Restore Peak Performance to Your GM Diesel Truck or Van
Is your 2006-2007 Silverado, Sierra, Savana, or Express van suffering from frustrating engine problems? A faulty Engine Control Module (ECM) is often the culprit behind issues like poor performance, intermittent stalling, a persistent check engine light, or even a no-start condition. The ECM is the brain of your Duramax engine, managing critical functions from fuel injection timing to transmission shifting. When it fails, it can bring your entire operation to a halt. This direct-fit replacement ECM, part number 12603623, is the definitive solution to get your reliable workhorse back on the road.
Unlike a generic module from a parts store, this unit is delivered to you fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest, most stable software updates from GM, ensuring optimal engine performance, fuel efficiency, and emissions compliance. This critical programming step eliminates the need for expensive dealership visits and specialized scan tools, making the replacement process as straightforward as possible.
From the Diagnostic Bay
We had a 2006 Silverado 2500 HD towed in that had stumped two other shops. The owner had already spent a fortune replacing all eight injectors, the fuel pressure regulator, and the FICM harness, but the truck still had a dead miss on cylinder 5 and would randomly shut off. Standard diagnostics showed no injector command signal for that cylinder. Instead of throwing more parts at it, we scoped the injector driver circuit directly at the ECM connector. The signal was gone. The internal driver inside the original ECM had failed—a common issue due to heat and vibration. We installed one of our VIN-programmed ECMs, performed a quick security relearn, and the truck fired up and ran perfectly. It’s a classic case of diagnosing the brain, not just the symptoms.
Is Your GM Diesel Showing Signs of ECM Failure?
A failing ECM can manifest in numerous ways. If your truck or van is experiencing any of the following, it’s a strong indicator that your engine’s computer may need replacement. Look out for:
- ✔ Persistent Check Engine Light (CEL) with communication-related trouble codes (e.g., U-codes).
- ✔ Engine cranks but will not start.
- ✔ Rough or unstable idle.
- ✔ Noticeable loss of engine power and poor acceleration.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ Intermittent stalling or engine shutting off while driving.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Multiple, unrelated sensor error codes appearing simultaneously.
- ✔ No communication with your OBD-II scan tool.
The Superior Solution: A Pre-Programmed 2006-2007 GM Diesel ECM
Choosing our VIN-programmed ECM provides a seamless repair experience. We handle the complex part of the job before the module ever leaves our facility. By providing us with your VIN during checkout, you ensure that the module you receive is an exact match for your vehicle’s original factory specifications and options. This module is a direct replacement for a wide range of original part numbers, including 19260753, 12588335, 12606126, 12606127, 12604137, and YNAY, guaranteeing broad compatibility across the GM HD truck and van lineup for these model years.
Installation is straightforward for any competent DIY mechanic or professional technician. Simply disconnect the battery, locate and swap the old module with the new one, and reconnect the battery. In most cases, a simple security relearn procedure is all that’s needed to sync the new ECM with your vehicle’s anti-theft system, a process that can often be completed without any special tools. This plug-and-play approach saves you significant time and money compared to sourcing a used, unprogrammed module and paying for dealership labor.
Frequently Asked Questions
Do I need to program this ECM?
No. This ECM comes fully pre-programmed to your vehicle’s specific VIN. Simply provide your VIN to us after your purchase, and we will flash the module with the latest GM software before shipping it to you. This makes it a plug-and-play installation.
Where is the ECM located on my vehicle?
The location varies slightly by model. On 2006-2007 Silverado and Sierra pickups, the ECM is typically found in the engine bay on the driver’s side, underneath the battery tray. On Express and Savana vans, it is located in the LH rear or front of the engine compartment.
Will I need to perform any additional procedures after installation?
In some cases, a security relearn (also known as a VATS relearn) may be necessary to sync the new ECM with your vehicle’s ignition keys. This is a simple procedure that typically involves turning the key on and off in a specific sequence and does not require a special scan tool. A Crankshaft Variation Relearn (CASE relearn) may also be required, which does necessitate a capable scan tool.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot program and ship your part until we receive this information, so please provide it promptly to avoid delays.
Is this part compatible with my specific truck?
This ECM is a direct replacement for multiple part numbers and fits a wide range of 2006-2007 GM trucks and vans with the diesel engine, including the Silverado 2500/3500, Sierra 2500/3500, and Savana/Express 2500/3500. Please review the detailed fitment list on this page to confirm compatibility.