Restore Your Vehicle’s Performance and Reliability
Is your vehicle suffering from frustrating, hard-to-diagnose issues like intermittent stalling, a no-start condition, poor fuel economy, or a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer of your vehicle. This direct-fit ECM is the definitive solution, designed to restore your engine’s proper function and get you back on the road with confidence. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN before it ships.
Case Study: The Ghost in the Machine
I once had a 2010 Chevy Colorado in the bay that was a real head-scratcher. The owner complained of random stalling and a complete no-start that would happen without warning. We checked fuel pressure, spark, and all the usual suspects—everything tested fine. The scanner showed intermittent communication loss codes (U0100). After hours of chasing wires, we swapped in a known-good ECM. The truck fired up instantly and ran perfectly. The original ECM had an internal failure that only showed up under specific conditions. This experience taught me that when the basics check out but communication is faulty, the ECM is often the culprit. A pre-programmed module like this one would have saved hours of diagnostic time.
Is Your Vehicle Showing These Symptoms?
A failing ECM can cause a wide range of problems that can be mistaken for other component failures. If you’re experiencing any of the following, your engine computer may be at fault:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other processor faults.
- ✔ Engine cranks but refuses to start.
- ✔ Intermittent stalling or hesitation while driving.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic engine idle.
- ✔ Transmission shifting problems or communication errors with the TCM.
- ✔ Loss of communication with the diagnostic scan tool.
The Advantage of a VIN-Programmed 2009 Envoy ECM
Forget expensive dealership visits or the need for specialized programming tools. When you order from us, you get a module that is ready for installation right out of the box. We use your vehicle’s unique Vehicle Identification Number (VIN) to load the latest, most stable GM factory software onto the module. This ensures perfect compatibility with your engine, transmission, and all related systems, restoring the precise performance your vehicle had when it left the factory. This is the most reliable and straightforward way to replace a faulty 2009 Envoy ECM.
A Straightforward Guide to Installation
Installing your new ECM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all systems to power down.
- Locate the ECM: On most of these vehicles, the ECM is located in the engine bay, often on the firewall, inner fender, or near the air cleaner box. Refer to your vehicle’s service manual for the exact location.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical 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. There are typically a few 10mm or 13mm bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click and the locking tabs are secure. Reconnect the negative battery terminal.
- Perform Relearn (If Necessary): While this module is programmed, some vehicles require a security or crank position sensor relearn procedure. This can often be done without a scan tool by cycling the key. Check your service manual for any specific procedures for your vehicle.
Verified Vehicle Compatibility
This Engine Control Module, part number 1263605, is a direct replacement for service numbers 12636659, 12639300, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. It fits the following vehicles:
- 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: 2009-2012 (2.9L, 3.7L)
- Chevrolet Corvette: 2009 (ZR1)
- Chevrolet Trailblazer: 2009 (6.0L)
- GMC Canyon: 2009-2012 (2.9L, 3.7L)
- GMC Envoy: 2009 (5.3L)
- Hummer H3: 2009-2010 (3.7L)
- Saab 9-7X: 2009
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your vehicle. It arrives ready to install.
Is this a simple plug-and-play installation?
Yes, for most vehicles it is. After physical installation, some models may require a simple key-cycle relearn procedure for the security system, which does not require special tools. We always recommend consulting your vehicle’s service manual for any post-installation steps.
How do I find my VIN?
Your Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my specific problem?
This module corrects issues directly caused by a faulty ECM, such as internal processor errors (P0601), no-start conditions, and communication faults. While it solves many common problems, it’s essential to ensure your vehicle has been properly diagnosed by a qualified technician, as other failing sensors or wiring issues can cause similar symptoms.