Restore Your Cadillac’s Performance and Reliability
If you’re dealing with frustrating engine problems in your 2006 Cadillac STS—like stalling, a persistent check engine light, or a no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, the ECM manages everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire vehicle suffers. I’ve seen it hundreds of times in my 20+ years in the shop: a perfectly good engine brought to its knees by a faulty computer.
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and dealer hassle out of the equation. This genuine GM Engine Control Module (part number 12607096) will be professionally programmed with the latest GM software updates specifically for your vehicle’s VIN. This ensures perfect communication with your car’s other systems and restores the precise performance and fuel efficiency you expect. You get a reliable fix that’s ready to install right out of the box, saving you time and the high cost of dealership programming.
Is Your GM Vehicle Showing These ECM Failure Signs?
A failing ECM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, this module is the likely solution. In my experience, these are the most common indicators:
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine cranks but refuses to start.
- ✔ Intermittent stalling or rough idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Car goes into “limp mode” with reduced power.
- ✔ Communication error codes are present, such as P0601, P0606, or U0100.
- ✔ Unexplained transmission shifting problems.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Chevy Trailblazer with an intermittent no-start condition. It would run fine for days, then suddenly refuse to crank. There were no consistent trouble codes, just a random U0100 (Lost Communication with ECM) that would appear and disappear. We checked the battery, starter, and wiring harnesses—all were perfect. After hours of diagnostics, we hooked up a lab scope to the ECM’s power and ground circuits. We discovered that the internal voltage regulator within the original ECM was failing under certain temperature conditions, causing it to shut down randomly. Swapping in a VIN-programmed ECM like this one solved the problem instantly. It’s a classic example of how a failing computer can mimic a mechanical issue.
A Straightforward Guide to Your ECM Installation
Installing your new ECM is a manageable job for a DIYer with basic tools. For the 2006 Cadillac STS, the ECM is located on the driver’s side frame rail. Always consult a repair manual for your specific vehicle’s location and torque specs.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On the 2006 STS, you’ll find the module mounted to the left (driver’s side) frame rail in the engine bay. Other vehicles on the fitment list may have it on the firewall or in the air cleaner housing.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Perform Relearn Procedure: In many GM vehicles, a security relearn (also known as a Passlock or anti-theft relearn) is required. This can typically be done without special tools by cycling the key in the ignition. A common procedure is: Turn the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeat two more times. Then, the vehicle should start.
Verified Vehicle Compatibility List
This ECM is a direct replacement for service numbers 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. It fits a wide range of GM vehicles. Please verify your model and options below.
ACADIA 07-08 ID 12607096/19210737
AURA 08-09 2.4L Hybrid, 3.6L
CANYON 08
COBALT 06 2.4L
COLORADO 08
CTS 06 V-Series ID 12603530
DEVILLE 05 ID 12590032
DTS 06, 08
ENCLAVE 08 ID 12607096/19210737
ENVOY 07-08 5.3L
ENVOY 08-09 4.2L
G6 06-09 3.6L (Check ID)
GRAND PRIX 08 5.3L
HHR 06 2.4L
HUMMER H3 08
IMPALA 06 3.5L, 3.9L
IMPALA 08-09 5.3L
ION 06 2.4L
ISUZU ASCENDER 08 4.2L (Check ID)
ISUZU I-290 08
ISUZU I-370 08
LACROSSE 08-09 5.3L
LUCERNE 06, 08 4.6L (Check ID)
MALIBU 06 3.9L
MALIBU 08-10 2.4L Hybrid
MALIBU 08-09 3.6L
MONTE CARLO 06 3.5L, 3.9L
MONTANA 06, 08-09 3.9L
OUTLOOK 08
PURSUIT 06 2.4L
RAINIER 07 5.3L
RELAY 06 3.9L
SAAB 9-7X 07 8-Cyl
SAAB 9-7X 08 5.3L, 6.0L
SOLSTICE 06
SRX 08 4.6L
STS 06 4.4L
STS 08 4.4L, 4.6L
TERRAZA 06 3.9L
TRAILBLAZER 07 5.3L, 6.0L
TRAILBLAZER 08-09 4.2L (Check ID)
UPLANDER 06, 08-09 3.9L (Check ID)
VUE 08-09 2.4L
VUE 08-10 3.6L
XLR 06, 09 4.4L
XLR 08
Frequently Asked Questions
Do I need to do any programming myself?
No. This 2006 STS Engine Control Module arrives at your door fully programmed to your vehicle’s VIN with the latest GM software. It is ready for installation right out of the box.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory specifications for your car, including engine type, transmission, and other options. This ensures the programming is a perfect match, guaranteeing proper function and avoiding compatibility issues.
Is a security relearn difficult?
Not at all. For most compatible GM vehicles, it’s a simple procedure that involves cycling the ignition key and waiting for set periods. It requires no special tools and instructions can easily be found online or in your owner’s manual.
What does it mean that this part is interchangeable?
It means this single ECM hardware (part #12607096) can replace several different original part numbers from the factory. With the correct VIN-specific programming, it functions identically to any of the listed service numbers, making it a versatile and reliable solution for many vehicles.
Is this a guaranteed fix for my check engine light?
If your vehicle’s issues and diagnostic trouble codes point to a failed ECM, this part is the correct solution. However, a check engine light can be caused by many other components. Always perform a proper diagnosis to confirm the ECM is the point of failure before ordering.