2009-2010 Suburban Engine Computer 12625455 | Programmed to Your VIN

Is Your GM Truck or SUV Suddenly Unreliable?

If you’re dealing with a 2009 or 2010 Suburban, Silverado, Tahoe, or another GM vehicle from this era, you know how dependable they can be. But when the Engine Control Module (ECM) starts to fail, it can turn your trusted workhorse into a source of constant frustration. Are you experiencing baffling issues like random stalling, a crank-but-no-start condition, a check engine light that won’t go away, or strange transmission shifting? These are all classic signs that the brain of your engine has given up.

In my 20+ years as a technician, I’ve seen these exact symptoms countless times. A customer’s 2009 Sierra 2500 with the 6.0L came in last week with a no-start condition. The owner had already replaced the fuel pump and crank sensor. A quick scan with my diagnostic tool showed ‘No Communication with ECM.’ After verifying the module had proper power and ground at the connector—a critical first step—it was clear the ECM itself was internally faulted. This is a common failure point on these vehicles, often due to years of heat cycles and vibration.

The Direct, Dealer-Free Solution

Forget the hassle and expense of towing your vehicle to a dealership. This Engine Computer is the straightforward, reliable fix you need. We take all the guesswork and complexity out of the process. Simply provide us with 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 to install.

Key Benefits of This Programmed ECM:

• ✔ VIN-Programmed for Your Vehicle: We flash the module specifically for your truck or SUV, ensuring it communicates perfectly with the BCM, anti-theft system (Passlock/VATS), and all other onboard systems.
• ✔ Eliminates Dealer Programming: This module is a true plug-and-play solution. No need for expensive dealer-only tools or additional programming fees.
• ✔ Restores Peak Performance: A healthy ECM is critical for proper fuel mixture, ignition timing, and transmission control. Restore the power, smooth shifting, and fuel efficiency you’ve been missing.
• ✔ Wide Compatibility: This unit is a direct replacement for part numbers 12625455 and 12629009, fitting a huge range of GM models from the rugged Silverado 3500 and Express Van to the luxurious Escalade and even the Corvette.

Plug-and-Play Installation: Get Back on the Road Fast

Installing your new 2009-2010 Suburban Engine Computer is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps for a smooth installation:

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
2. Locate the Old ECM: On most trucks and SUVs (Suburban, Tahoe, Sierra, Silverado), the ECM is located in the engine bay on the driver’s side, near the firewall or fender. On Savana/Express vans, it’s often in the LH rear of the engine compartment.
3. Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid wiggling them side-to-side to prevent pin damage.
4. Remove the Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
5. Install the New ECM: Mount your new, pre-programmed module in place and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
6. Reconnect Battery & Test: Reconnect the negative battery terminal. Your vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Start the engine and enjoy your vehicle’s restored performance!

Expert Pro Tip: Before you plug in your new ECM, take a close look at the vehicle’s harness connectors. Over the years, the plastic can become brittle and the weather-pack seals can fail, allowing moisture inside. I’ve seen perfectly good replacement modules fail to communicate simply because of a small amount of green corrosion on a single pin. Use a small pick and some electronics cleaner to ensure every pin and socket is bright and clean. This five-minute check can save you hours of diagnostic headaches.

Don’t let a faulty module keep you sidelined. This is the most effective and efficient way to solve complex electronic issues and restore your GM vehicle’s reliability. Order your pre-programmed 2009-2010 Suburban Engine Computer today and take control of your repair.