Restore Peak Performance to Your GM Vehicle
Is your Chevrolet, GMC, Cadillac, or other GM vehicle suffering from frustrating issues like intermittent stalling, a persistent Check Engine Light, or a complete no-start condition? These are often the tell-tale signs of a failing Engine Control Module (ECM). As the central computer for your engine, a faulty ECM can disrupt everything from fuel delivery and ignition timing to transmission shifting, leaving you stranded and facing a costly dealership visit. This replacement engine computer is the reliable, cost-effective solution you’ve been looking for, specifically designed to restore your vehicle’s original performance and efficiency.
Forget the hassle and expense of dealership programming. We take care of the most critical step for you. Before this module ships, our experts will flash it with the latest official GM software updates, precisely matched to your vehicle using the VIN you provide at checkout. This means your new 2009 Impala Engine Computer arrives ready for a straightforward installation, eliminating the need for specialized scan tools or additional programming fees. It’s a direct-fit replacement for part numbers 12625455 and 12629009, ensuring seamless integration with your vehicle’s systems.
From the Diagnostic Bay: The Silverado That Wouldn’t Start
A few months back, a 2009 Silverado 2500 with the 6.0L was towed into my shop. The owner was frustrated; it would crank but never fire up. He’d already replaced the battery and checked the fuel pump. My initial scan showed a flurry of communication loss codes (U-codes) and a hard P0601 ‘Internal Control Module Memory Check Sum Error’. This code is a dead giveaway. The ECM’s internal processor had failed. Instead of sending him to a dealership for a new module and a hefty programming bill, we ordered one of these pre-programmed units. It arrived two days later, we performed the simple security relearn procedure, and the truck fired up on the first try. The customer saved hundreds of dollars and got his work truck back on the road fast.
Is Your GM Vehicle Showing These ECM Failure Signs?
- ✔ Unexplained Check Engine Light illumination.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A complete no-start condition where the engine cranks but won’t turn over.
- ✔ Noticeable decrease in fuel economy.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Communication error codes, such as U0100 (Lost Communication with ECM/PCM).
- ✔ Internal module failure codes, including P0601, P0602, P0604, or P0606.
Your Straightforward ECM Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- ✔ Locate the ECM: On the 2009 Impala, the ECM is found attached to the lower part of the air cleaner box. On trucks and SUVs, it’s typically in the front-left (driver’s side) of the engine compartment.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- ✔ 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 ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware. Reconnect the wiring harnesses, ensuring they click securely into place.
- ✔ Reconnect Battery: Re-attach the negative battery terminal.
- ✔ Perform Security Relearn: Your vehicle will likely require a simple security relearn procedure to recognize the new ECM. This can typically be done without special tools by cycling the key in the ignition. We include instructions for this easy but essential step.
Verified Compatibility for a Wide Range of GM Models
This ECM is a direct replacement for a vast array of General Motors vehicles. While this is a perfect solution for a 2009 Impala Engine Computer, it also fits many other popular models. Please verify your part number and check the list below to ensure an exact match for your car, truck, or van.
SILVERADO 2500 PICKUP 10 (LH front engine), 6.0L, VIN K (opt LY6)
SUBURBAN 1500 09 (LH front engine)
VUE 10 3.5L
ESCALADE 09 (LH front engine), 6.2L
ESCALADE ESV 09 (LH front engine)
G6 09 (LH front engine), 3.9L
SIERRA 2500 PICKUP 09 (LH front engine), 6.0L
SILVERADO 3500 PICKUP 09 (LH front engine), 6.0L
HUMMER H2 09 (LH front engine)
MALIBU 09 3.5L
AVALANCHE 1500 09 (LH front engine)
SIERRA 1500 PICKUP 09 (LH front engine), w/o hybrid; w/o 4.3L
TAHOE 09 (LH front engine), w/o hybrid option
YUKON XL 2500 09 (LH front engine)
CORVETTE 09 (RH engine), Base
G8 09 ID 12625455
YUKON 09 (LH front engine), w/o hybrid option
IMPALA 09 (lower air cleaner box), 3.5L & 3.9L
… and many more models from 2009-2010. Please match your part number (12625455 or 12629009) for guaranteed fitment.
Frequently Asked Questions
What do you mean by ‘programmed to my VIN’?
After you place your order, you provide us with your 17-digit Vehicle Identification Number (VIN). We use this number to load the exact, factory-correct software for your vehicle’s specific options and engine onto the engine computer. This ensures it works correctly right out of the box.
Will I need to do anything else after installing it?
In most cases, you will need to perform a simple security relearn procedure, also known as a ‘key learn’ or ‘anti-theft relearn’. This process syncs the new ECM with your vehicle’s anti-theft system. We provide easy-to-follow instructions for this procedure, which typically takes about 30 minutes and requires only your car key.
Is this a new or used part?
This is a high-quality, tested, and verified replacement part that has been expertly prepared for service. Each unit undergoes rigorous inspection and is programmed with the latest software to ensure reliability and performance that meets or exceeds original specifications.
My old part number is 12629009. Will this part work?
Yes. This ECM, part number 12625455, is a fully compatible and interchangeable replacement for part number 12629009. It will function identically once programmed to your vehicle’s VIN.
How do I provide my VIN?
After completing your purchase, you will receive instructions on how to send us your vehicle’s VIN. We cannot program and ship your part until we receive this information, so please provide it promptly to avoid delays.