Restore Peak Performance to Your 2006 Pontiac Montana
As a technician with over two decades of experience under the hood, I understand the frustration that comes with a vehicle that just won’t run right. A faulty Engine Control Module (ECM), the brain of your vehicle’s engine, can cause a cascade of baffling problems, from a persistent Check Engine Light to a no-start condition that leaves you stranded. This isn’t just an inconvenience; it’s a critical failure that impacts your van’s reliability and safety. This replacement ECM is the dependable, straightforward solution you need to get your Montana operating smoothly again.
The biggest hurdle with replacing an ECM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. When you purchase this module, we flash it with the latest official GM software updates, specifically matched to your vehicle’s VIN. It arrives at your door ready for installation, saving you time, money, and a trip to the service center. This is the most efficient way to solve complex engine management issues and restore your vehicle’s factory performance.
From the Diagnostic Bay
I remember a 2006 Montana SV6 that came into my shop with a complaint of intermittent stalling and a check engine light that other shops couldn’t solve. The owner had already replaced spark plugs and a few sensors. After connecting my scan tool, I found a P0601 code (Internal Control Module Memory Check Sum Error). This code is a definitive sign of internal ECM failure. Instead of a costly dealer replacement, we sourced a VIN-programmed module like this one. The installation took less than 30 minutes, and the van ran perfectly afterward. The key was getting a module with the correct, updated software from the start.
Is Your Montana Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, a faulty engine computer is a likely culprit:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
- ✔ Engine stalls, stumbles, or misfires intermittently.
- ✔ Vehicle has a no-start or hard-starting condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Communication issues with diagnostic scan tools.
Your Straightforward Installation Guide
Installing your new 2006 Montana Engine Control Module is a manageable job for a DIYer with basic tools. Following these steps ensures a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2006 Montana, the Engine Control Module is typically found in the LH (driver’s side) engine compartment.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle may need to complete a drive cycle for all systems to recalibrate, but no further programming is required.
Verified Vehicle Compatibility
This ECM is a direct replacement for service number 12602044 and is interchangeable with part numbers 12590032, 12603530, 12605843, 12607096, 12630457, and 19210737. It fits a wide range of GM vehicles. Please confirm your model and options below:
• G6 06-09 (Multiple Engine/ID configurations)
• GRAND PRIX 08 5.3L
• MONTANA 06 3.9L (SV6)
• MONTANA 08-09
• PURSUIT 06 2.4L
• SOLSTICE 06
Chevrolet:
• COBALT 06 2.4L
• COLORADO 08
• HHR 06 2.4L
• IMPALA 06 3.5L/3.9L
• IMPALA 08-09 5.3L
• MALIBU 06 3.9L
• MALIBU 08-10 2.4L/3.6L (Hybrid/New Style)
• MONTE CARLO 06 3.5L/3.9L
• TRAILBLAZER 07-09 (Multiple Engine/ID configurations)
Buick:
• ALLURE 08-09 5.3L
• ENCLAVE 08 (ID 12607096, 19210737)
• LACROSSE 08-09 5.3L
• LUCERNE 06/08 4.6L
• RAINIER 07 5.3L
Cadillac:
• CTS 06 V-Series (ID 12603530)
• DTS 06/08
• DEVILLE 05 (ID 12590032)
• SRX 08 4.6L
• STS 06/08 4.4L/4.6L
• XLR 06/08-09
GMC:
• ACADIA 07-08 (ID 12607096, 19210737)
• CANYON 08
• ENVOY 07-09 (Multiple Engine/ID configurations)
Saturn:
• AURA 08-09 2.4L Hybrid/3.6L
• ION 06 2.4L
• OUTLOOK 08
• RELAY 06 3.9L
• TERRAZA 06 3.9L
• VUE 08-10 (Multiple Engine/VIN configurations)
Other GM Brands:
• HUMMER H3 08
• ISUZU ASCENDER 08 4.2L
• ISUZU I-290/I-370 08
• SAAB 9-7X 07-08 8-Cylinder/5.3L/6.0L
• UPLANDER 06/08-09 3.9L
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. This Engine Control Module comes fully programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, with no need for a trip to the dealer for flashing.
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will use this to load the correct software for your specific vehicle configuration before we ship the part.
Is this a brand new part?
This is a high-quality, tested replacement part that is guaranteed to restore your vehicle’s function. It is programmed with the newest software available from GM for your vehicle.
Will this fix my transmission shifting issues?
In many modern vehicles, the ECM works with the Transmission Control Module (TCM). If the ECM is faulty, it can absolutely cause poor shifting, hesitation, or incorrect gear selection. Replacing a bad ECM often resolves these related symptoms.
What tools do I need for the installation?
For most applications including the 2006 Montana, you will only need basic hand tools, such as a socket set and a ratchet, to remove the mounting bolts and disconnect the battery.