Restore Peak Performance to Your Cadillac SRX
If you’re dealing with frustrating engine problems in your 2009 Cadillac SRX—like erratic idling, poor fuel economy, a persistent check engine light, or even a no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the central computer of your vehicle, the ECM manages everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire system suffers. This direct-replacement 2009 SRX Engine Module, part number 12636659, is the definitive solution to get your luxury SUV running smoothly again.
Over my 20+ years in automotive diagnostics, I’ve seen countless vehicle owners and even professional shops chase down phantom issues, replacing sensors and fuel pumps, only to find the root cause was the ECM all along. We eliminate the guesswork and the costly dealership visits. When you order from us, you provide your vehicle’s VIN, and we flash the module with the latest, most stable GM factory software specifically for your SRX. It arrives at your door ready for a straightforward, plug-and-play installation, saving you hundreds in programming fees.
Case Study: A Tricky Diagnosis
A few months back, a 2009 Cadillac SRX with the 4.6L V8 was brought into a partner shop. The owner complained of intermittent stalling at stoplights and a hesitation during acceleration. They had already replaced the throttle body and a camshaft position sensor with no improvement. The scan tool showed a generic P0606 (ECM Processor Fault) code that would come and go. After confirming solid power and ground connections to the module, we suspected an internal ECM failure. We supplied a VIN-programmed module, and the shop performed the swap in under 30 minutes. The SRX immediately ran perfectly, and the stalling and hesitation issues were completely gone. It’s a classic example of how a faulty 2009 SRX Engine Module can mimic other component failures.
Is Your Cadillac Exhibiting These ECM Failure Signs?
A failing engine computer can manifest in various ways. If you’re noticing any of the following, it’s a strong indicator that your ECM needs attention.
- ✔ Unexplained Check Engine Light illumination.
- ✔ Common diagnostic trouble codes (DTCs) like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Rough or unpredictable engine idling.
- ✔ The vehicle stalls for no apparent reason.
- ✔ Poor acceleration or loss of power.
- ✔ Automatic transmission shifting issues.
Your Straightforward Installation Guide
Installing your new 2009 SRX Engine Module is a manageable job for a DIY enthusiast or any professional mechanic. No special programming tools are required.
- Safety First: 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 2009 SRX, the Engine Control Module is typically found in the engine compartment on the driver’s side (LH side).
- Disconnect Connectors: Carefully release the locking tabs and unplug the electrical wiring harnesses from the old module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in place and tighten the mounting bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which 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. Start the engine and enjoy restored performance.
Verified Compatibility for Your Vehicle
This module is a direct replacement for service number 12636659 and is also interchangeable with 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. It is guaranteed to fit the following vehicles:
- ✔ 2009 Cadillac SRX (4.6L)
- ✔ 2009 Cadillac STS (4.4L, 4.6L)
- ✔ 2010 Cadillac STS (4.6L)
- ✔ 2009 Cadillac CTS (6.2L)
- ✔ 2009 Cadillac XLR (ID 12636659 or 12625453)
- ✔ 2009-2011 Cadillac DTS
- ✔ 2009-2011 Buick Lucerne (4.6L)
- ✔ 2009 Chevrolet Corvette (ZR1)
- ✔ 2009 Chevrolet Trailblazer (6.0L)
- ✔ 2009-2012 Chevrolet Colorado (2.9L, 3.7L)
- ✔ 2009 GMC Envoy (5.3L)
- ✔ 2009-2012 GMC Canyon (2.9L, 3.7L)
- ✔ 2009-2010 Hummer H3 (3.7L)
- ✔ 2009 Saab 9-7x
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready to install with the latest GM software for your specific vehicle.
What is a VIN and where do I find it?
VIN stands for Vehicle Identification Number. It’s a unique 17-digit code for your car. You can typically find it on a small plate on the driver’s side dashboard (visible through the windshield) or on the sticker inside the driver’s side door jamb.
Where is the ECM on a 2009 Cadillac SRX?
The Engine Control Module on the 2009 SRX with the 4.6L engine is located in the engine compartment, on the driver’s side (left-hand side).
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. It’s crucial to ensure the ECM is the actual problem before ordering, as this part will not fix issues caused by other faulty sensors or mechanical components.
What if my original part number is different?
This module is a direct replacement for a wide range of GM service numbers. Please check the list of interchangeable part numbers provided in the description. As long as your original number is on that list, this module will work perfectly for your vehicle.