Restore Peak Performance to Your Pontiac Montana
If you’re dealing with frustrating engine problems in your 2008 or 2009 Pontiac Montana—like a persistent check engine light, sudden stalling, rough idling, or a complete no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the central computer of your vehicle, a faulty ECM can disrupt everything from fuel delivery to transmission shifting. This replacement 2008-2009 Montana Engine Control Module is the reliable, straightforward solution to get your minivan back on the road and running like new.
Case Study: A Tricky Diagnosis
I remember a 2009 Montana that came into my shop a few years back. The owner had already replaced the fuel pump and a couple of sensors, but the van still had an intermittent stalling issue that was driving him crazy. No specific sensor codes were present, just a generic U0100 ‘Lost Communication with ECM’ code that would pop up occasionally. After verifying power and ground to the module, we knew the issue was internal. A failing ECM can send confusing signals, making you chase ghosts. We installed a VIN-programmed module just like this one, and the problem was solved instantly. It’s a perfect example of how the right part saves time, money, and headaches.
Is Your Montana Showing These Signs?
A failing ECM can manifest in various ways. As the vehicle’s brain, its failure impacts numerous systems. Here are the common indicators that your module needs replacement:
- âś” Check Engine Light is on with communication-related codes (e.g., U0100, P0601, P0606).
- âś” The engine cranks but refuses to start.
- âś” Unexplained drops in fuel economy.
- âś” Stalling or hesitation during acceleration.
- âś” Rough or erratic transmission shifting.
- âś” The vehicle enters a ‘limp mode’ with reduced power.
- âś” Other warning lights on the dash appear without a clear cause.
The Advantage of a VIN-Programmed Module
Forget expensive dealership visits and the need for specialized scan tools. We take the complexity out of the repair. When you purchase this 2008-2009 Montana Engine Control Module, we flash it with the latest official GM software updates using the VIN you provide. This ensures that the computer is perfectly matched to your vehicle’s specific configuration, including its engine, transmission, and factory options. It arrives at your door ready for a simple, plug-and-play installation.
A Straightforward Guide to Installation
This is a repair that a confident DIYer can handle in their own driveway. The ECM on the 2008-2009 Montana is located in the left-hand (driver’s side) of the engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: Open the hood and find the module on the driver’s side of the engine bay.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. There are typically release tabs that need to be pressed or lifted.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need it for the new unit.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle may need to idle for a few minutes to complete its internal relearn procedures.
Verified Vehicle Compatibility
This ECM, part number 12590032, is a direct replacement for a wide array of General Motors vehicles. It is interchangeable with service numbers 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your vehicle’s make, model, and year in the list below to ensure a perfect match.
COLORADO 08 Electronic Control Module; (RH firewall)
ENVOY 07-08 Electronic Control Module; 5.3L (LH engine)
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 19210737
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
XLR 09 Electronic Control Module; (RH front engine compartment), ID 12607096
AURA 08-09 Electronic Control Module; (RH firewall), 2.4L, w/hybrid
DTS 06 Electronic Control Module
DEVILLE 05 Electronic Control Module; (LH engine compartment), ID 12590032
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12605843
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
LACROSSE 08-09 Electronic Control Module; (lower air cleaner housing), 5.3L
STS 06 Electronic Control Module; (LH frame rail), 4.4L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12636660
UPLANDER 09 Electronic Control Module; (LH engine compartment), (3.9L)
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 19210737
SAAB 9-7X 07 Electronic Control Module; (LH engine), 8 cylinder
TRAILBLAZER 07 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 19210737
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 12607096
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
RAINIER 07 Electronic Control Module; (LH engine), 5.3L
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 12607096
CTS 06 Electronic Control Module; (RH engine compartment), V-Series, ID 12603530
STS 08 Electronic Control Module; (LH frame rail), 4.6L
G6 06 Electronic Control Module; (LH front engine compartment), ID 12603530
G6 08 Electronic Control Module; (LH front engine compartment), 3.6L
ION 06 Electronic Control Module; 2.4L (opt LE5)
MALIBU 06 Electronic Control Module; 3.9L
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 2.4L, w/hybrid
RELAY 06 Electronic Control Module; (LH engine compartment), 3.9L
VUE 08-09 Electronic Control Module; 2.4L, VIN Z (8th digit, opt LAT)
OUTLOOK 08 Electronic Control Module; (behind fan shroud)
SOLSTICE 06 Electronic Control Module; (LH front frame rail)
VUE 08 Electronic Control Module; 3.6L
VUE 09 Electronic Control Module; 3.6L, VIN 7 (8th digit, opt LY7)
ACADIA 07-08 Electronic Control Module; (behind fan shroud), ID 12607096 (ECM)
AURA 08-09 Electronic Control Module; (RH firewall), 3.6L
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 19210737
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12603530
GRAND PRIX 08 Electronic Control Module; (lower air cleaner box), 5.3L
HHR 06 Electronic Control Module; (LH rear engine compartment), 2.4L
STS 08 Electronic Control Module; (LH frame rail), 4.4L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12590032
ISUZU I-290 08 Electronic Control Module; (RH firewall)
LUCERNE 06 Electronic Control Module; (lower part of air cleaner box), 4.6L
MALIBU 09-10 Electronic Control Module; 2.4L, w/hybrid
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 19210737
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
MONTANA 06 Electronic Control Module; (LH engine compartment), (SV6), 3.9L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 19210737
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12636660
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12602044
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12607096
TRAILBLAZER 09 Electronic Control Module; (LH engine), 4.2L
CANYON 08 Electronic Control Module; (RH firewall)
COBALT 06 Electronic Control Module; (LH front engine compartment), 2.4L (VIN B, 8th digit, 4-146)
ISUZU I-370 08 Electronic Control Module; (RH firewall)
MALIBU 09 Electronic Control Module; 3.6L
SRX 08 Electronic Control Module; (LH engine compartment), (4.6L)
SAAB 9-7X 08 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
IMPALA 08-09 Electronic Control Module; (lower part of air cleaner box), 5.3L
XLR 06 Electronic Control Module; (RH front engine compartment), 4.4L
XLR 08 Electronic Control Module; (RH front engine compartment)
ENVOY 09 Electronic Control Module; (LH engine), 4.2L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12618163
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 19210737
MONTANA 08-09 Electronic Control Module; (LH engine compartment)
PURSUIT 06 Electronic Control Module; (LH front engine compartment), 2.4L
VUE 10 Electronic Control Module; 3.6L
ACADIA 08 Electronic Control Module; (behind fan shroud), ID 19210737 (PCM)
DTS 08 Electronic Control Module
TERRAZA 06 Electronic Control Module; (LH engine compartment), 3.9L
TRAILBLAZER 07 Electronic Control Module; (LH engine), 6.0L
SAAB 9-7X 08 Electronic Control Module; (LH engine), 6.0L
HUMMER H3 08 Electronic Control Module; (RH firewall)
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 3.6L
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 12607096
UPLANDER 06 Electronic Control Module; (LH engine compartment), 3.9L
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the ECM with the exact software calibration for your Montana’s specific options. This ensures perfect compatibility and performance, just like a module from the factory.
Is any additional programming needed after installation?
No. This module is sent to you fully programmed and ready for installation. In most cases, you will not need to perform any additional key relearn or security procedures, making it a true plug-and-play solution.
How do I send you my VIN?
After you complete your purchase, you will receive instructions on how to reply with your vehicle’s VIN. We cannot ship your module until we receive this information.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (common codes include P0601-P0606 or communication errors), then this part will resolve the issue. We always recommend a proper diagnosis to confirm the ECM is the point of failure before ordering.