Restore Peak Performance to Your GM Truck or SUV
Is your Chevrolet Colorado, GMC Canyon, or other compatible GM vehicle suffering from frustrating issues like a persistent check engine light, poor fuel mileage, or erratic engine behavior? A failing Engine Control Module (ECM) is often the culprit. As the ‘brain’ of your vehicle’s engine management system, its proper function is critical. This direct-fit replacement ECM, part number 12678512, is the definitive solution to get your truck back on the road, running smoothly and reliably.
Unlike sourcing a module from a salvage yard or a big-box store, this ECM arrives at your doorstep ready for installation. We take the guesswork and extra cost out of the equation by professionally programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This ensures all factory settings and the latest GM software updates are loaded, providing optimal performance and compatibility right out of the box. Simply provide your VIN at checkout, and we handle the rest.
Case Study: A Tricky Diagnosis
I recently had a 2011 Chevy Colorado in my bay that was driving the owner crazy. It had an intermittent no-start condition and would occasionally stall at stoplights. The owner had already replaced the fuel pump and crankshaft position sensor based on advice from forums, but the problem persisted. No hard fault codes were stored, just a few communication loss history codes (U-codes). After hooking up my scope, I noticed the 5-volt reference signal from the ECM would intermittently drop out, causing the sensors to go offline. This pointed directly to an internal failure in the original ECM. We installed one of our pre-programmed modules, and the truck has been running perfectly ever since. It’s a classic example of how a failing ECM can mimic other component failures.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or misfiring
- ✔ Drastic decrease in fuel economy
- ✔ No-start or hard-starting conditions
- ✔ Communication error codes, such as U0100
- ✔ Internal module failure codes, like P0601 or P0606
- ✔ Harsh or incorrect shifting from the automatic transmission
A Straightforward Guide to Installation
Installing your new 2009-2012 Colorado ECM is a manageable job for a confident DIYer. Follow these steps carefully for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the ECM: On the 2009-2012 Colorado/Canyon, the ECM is typically located on the right-hand (passenger side) of the firewall in the engine bay.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘On’ position (without starting) for 10-15 seconds, then turn it off. Repeat this once more. This allows the other modules to recognize the new ECM. You can now start the vehicle.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. While this is a perfect fit for the 2009-2012 Colorado ECM requirement, please verify your specific model and engine in the list below. This unit is interchangeable with service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
CTS 2009 (6.2L)
DTS 2009-2011
SRX 2009 (4.6L)
STS 2009 (4.4L, 4.6L), 2010 (4.6L)
XLR 2009
CHEVROLET:
COLORADO 2009 (All Engines), 2010-2012 (2.9L, 3.7L)
CORVETTE 2009 (ZR1)
TRAILBLAZER 2009 (6.0L)
GMC:
CANYON 2009 (All Engines), 2010-2012 (2.9L, 3.7L)
ENVOY 2009 (5.3L)
HUMMER:
H3 2009 (All Engines), 2010 (3.7L)
BUICK:
LUCERNE 2009-2011 (4.6L)
SAAB:
9-7X 2009
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Just provide your VIN during checkout, and the module will arrive ready to install and start your vehicle.
Is this a new or used part?
This is a high-quality, tested replacement part that has been verified for full functionality and programmed with the latest stable software from GM for your specific vehicle.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original ECM (e.g., codes P0601-P0606), then yes, this part is the correct fix. It’s always best to have the codes professionally diagnosed to confirm the ECM is the point of failure.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. An ECM (Engine Control Module) specifically manages engine functions. A PCM (Powertrain Control Module) manages both the engine and the transmission. For your 2009-2012 Colorado, this module serves as the central powertrain computer.
What if I provide the wrong VIN?
The VIN is critical for correct programming. An incorrect VIN will result in a no-start condition or other major performance issues. Please double-check the VIN from your driver’s side door jamb sticker or your vehicle’s registration before submitting your order.