Restore Your Terraza’s Performance and Reliability
If your 2006 Buick Terraza is giving you headaches with a persistent check engine light, erratic performance, or even a no-start condition, the Engine Control Module (ECM) is often the culprit. As an automotive technician with over two decades of experience, I’ve seen firsthand how a failing ECM can create a cascade of frustrating, hard-to-diagnose problems. This isn’t just a part; it’s the central computer of your vehicle, and when it falters, everything from fuel economy to transmission shifting can be affected. This replacement 2006 Terraza Engine Control Module is the definitive solution to get your minivan running properly again.
We take the guesswork and extra cost out of the repair. Unlike getting a module from a junkyard or even the dealership, this unit arrives at your door fully programmed with the latest GM software updates. All we need is your vehicle’s VIN during checkout. This critical step ensures the ECM is perfectly matched to your Terraza’s specific configuration, making the installation process as simple as possible for both seasoned mechanics and DIY-ers.
Case Study: A Tricky Diagnosis
A few months back, a 2006 Chevy Uplander (which uses the same platform and ECM as the Terraza) was brought into the shop. The owner was at his wit’s end. He’d been chasing an intermittent stalling issue for weeks—it would die at stoplights with no warning and no specific trouble codes, just a generic U0100 ‘Lost Communication’ code every so often. Other shops had replaced sensors to no avail. After hooking up my diagnostic scanner and monitoring live data, I noticed the 5-volt reference signal would occasionally drop out just before a stall. This pointed directly to an internal failure in the ECM. We installed one of these VIN-programmed modules, and the problem was solved instantly. The customer was thrilled to have his reliable family vehicle back.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or misfiring unpredictably
- ✔ Vehicle won’t start, despite having power
- ✔ Poor fuel economy and engine performance
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication error codes, such as P0601, P0606, or U0100
- ✔ Failure to pass an emissions inspection
A Straightforward Guide to Installation
Replacing the 2006 Terraza Engine Control Module is a manageable job for someone with basic tools. This pre-programmed unit helps you avoid a trip to the dealer for software flashing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On the 2006 Buick Terraza, the Engine Control Module is typically found in the engine compartment on the driver’s side (LH side).
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the module. There are usually release tabs that need to be pressed or lifted. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect and Finalize: Securely plug the wiring harnesses back into the new module until they click. Reconnect the negative battery terminal. In some cases, a security relearn procedure may be required, which can typically be done without special tools (instructions are widely available online).
Verified Vehicle Compatibility
This ECM, part number 12602044, is a direct replacement for a wide range of General Motors vehicles. It is interchangeable with service numbers 12590032, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your model and specific options in the list below to ensure an exact fit.
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
Do I need to program or flash this module?
No. We handle the programming for you before shipment. It will arrive ready to install. Just provide your VIN when you place your order.
What information do you need from me?
We only need your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct, most current GM software for your vehicle’s specific options.
Is this a guaranteed fit for my 2006 Buick Terraza with the 3.9L engine?
Yes, this is the correct ECM for that application. It also fits a very wide range of other GM vehicles, as detailed in the compatibility list above.
My original part has a different number on it. Will this work?
It’s very likely. This ECM replaces several older service numbers, including 12590032, 12603530, and others listed above. As long as your vehicle is on the fitment list, this module is the correct replacement.
Will this fix my check engine light?
If the light is on because of an internal ECM failure (like with codes P0601 or P0606), then yes, this will resolve the issue. However, a check engine light can have many causes, so proper diagnosis is always recommended to ensure you’re replacing the right part.