Restore Your Minivan’s Reliability and Performance
Is your 2006 Pontiac Montana SV6 giving you headaches? If you’re dealing with a persistent check engine light, rough idling, unexpected stalling, or a frustrating no-start condition, the root cause is often a failing Engine Control Module (ECM). As the brain of your vehicle, a faulty ECM can throw your van’s entire operation into chaos. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. I’ve seen it countless times in the shop: owners chase down sensor after sensor, only to find the core problem was the computer all along.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost of dealership visits out of the equation. By providing us with your vehicle’s VIN at checkout, you will receive a professionally programmed 2006 Montana Engine Control Module loaded with the latest factory software from GM. This ensures perfect communication with your vehicle’s systems, restoring the smooth performance and fuel efficiency you expect.
From the Diagnostic Bay: The Intermittent Stall Case
A customer brought in their ’06 Montana SV6 with a tricky problem: it would run fine for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. No consistent check engine codes were stored, just a few random communication errors (U-codes) that would come and go. We checked fuel pressure, ignition components, and sensors—all tested fine. Experience told me to look at the ECM. On these vans, the ECM is located in the driver’s side of the engine compartment, where it’s exposed to heat cycles and vibration. Over time, internal solder joints can crack, causing these exact intermittent failures. We swapped in a VIN-programmed module like this one, and the problem was solved instantly. The customer saved hundreds by avoiding a dealership diagnosis and programming fee.
Is Your Montana Showing These Signs of ECM Failure?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty ECM is a likely culprit. Look out for:
- ✔ Unexplained Check Engine Light (CEL) activation
- ✔ Stalling, hesitation, or rough running conditions
- ✔ Complete no-start or difficult starting
- ✔ Poor fuel economy and reduced engine power
- ✔ Seemingly random warning lights on the dashboard
- ✔ Transmission shifting problems or harsh shifts
- ✔ Diagnostic Trouble Codes (DTCs) pointing to internal module failure, such as P0601, P0606, or communication loss codes like U0100.
Your Straightforward Installation Guide
Installing your pre-programmed ECM is a job most DIYers can handle in under an hour with basic hand tools. This process eliminates the need for expensive dealer-specific scan tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2006 Pontiac Montana, the Engine Control Module is typically found on the driver’s side of the engine compartment, near the air filter housing or firewall.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple key relearn procedure to sync with the new ECM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific procedure for your vehicle.
Verified Compatibility for Your Vehicle
This ECM, part number 12630457, is a direct replacement for a wide array of General Motors vehicles and is interchangeable with service numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 19210737. Please verify your vehicle is on the list below to ensure proper fitment.
Fits Models Including:
- Buick: Allure, LaCrosse, Lucerne, Rainier, Enclave
- Cadillac: CTS, DTS, SRX, STS, XLR
- Chevrolet: Colorado, Cobalt, HHR, Impala, Malibu, Monte Carlo, Trailblazer, Uplander
- GMC: Canyon, Envoy, Acadia
- Hummer: H3
- Isuzu: Ascender, i-290, i-370
- Pontiac: G6, Grand Prix, Montana, Pursuit, Solstice
- Saab: 9-7x
- Saturn: Aura, Ion, Outlook, Relay, Vue
Note: This is a partial list. This ECM fits many specific year/engine combinations for the models listed above from roughly 2005-2010. Please match your part number or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the module with the exact software and calibrations for your specific vehicle. This includes engine size, transmission type, and any other factory options. This process ensures the ECM works perfectly right out of the box.
Is any additional programming needed after installation?
No. This 2006 Montana Engine Control Module arrives fully programmed and ready for installation. The only step you may need to perform is a simple security relearn procedure, which does not require any special tools and can be done in your driveway.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (with codes like P0601, for example), then yes, this part will resolve the issue. However, if the light is on due to a separate failed sensor (like an oxygen sensor), that part will still need to be replaced.
What is the difference between an ECM and a PCM?
ECM (Engine Control Module) and PCM (Powertrain Control Module) are often used interchangeably. An ECM specifically controls engine functions, while a PCM controls both the engine and the transmission. For most modern vehicles like your Montana, this single module serves as the PCM, managing both systems.
Where is the ECM located on my 2006 Montana?
On the 2006 Pontiac Montana SV6, the Engine Control Module is located in the engine compartment, on the driver’s side. It’s typically attached to a bracket near the air cleaner assembly or on the firewall.