Restore Peak Performance to Your Vehicle’s Powertrain
Dealing with a frustrating check engine light, poor fuel economy, or an engine that just won’t start? The Engine Control Module (ECM) is the brain of your vehicle, and when it starts to fail, it can cause a cascade of confusing and costly problems. This isn’t just a replacement part; it’s a complete, reliable solution. We offer a professionally prepared 2008 STS Engine Control Module that arrives at your door programmed with the latest GM software, specifically matched to your vehicle’s VIN. This eliminates the need for expensive dealership programming, saving you time and money.
As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can mimic dozens of other issues. Drivers often spend hundreds chasing sensor or wiring problems when the root cause is the computer itself. This module is a direct-fit replacement for a wide range of GM vehicles, ensuring that once installed, your engine’s fuel mixture, ignition timing, and transmission shifting are restored to factory specifications. You’re not just buying a part; you’re buying peace of mind and restoring the dependable performance you expect from your car.
Case Study: The Intermittent Stall
A customer brought in a 2008 Cadillac STS with a problem that had stumped two other shops. The car would run perfectly for days, then suddenly stall at a red light or hesitate badly during acceleration. There were no consistent trouble codes, just a history of random communication errors (U0100). After confirming the power and ground circuits to the ECM were solid, I suspected an internal failure in the module itself, likely triggered by heat soak. We installed one of our VIN-programmed modules, and the problem vanished instantly. The customer was thrilled to have their car back, running reliably without the constant fear of a breakdown.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, a faulty module could be the culprit:
- ✔ Check Engine Light is illuminated with codes like P0601, P0606 (Internal Processor Failure) or U-series communication codes.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drop in fuel efficiency.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Noticeable loss of power and poor acceleration.
- ✔ Failure to pass an emissions inspection.
A Straightforward Guide to Installation
For the confident DIYer or professional mechanic, installing this module is a manageable job. On a 2008 Cadillac STS, the ECM is typically located on the driver’s side frame rail. Always consult a service manual for your specific vehicle’s location.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old ECM: Find the existing Engine Control Module on your vehicle.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure. This allows your vehicle’s anti-theft system to recognize the new ECM. This procedure typically takes about 30 minutes and does not require special tools.
Guaranteed Vehicle Compatibility
This module, part number 12590032, is a direct replacement for a wide array of GM, Isuzu, and Saab vehicles. It is interchangeable with service numbers 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your vehicle is on the list below. If you have any questions, our team is here to help you confirm the correct fitment.
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 for programming?
After you complete your purchase, you will receive instructions to reply with your 17-digit Vehicle Identification Number (VIN). We cannot ship your module until we receive this information.
Is this part truly plug-and-play?
Almost. It comes fully programmed to your VIN. The only remaining step after physical installation is a simple security relearn procedure that pairs the module to your vehicle’s anti-theft system. This process involves a series of key turns and does not require any special scan tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0600-P0606) or related communication issues, this module is the correct fix. It is essential to properly diagnose the vehicle first, as the light can be triggered by many other components like sensors or wiring.
My original part number is different. Will this still work?
Yes, this module is a direct replacement for several service numbers, including 12602044, 12603530, and others listed in the description. As long as your vehicle is on the compatibility list, this module will function correctly.
Do I need to send my old ECM back?
No core charge or return is required for this particular module. You can keep or recycle your old part.