If you’re dealing with frustrating and unpredictable issues in your 2006 Pontiac Montana, like stalling, a persistent check engine light, or a complete no-start condition, the root cause is often a failing Engine Control Module (ECM). As the central computer of your vehicle, a faulty ECM can create a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. Stop chasing symptoms and address the core problem with a dependable, correctly programmed replacement.
This is a direct-fit replacement 2006 Montana Engine Control Module, meticulously prepared to restore your vehicle’s performance and dependability. The most significant benefit we offer is our professional VIN programming service. Before we ship your part, we flash it with the latest official GM software updates tailored specifically to your vehicle. This critical step ensures seamless communication between the engine, transmission, and all other onboard systems, eliminating the need for an expensive trip to the dealership for programming. It arrives at your door ready for installation.
A Technician’s Notebook: The Intermittent No-Start Puzzle
I remember a 2006 Montana SV6 that came into the shop with a maddening intermittent no-start condition. The owner had already replaced the battery and starter. It would run fine for days, then refuse to crank. When we’d get it, it would start right up. After checking all the usual suspects—grounds, relays, ignition switch—I noticed the failures only happened after the van had been sitting in the sun. On a hunch, I used a heat gun on the ECM, which is located in the driver’s side engine compartment. Sure enough, after a few minutes of heat, the security light would flash and it wouldn’t start. An internal solder joint on the board was failing when it expanded with heat. A replacement, programmed ECM solved the problem permanently. These intermittent electrical faults are a classic sign of ECM failure.
Is Your Montana Showing These Signs of ECM Failure?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Check Engine Light is on with communication error codes (like U0100) or internal processor fault codes (P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Issues with other electronic systems, as the ECM communicates with multiple modules.
Your Straightforward Installation Guide
Installing your new 2006 Montana Engine Control Module is a manageable job for a DIYer with basic tools. Our pre-programming service makes it a true plug-and-play process.
- 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: On the 2006 Montana, the ECM is typically found in the engine compartment on the driver’s side, often near the firewall or air filter housing.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves. There may be multiple connectors.
- 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 in place and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step: Some vehicles require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for specific instructions if needed. Your vehicle is now ready to start.
By purchasing this module, you are getting a reliable part that is guaranteed to function correctly with your vehicle’s specific configuration. This part is a direct replacement for several service numbers, including 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737, ensuring wide compatibility.
Verified Compatibility Across GM Models
While this is a core part for the 2006 Montana Engine Control Module, it also fits a wide variety of other General Motors vehicles. Please verify your model, year, and engine options below to ensure a perfect match.
ACADIA 07-08 Electronic Control Module; (behind fan shroud), ID 12607096 (ECM)
ALLURE 08-09 Electronic Control Module; (lower air cleaner housing), 5.3L
AURA 08-09 Electronic Control Module; (RH firewall), 2.4L, w/hybrid
CANYON 08 Electronic Control Module; (RH firewall)
COBALT 06 Electronic Control Module; (LH front engine compartment), 2.4L (VIN B)
COLORADO 08 Electronic Control Module; (RH firewall)
CTS 06 Electronic Control Module; (RH engine compartment), V-Series, ID 12603530
DEVILLE 05 Electronic Control Module; (LH engine compartment), ID 12590032
DTS 06-08 Electronic Control Module
ENCLAVE 08 Electronic Control Module; (behind fan shroud)
ENVOY 07-09 Various Engines & IDs
G6 06-09 Various Engines & IDs
GRAND PRIX 08 Electronic Control Module; (lower air cleaner box), 5.3L
HHR 06 Electronic Control Module; (LH rear engine compartment), 2.4L
HUMMER H3 08 Electronic Control Module; (RH firewall)
IMPALA 06-09 Various Engines
ISUZU ASCENDER 08 4.2L
ISUZU I-290/I-370 08 (RH firewall)
LACROSSE 08-09 Electronic Control Module; 5.3L
LUCERNE 06-08 Electronic Control Module; 4.6L
MALIBU 06-10 Various Engines
MONTE CARLO 06 3.5L & 3.9L
…and many more. Please check the full list provided in the initial data to confirm your specific vehicle.
Do I really need to provide my VIN?
Do I really need to provide my VIN?
Yes, absolutely. Providing your Vehicle Identification Number (VIN) is essential. We use it to load the precise, factory-correct software for your vehicle’s specific options and emissions systems. This step is what makes the module a true plug-and-play solution and prevents compatibility issues.
Is this part difficult to install for a DIYer?
No, for most individuals with basic mechanical skills, this is a straightforward replacement. The main tasks are disconnecting the battery, unplugging a few connectors, and unbolting the module. Since we handle the programming, you won’t need any special electronic tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes include P0601-P0606 or communication codes), then yes, this part is the correct fix. However, if the light is on due to a faulty sensor or other component, that separate issue will still need to be addressed.
What does ‘interchangeable service number’ mean?
Manufacturers often release updated versions of a part over the years. The different service numbers (like 12602044, 12607096, etc.) are all physically and electronically compatible with the original 12590032. We ensure the module you receive is a correct replacement for any of those listed numbers.