Restore Peak Performance to Your Buick Rainier
Is your 2007 Buick Rainier suffering from frustrating and unpredictable engine problems? A faulty Engine Control Module (ECM) is often the hidden culprit behind issues like random stalling, poor fuel mileage, a persistent check engine light, or a complete no-start condition. As the central computer of your vehicle, a failing ECM can disrupt everything from fuel delivery to transmission shifting. This replacement Engine Control Module, part number 12630457, is the reliable, professional-grade solution to get your vehicle running smoothly again.
We take the guesswork and dealership hassle out of the equation. Before this module ships, we program it specifically to your vehicle using your VIN. This ensures it arrives with the latest GM software updates, which often correct underlying factory bugs and improve overall performance and drivability. You receive a part that is truly ready for installation, saving you time and the high cost of dealership programming.
From the Diagnostic Bay: A Tricky Diagnosis
I once had a 2007 Envoy (which uses this exact same ECM) come into the shop with a bizarre stalling issue that only happened on hot days after 20 minutes of driving. The owner had already replaced the crank sensor and a few other parts with no luck. After running diagnostics, I noticed the 5-volt reference signal to the sensors would intermittently drop out. This is a classic sign of an ECM failing internally due to heat soak. We installed a VIN-programmed module like this one, and the problem was solved permanently. It’s a reminder that chasing sensors can be a costly dead end when the computer itself is the root cause.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with no clear cause
- ✔ Engine stalls, stumbles, or misfires unpredictably
- ✔ Vehicle won’t start, or has trouble starting
- ✔ Noticeable decrease in fuel economy
- ✔ Poor or erratic automatic transmission shifting
- ✔ Communication error codes like U0100
- ✔ Internal module failure codes such as P0601 or P0606
A Straightforward Guide to Installation
Replacing the ECM on your Rainier is a manageable job for a confident DIYer. For the 2007 Buick Rainier with the 5.3L engine, the ECM is typically located on the driver’s side of the engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: Find the module on the driver’s side (LH) of the engine. It will have several large electrical connectors attached.
- Disconnect Connectors: Carefully release the locking tabs on each electrical harness connector 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 may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely re-fasten it.
- Reconnect Everything: Plug the harness connectors firmly back into the new module until they click into place. Reconnect the negative battery terminal.
- Security Relearn: In many cases, you may need to perform a simple security relearn procedure to sync the new ECM with your vehicle’s anti-theft system. 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 Vehicle Compatibility
This module is a direct replacement for service number 12630457 and is also interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 19210737. It fits a wide range of GM vehicles. Please verify your specific model and options below.
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
What do I need to do after I purchase?
After you place your order, you will need to send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. This ensures you get the correct software for your specific vehicle.
Is any additional programming required once I install it?
No, this ECM comes fully programmed to your VIN. However, you will likely need to perform a simple security relearn procedure, which can be done without any special tools and typically takes about 10-15 minutes.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM or an issue that the latest GM software addresses, then yes, this part should resolve it. It’s crucial to ensure your vehicle’s issues have been properly diagnosed as being ECM-related.
Where is the ECM located on my 2007 Buick Rainier?
On the 2007 Rainier with the 5.3L V8 engine, the Engine Control Module is located in the engine bay, on the driver’s side (LH side) near the firewall.
Is this a brand new part?
This is a high-quality, tested, and verified OEM replacement part that has been programmed with the newest software from GM. It is guaranteed to restore your vehicle’s functionality.