was fluctuating wildly. The sensors were fine; the computer sending them signals was the problem. We installed one of these pre-programmed ECMs, performed a quick crankshaft position relearn, and the vehicle ran perfectly. It saved the customer from throwing more parts at a problem that wasn’t correctly diagnosed, highlighting how a faulty module can mimic other component failures.
Is Your Vehicle Exhibiting These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following issues, a faulty engine computer could be the culprit. This replacement 2008-2009 CTS Engine Module is designed to correct these exact problems.
- ✔ Persistent Check Engine Light (CEL) that won’t clear, or for random, unrelated codes.
- ✔ Engine misfires, stumbling, or hesitation during acceleration.
- ✔ Unexplained decrease in fuel efficiency.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Intermittent stalling or rough idling.
- ✔ Shifting problems with the automatic transmission.
- ✔ Failure to pass state emissions testing.
The Plug-and-Play Solution
What sets this module apart is our professional programming service. Dealerships and many repair shops require you to have the vehicle present to program a new ECM, adding towing costs and labor charges. We eliminate that hassle. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our certified technicians will then flash the unit with the latest, most up-to-date GM-certified software specifically for your car’s configuration. This ensures complete compatibility with all your vehicle’s systems and options right out of the box. No extra trips to the dealer, no expensive programming fees—just a straightforward installation.
Guaranteed Fitment for Your Vehicle
This module, part number 12605672, is a direct replacement for several original equipment part numbers and fits a range of GM vehicles. Please verify your vehicle and options below to ensure compatibility. This is the correct 2008-2009 CTS Engine Module for models with the 3.6L VIN V engine, and it also fits other popular GM SUVs and sedans.
- Cadillac CTS 2008-2009: Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
- Cadillac STS 2008-2009: Electronic Control Module; (RH engine), 3.6L
- GMC Acadia 2009: Electronic Control Module; (behind fan shroud)
- Chevrolet Traverse 2009: Electronic Control Module; (behind fan shroud)
- Saturn Outlook 2009: Electronic Control Module; (behind fan shroud)
- Buick Enclave 2009: Electronic Control Module; (behind fan shroud)
This unit is also a direct replacement for the following part numbers: 12623325, 12628387, 12630594, 19300016.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and the module will arrive ready to install with the latest GM software for your specific vehicle.
Where is the ECM located on my 2008 Cadillac CTS?
On the 2008-2009 Cadillac CTS, the ECM is typically located in the engine compartment on the right-hand (passenger) side. On other compatible models like the Acadia or Traverse, it is located behind the fan shroud. Always disconnect the battery before attempting removal or installation.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s crucial to ensure the problem has been properly diagnosed. This module will not fix issues caused by other faulty sensors or mechanical problems.
How do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a placard on the driver’s side dashboard visible through the windshield. It is also commonly found on the sticker inside the driver’s side door jamb.
Is this a difficult part to install?
For someone with moderate mechanical experience, the installation is straightforward. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to replace it with the new one. However, if you are not comfortable working on your vehicle, we always recommend professional installation.