Restore Peak Performance and Reliability to Your GM Vehicle
Is your 2009 Trailblazer or other compatible GM vehicle experiencing frustrating issues like stalling, erratic idling, a persistent check engine light, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM). As the brain of your vehicle’s engine, a faulty ECM can disrupt everything from fuel delivery and ignition timing to transmission shifting, leaving you stranded and facing a costly dealership repair. This isn’t just an inconvenience; it’s a critical component failure that needs a reliable solution.
We offer a dependable and straightforward fix. This Engine Control Module, part number 12622175, is the definitive solution to get your vehicle running correctly again. The best part? We eliminate the most significant hassle of ECM replacement. Simply provide your vehicle’s VIN during checkout, and our experts will program the module with the latest, most stable software updates directly from GM. It arrives at your door ready for installation, saving you hundreds of dollars in dealership programming fees and diagnostic time.
Case Study: A Tricky Diagnosis
I once had a 2010 GMC Canyon in the shop that was a real head-scratcher. The customer complained of intermittent stalling and a transmission that seemed to have a mind of its own, but it only threw a generic U0100 ‘Lost Communication’ code. We checked all the wiring and connectors between the ECM and TCM, and everything looked perfect. On a hunch, we swapped in one of our pre-programmed ECMs. The problem vanished instantly. The original module’s internal processor was failing under load, causing it to drop communication intermittently without setting a more specific P0601 or P0606 code. This experience proved that even without a classic ‘bad ECM’ code, the module can still be the root cause of major drivability issues.
Is Your GM Vehicle Exhibiting These ECM Failure Signs?
A failing engine computer can cause a wide range of symptoms. If you’re noticing any of the following, a faulty ECM is a likely culprit.
- ✔ Check Engine Light is on or flashing
- ✔ Vehicle has trouble starting or won’t start at all (no-start condition)
- ✔ Poor engine performance, including rough idling, stalling, and hesitation
- ✔ Noticeable decrease in fuel economy
- ✔ Transmission shifting problems or harsh shifts
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0601, P0606, or U0100
A Straightforward Guide to Installation
With our pre-programmed module, installation is a simple mechanical swap. While exact locations vary by model, the general process is consistent. For a 2009 Trailblazer, the ECM is located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: Find the existing Engine Control Module. It’s a metal box with several large wiring harness connectors.
- Disconnect the Harnesses: Carefully release the locking tabs on each electrical connector 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 mounting hardware as you will need it for the new unit.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In most cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new ECM to sync with your vehicle’s anti-theft system. Afterwards, the vehicle should start and run properly.
Verified Vehicle Compatibility
This module is a direct replacement for service number 12622175 and is also interchangeable with 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12630464, and 12678512. It is guaranteed to fit the following vehicles:
CADILLAC DTS 2009-2011
CADILLAC SRX 2009 (4.6L)
CADILLAC STS 2009 (4.4L, 4.6L)
CADILLAC STS 2010 (4.6L)
CADILLAC XLR 2009
CHEVROLET COLORADO 2009-2012 (2.9L, 3.7L)
CHEVROLET CORVETTE 2009 (ZR1)
CHEVROLET TRAILBLAZER 2009 (6.0L)
GMC CANYON 2009-2012 (2.9L, 3.7L)
GMC ENVOY 2009 (5.3L)
HUMMER H3 2009-2010 (3.7L)
BUICK LUCERNE 2009-2011 (4.6L)
SAAB 9-7X 2009
Frequently Asked Questions
Do I need to do anything after installing this 2009 Trailblazer Engine Module?
Yes. After installation, you must perform a security relearn procedure, also known as a Passlock or anti-theft relearn. This procedure is simple, requires no special tools, and allows the module to communicate with your vehicle’s security system. Instructions are readily available online for your specific model or included with your part.
Is this part really plug-and-play?
Yes, because we program it to your vehicle’s specific VIN before shipping, it does not require a trip to the dealership for expensive flashing. Once you complete the security relearn, your vehicle is ready to go.
How do I provide my VIN?
Simply enter your 17-digit Vehicle Identification Number (VIN) in the designated box on the checkout page. We cannot process your order without it, as the programming is essential for the part to function.
What if my original part number is different from 12622175?
This module is a direct replacement for several service numbers, including 12636659, 12628993, and others listed in the description. As long as your vehicle and engine are on our compatibility list, this module will work perfectly.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601, P0606), then yes, this part will resolve the issue. However, you should always ensure other potential problems (sensors, wiring) have been properly diagnosed first.