Restore Peak Performance to Your GM Truck or SUV
Is your 2009 or 2010 Silverado 2500, Sierra, Tahoe, or other GM vehicle running rough, stalling, or showing a persistent check engine light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s most critical functions. A faulty ECM can cripple your vehicle’s performance, reliability, and fuel economy. This direct-replacement ECM, part number 12629009, is the definitive solution to get your vehicle running like new again.
The ECM is the brain of your engine, constantly analyzing data from sensors to control fuel injection, ignition timing, variable valve timing, and transmission shifting. When it fails, the communication network breaks down, leading to a cascade of problems. Our replacement module restores this vital communication, ensuring your engine operates precisely as the manufacturer intended. Best of all, we eliminate the most difficult part of the repair: programming. Simply provide your vehicle’s VIN at checkout, and we will flash the module with the latest GM-certified software for your specific vehicle. It arrives at your door ready for a simple, plug-and-play installation.
From the Diagnostic Bay
We had a 2009 Sierra 2500 come into the shop with a list of bizarre, intermittent issues. The owner had already replaced the throttle body and a couple of O2 sensors trying to chase down a rough idle and stalling problem. The codes were all over the place. After checking the wiring harnesses and grounds (always the first step!), we connected our scope to the ECM’s main communication lines. We saw a noisy, inconsistent signal that pointed directly to an internal failure in the module. Instead of continuing to throw parts at the problem, we installed a VIN-programmed ECM. The truck fired up instantly, idled smoothly, and all the trouble codes were gone. It’s a powerful reminder that sometimes the root cause is the central controller itself.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or erratic idling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Misfire codes (e.g., P0300, P0301) even after replacing plugs and coils.
- ✔ Complete no-start condition where the engine cranks but will not fire.
- ✔ Communication errors with diagnostic scan tools.
The Simple Solution: A Pre-Programmed 2009-2010 Silverado 2500 ECM
Replacing an ECM used to mean a trip to the dealership for expensive programming and key relearning procedures. Our service streamlines this entire process. By providing your VIN, you receive a module that is a perfect match for your vehicle’s factory settings and security system. This ensures all components, from the fuel injectors to the anti-theft system, function together seamlessly. This module is a direct replacement for part numbers 12629009 and 12625455, covering a wide range of GM vehicles from this era.
Installation is straightforward for a DIY mechanic. On most trucks like the Silverado and Sierra, the ECM is located in the front left (driver’s side) of the engine compartment. Simply disconnect the negative battery terminal, carefully unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the connectors and the battery, and you’re ready to go. No special tools, no dealer visit, just a reliable fix.
Frequently Asked Questions
Do I need to program this ECM?
No. This ECM comes fully programmed to your vehicle’s specific VIN. Just provide us with your VIN during or after checkout, and we handle all the flashing with the latest GM software before it ships.
Where is the ECM located on my 2009-2010 Silverado 2500?
On the 2009-2010 Silverado and Sierra 2500/3500 models, the ECM is typically located in the engine bay on the driver’s side, near the firewall or fender well.
Will this fix my check engine light?
If the check engine light and associated codes are caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to ensure other potential causes (like faulty sensors or wiring) have been ruled out.
Is this a direct replacement for part number 12625455?
Yes, this module, 12629009, is a fully compatible and interchangeable replacement for the original part number 12625455.
What information do you need from me?
We only need your 17-digit Vehicle Identification Number (VIN) to program the module correctly for your truck’s specific engine, transmission, and options.