Restore Peak Performance and Reliability to Your GM Vehicle
Is your vehicle suffering from frustrating issues like a persistent Check Engine Light, sudden stalling, poor fuel mileage, or a no-start condition? These are often the tell-tale signs of a failing Engine Control Module (ECM), the computer that serves as your engine’s brain. Don’t let a faulty module keep you off the road. This replacement Engine Control Module, part number 12622175, is the definitive solution to restore your vehicle’s original performance and efficiency.
As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause a cascade of confusing problems. This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and expense out of the repair by pre-programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest GM software updates, ready for a straightforward installation. You get a reliable fix that eliminates the need for expensive dealership programming tools or additional service appointments.
A Technician’s Notebook: The Intermittent Stall Case
I remember a 2009 Envoy that came into the shop with a ghost of a problem: it would run perfectly for 20-30 minutes and then stall without warning, only to restart after cooling down. No consistent trouble codes were stored, making diagnosis a nightmare. After checking fuel pressure and ignition systems, my experience pointed toward the ECM. We connected a scan tool to monitor live data and went for a long drive. Sure enough, as the engine bay heated up, the ECM data streams for injector pulse width started fluctuating wildly right before it stalled. A failing processor on the circuit board was becoming unstable with heat. Replacing the ECM with a pre-programmed unit like this one solved the problem permanently. It’s a classic failure mode that basic diagnostics can sometimes miss.
Is Your Vehicle Showing These ECM Failure Signs?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Unexplained drop in fuel economy.
- ✔ Hard starting or complete no-start conditions.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100 stored in memory.
- ✔ Loss of communication with the module when using a scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the ECM: Find the old Engine Control Module. On many of these vehicles, it’s located on the LH side of the engine, on the RH firewall, or inside the air cleaner box. Refer to your vehicle’s service manual for the exact location.
- ✔ Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount the new, pre-programmed ECM in the same location and secure it with the original bolts. Reconnect the wiring harnesses, ensuring they click securely into place.
- ✔ Reconnect Battery: Re-attach the negative battery terminal.
- ✔ Perform Relearn Procedure: A security relearn (Passlock/VTD) and a Crankshaft Variation (CASE) relearn are typically required after installation. This can often be done without special tools and is a necessary final step for proper communication and operation.
Verified Compatibility for Your Vehicle
This module is a direct replacement for service number 12622175 and is interchangeable with part numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12630464, and 12678512. It is guaranteed to fit the following models:
COLORADO 09-12 (2.9L, 3.7L)
CORVETTE 09 (ZR1)
CTS 09 (6.2L)
DTS 09-11
ENVOY 09 (5.3L)
HUMMER H3 09-10 (3.7L)
LUCERNE 09-11 (4.6L)
SAAB 9-7X 09
SRX 09 (4.6L)
STS 09-10 (4.4L, 4.6L)
TRAILBLAZER 09 (6.0L)
XLR 09
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipping. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest official GM software specific to your vehicle.
Why do you need my VIN?
The Vehicle Identification Number (VIN) allows us to access the exact factory calibration file for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and performance, just like a new part from the dealer.
What is a security or CASE relearn?
After installing the new ECM, your vehicle’s anti-theft system (security) and crankshaft position sensor (CASE) need to be synchronized with the new module. This is a standard procedure for GM vehicles and instructions are readily available online or in service manuals.
Will this fix my check engine light?
If the Check Engine Light is caused by an internal failure of the ECM (like DTC P0601), then yes, this part will resolve the issue. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.
Is this a used part?
This is a high-quality, tested, and verified recycled OEM part. Each unit is inspected and programmed to ensure it meets or exceeds original factory performance standards, providing a reliable and cost-effective repair.