Is Your Cadillac SRX Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience, I’ve seen countless vehicles roll into the shop with frustrating, hard-to-diagnose issues. Symptoms like erratic idling, poor fuel economy, a no-start condition, or a dashboard full of warning lights can often be traced back to one single component: a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it starts to fail, it can create a cascade of problems that can seem unrelated and confusing.
Just last month, a 2009 SRX with the 4.6L was towed to my shop. The owner had already replaced multiple sensors and the spark plugs, but the random stalling and persistent communication codes (U-codes) pointed straight to the ECM. A faulty module can mimic a dozen other problems, which is why a proper diagnosis is key. In that case, once we swapped in a correctly programmed module, it ran perfectly, saving the customer from further expensive and unnecessary repairs.
The Direct-Fit Solution: Pre-Programmed for Your SRX
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and the expensive dealership trip out of the equation. When you order, simply provide us with your vehicle’s VIN, and our experts will program this ECM with the latest, most stable software updates directly from GM. It will arrive at your door tailored specifically for your 2009 Cadillac SRX.
- โ VIN-Specific Programming: We flash the module to your exact vehicle, ensuring all systems communicate perfectly.
- โ No Dealer Required: This module is plug-and-play. Once installed, you will only need to perform the key relearn procedure, which you can do yourself.
- โ Restores Original Performance: Corrects issues caused by a faulty computer, from fuel mixture and spark timing to transmission shifting.
- โ Latest GM Software: Loaded with the newest updates to improve drivability and efficiency over the original programming.
Expert Pro Tip: Check for External Causes
Before installing your new ECM, take a moment to inspect the area around the old module. On the 2009 SRX, the ECM is located in the left-hand (driver’s side) engine compartment. I’ve seen failures caused by water intrusion from a clogged cowl drain or from a damaged wiring harness that has rubbed against a sharp edge. Cleaning the connector pins with a dedicated electronics cleaner and ensuring the harness is secure can prevent damage to your new module and ensure a long service life.
Easy Installation for Your 2009 SRX Engine Module
You can perform this replacement with basic hand tools right in your driveway. Follow these steps for a successful installation:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On your 2009 SRX, the Engine Control Module is found in the engine compartment on the driver’s side.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never pull on the wires themselves. Inspect the connectors for any signs of corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware that secures the ECM to its bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform the vehicle’s anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine. Your owner’s manual will have the specific steps.
Guaranteed Compatibility
This module is a direct replacement for part number 12639300 and is also interchangeable with the following GM service numbers: 12636659, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
Verified Vehicle Fitment List
While this listing is focused on the SRX, this versatile module is also the correct component for a wide range of GM vehicles. Please confirm your model and engine option below:
- CADILLAC CTS 2009 (6.2L)
- CADILLAC DTS 2009-2011
- CADILLAC SRX 2009 (4.6L)
- CADILLAC STS 2009 (4.4L, 4.6L)
- CADILLAC STS 2010 (4.6L)
- CADILLAC XLR 2009
- CHEVROLET COLORADO 2009-2012 (2.9L, 3.7L)
- CHEVROLET CORVETTE 2009 (ZR1)
- CHEVROLET TRAILBLAZER 2009 (6.0L)
- GMC CANYON 2009-2012 (2.9L, 3.7L)
- GMC ENVOY 2009 (5.3L)
- HUMMER H3 2009-2010 (3.7L)
- BUICK LUCERNE 2009-2011 (4.6L)
- SAAB 9-7X 2009