Restore Peak Performance to Your Buick Rainier
Is your 2007 Buick Rainier suffering from baffling engine problems? Unexplained stalling, rough idling, a persistent Check Engine Light, or even a frustrating no-start condition can often be traced back to a failing Engine Control Module (ECM). As the brain of your vehicle’s engine, a faulty ECM can disrupt everything from fuel delivery and spark timing to transmission shifting. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s reliability and safety.
This replacement Engine Control Module is the definitive solution to get your vehicle running right again. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest GM software updates, ready for a straightforward installation. You get a reliable, cost-effective fix without the expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I recently worked with a customer who owned a 2007 Trailblazer with the 5.3L V8—a vehicle that shares this exact ECM with the Rainier. He had spent months chasing what he thought was a fuel delivery problem. He replaced the fuel pump, injectors, and multiple sensors, but the intermittent stalling and poor fuel economy persisted. After he finally brought it to the shop, we hooked up our professional scan tool. While there were no ‘smoking gun’ codes, we noticed erratic data from several sensors simultaneously. This is a classic sign that the central processor—the ECM—is failing. We installed a VIN-programmed 2007 Rainier Engine Control Module, and the truck ran perfectly. It’s a prime example of how a faulty ECM can send you down an expensive rabbit hole of unnecessary repairs.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need:
- âś” Persistent Check Engine Light (CEL)
- âś” Engine stalling or shutting off while driving
- âś” No-start or hard-start conditions
- âś” Noticeable decrease in fuel efficiency
- âś” Rough or erratic engine idle
- âś” Poor acceleration or loss of power
- âś” Transmission shifting problems
- âś” Communication error codes like U0100 or internal module fault codes like P0601 or P0606
Your Straightforward ECM Installation Guide
Installing your pre-programmed ECM is a manageable job for a confident DIYer. Follow these steps carefully to ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On the 2007 Buick Rainier, the ECM is typically located on the driver’s side of the engine compartment, attached to the inner fender or near the firewall.
- Disconnect the Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- 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 onto the bracket and secure it. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle may need to complete a drive cycle for all systems to fully initialize.
Verified Vehicle Compatibility
This ECM is a direct replacement for service number 12630457 and is also interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 19210737. It is guaranteed to fit the following vehicles and options:
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) is essential for us to program the ECM with the exact software and calibrations for your Rainier’s specific options, including engine, transmission, and emissions equipment. This ensures perfect compatibility and function right out of the box.
Is any additional programming required after installation?
No. Our service includes programming the module before we ship it. In most cases, it is a plug-and-play installation. However, some vehicles may require a security relearn procedure (often called a Passlock or anti-theft relearn), which is a simple process you can do yourself with just the ignition key. Instructions are widely available online or we can help guide you.
How do I find my original part number?
The service number is printed on a sticker on your original ECM. While it’s helpful to match it, our VIN programming service ensures compatibility even if your number is slightly different from the ones listed, as long as your vehicle is on the compatibility list.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal failure of the ECM (like codes P0601-P0606) or an ECM-related sensor circuit fault, then yes, this replacement module will resolve the issue. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.
What if I have questions during installation?
We are a team of experienced automotive professionals. If you encounter an issue or have a question, you can contact us for expert support. We’re here to help ensure your repair is successful.