Restore Peak Performance and Reliability to Your GM Vehicle
Is your truck or car plagued by a persistent check engine light, erratic idling, or a frustrating no-start condition? As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can wreak havoc on a vehicle’s performance and your peace of mind. The ECM is the brain of your engine, and when it starts to falter, you’ll notice. This isn’t just an inconvenience; it can lead to poor fuel economy, failed emissions tests, and even leave you stranded. This replacement Engine Control Module, part number 12602044, is the definitive solution to get your vehicle running like new again.
What sets this module apart is our professional programming service. Before this ECM ever leaves our facility, we flash it with the latest, most stable software updates directly from General Motors, all tailored specifically to your vehicle using your VIN. This eliminates the costly and time-consuming trip to the dealership for programming. You receive a component that is truly plug-and-play, ready to restore factory performance, shifting patterns, and fuel efficiency. This is the same process we use in our own repair shop to guarantee a successful and lasting repair for our customers.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2008 Envoy that came into my shop with a maddening intermittent stalling problem. The owner had already replaced the fuel pump and crankshaft position sensor with no luck. There were no hard codes, just a history of random communication loss (U-codes). After hooking up my scope, I monitored the 5-volt reference circuit from the ECM. Sure enough, during a long test drive, I saw the voltage dip erratically just before it would stall. The internal voltage regulator in the original ECM was failing under heat. We installed one of these VIN-programmed modules, performed the security relearn, and the problem was solved for good. It’s a classic example of how symptoms can be misleading, but the root cause often points back to the ECM.
Telltale Signs of a Failing ECM
If you’re experiencing any of the following, a faulty engine computer is a likely culprit. Don’t let these issues get worse; a failing ECM can sometimes cause damage to other components, like ignition coils or catalytic converters.
- ✔ Check Engine Light is illuminated with codes like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel economy.
- ✔ Rough or unpredictable engine idling.
- ✔ The vehicle stalls for no apparent reason.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass a state emissions inspection.
A Straightforward Guide to Installation
Replacing the ECM is a job most DIYers with basic tools can handle in under an hour. Our pre-programming service handles the most complex part for you. Just follow these general steps.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On most 2007-2009 Envoy models, the ECM is located on the driver’s side of the engine bay. On other compatible vehicles, it may be near the firewall or air cleaner housing. Refer to the fitment list for its typical location.
- Disconnect 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. Keep the hardware, as you’ll need it for the new unit.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- 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 security or anti-theft relearn procedure to recognize the new ECM. This can typically be done without special tools by cycling the key in the ignition. Instructions are readily available online for your specific model.
Will This Fit My Vehicle?
This ECM is a direct replacement for a wide range of GM vehicles. Please verify your make, model, year, and engine size against the list below. It is a direct replacement for service numbers: 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737.
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
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will receive an email with instructions on where to send your VIN. Alternatively, you can add your VIN to the ‘notes’ section during checkout. We cannot program and ship your module without it.
Is this part difficult to install?
No, the physical installation is straightforward for most people with basic hand tools. Because we pre-program the module, you do not need any special computer equipment. The only additional step may be a simple key-cycle security relearn.
What does ‘programming’ actually do?
Programming, or ‘flashing’, installs the correct software for your vehicle’s specific engine, transmission, and options. It ensures all components communicate correctly for optimal performance, fuel economy, and emissions, just as the factory intended.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606), then yes, this part will solve the problem. However, you should always diagnose the code properly to ensure there isn’t an issue with a sensor or wiring.
My old part number is slightly different, will this work?
Yes. This ECM, part number 12602044, is the correct service replacement for several older part numbers, including 12590032, 12603530, 12605843, and others listed above. It has been designated by GM as the proper interchangeable part.