Is Your Trailblazer Experiencing Frustrating Engine Problems?
A failing Engine Control Module (ECM) can turn your reliable truck into a source of constant headaches. If you’re dealing with a persistent check engine light, unexplained stalling, rough idling, poor fuel economy, or a complete no-start condition, the ECM is often the culprit. In my 20+ years as a diagnostic technician, I’ve seen how a faulty computer can mimic a dozen other mechanical issues, leading to expensive and unnecessary repairs. Don’t replace sensors and chase ghostsโget to the heart of the problem.
From the Shop Floor: A Real-World Diagnosis
Just last month, a 2009 Trailblazer with the 6.0L V8 was towed to my bay. The owner had replaced the throttle body and MAF sensor, but it still wouldn’t stay running and had a P0606 (ECM Processor Fault) code. After confirming the ECM had solid power and ground connections, we knew the internal processor was failing. We installed one of our pre-programmed ECMs, and the truck fired right up and idled perfectly. The customer drove away in less than 30 minutes, saving hundreds on dealer programming fees and diagnostic time.
The Direct-Fit, Hassle-Free Solution
This is a genuine GM Engine Control Module, part number 12628993, that arrives at your door ready for installation. The biggest challenge with replacing an ECM is the required programmingโa step that traditionally forces you to a dealership. We eliminate that completely. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our technicians will program the module with the latest, most stable software from General Motors specifically for your Trailblazer.
- โ VIN-Programmed for Your Vehicle: We flash the computer with the newest GM updates matched to your exact vehicle configuration.
- โ Truly Plug-and-Play: No expensive dealer visits or special tools are required for installation.
- โ Solves Common Issues: A direct solution for error codes, poor performance, and no-start conditions related to a faulty ECM.
- โ Guaranteed Compatibility: This module is a direct replacement for a wide range of GM vehicles and part numbers.
Easy Installation for the DIYer
Replacing the 2009 Trailblazer ECM is a straightforward job you can do in your own driveway. On the Trailblazer, you’ll find the ECM located on the driver’s side of the engine.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for all system capacitors to discharge.
- Locate the ECM: Find the module on the LH (driver’s) side of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old ECM. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect Everything: Securely plug the wiring harnesses back into the new module until they click. Reconnect the negative battery terminal.
- Final Step: Start the engine. The vehicle will perform a security relearn procedure on its own, and you’ll be ready to go.
Guaranteed Fitment & Part Number Cross-Reference
This module is a verified replacement for several service numbers. If your original module has any of the following numbers, this part is a direct match for you: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, or 12678512.
It is also the correct Electronic Control Module for the following vehicles and configurations:
- Buick Lucerne: 2009-2011 (4.6L)
- Cadillac CTS: 2009 (6.2L)
- Cadillac DTS: 2009-2011
- Cadillac SRX: 2009 (4.6L)
- Cadillac STS: 2009 (4.4L, 4.6L), 2010 (4.6L)
- Cadillac XLR: 2009
- Chevrolet Colorado: 2009, 2010-2012 (2.9L, 3.7L)
- Chevrolet Corvette: 2009 (ZR1)
- Chevrolet Trailblazer: 2009 (6.0L)
- GMC Canyon: 2009, 2010-2012 (2.9L, 3.7L)
- GMC Envoy: 2009 (5.3L)
- Hummer H3: 2009, 2010 (3.7L)
- Saab 9-7X: 2009
Get your vehicle back on the road with confidence. Order your pre-programmed 2009 Trailblazer ECM today and experience the difference a properly functioning computer makes.