Is Your Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
The Engine Control Module (ECM), often called the engine’s brain, is the central command center for your vehicle’s performance, fuel economy, and emissions. When it begins to fail, it can cause a cascade of confusing and frustrating problems, from poor acceleration and random stalling to a complete no-start condition. If you’re experiencing these issues with your 2009 Cadillac SRX or another compatible GM vehicle, a faulty ECM is a likely culprit. This direct-replacement Engine Control Module, part number 12636659, is the definitive solution to restore your vehicle’s operational integrity and get you back on the road with confidence.
Symptoms of a Failing Engine Control Module
- ✔ Check Engine Light: The most common indicator, often with codes related to internal module failure, sensor reference voltage, or communication errors (U-codes).
- ✔ Engine Stalling or Misfiring: The ECM may intermittently fail to control spark or fuel injection, leading to rough running, stalling, or hesitation.
- ✔ No-Start Condition: A completely failed module will not be able to activate the fuel pump, injectors, or ignition coils, preventing the engine from starting.
- ✔ Poor Fuel Economy: Incorrect sensor readings or faulty calculations within the ECM can lead to an overly rich or lean fuel mixture, drastically reducing MPG.
- ✔ Inconsistent Performance: You might notice erratic shifting from the automatic transmission, poor throttle response, or a general lack of power as the ECM struggles to manage engine parameters.
- ✔ Communication Issues: A diagnostic scan tool may be unable to communicate with the ECM, a clear sign of an internal hardware or software problem.
The Plug-and-Play Solution: A Pre-Programmed 2009 SRX Engine Control Module
One of the biggest hurdles in replacing a modern ECM is the need for specialized, dealer-level programming. Without it, the new module won’t recognize your vehicle’s specific configuration, security system, or options. This typically means towing your vehicle to a dealership and paying hundreds in programming fees. We eliminate that step entirely. When you purchase this 2009 SRX Engine Control Module, we use the Vehicle Identification Number (VIN) you provide to flash the unit with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it is ready for installation, creating a true plug-and-play experience.
Simple Installation Process
While professional installation is always recommended, replacing the ECM is often straightforward for a seasoned DIYer. On the 2009 SRX, the module is typically located in the left-hand (driver’s side) engine compartment. The process generally involves:
- Disconnecting the Battery: This is a critical first step for safety and to prevent electrical damage.
- Locating and Accessing the ECM: Remove any covers or components necessary to reach the module.
- Disconnecting Electrical Connectors: Carefully unlatch and remove the wiring harness connectors. Inspect them for any corrosion or damage.
- Removing the Old Module: Unbolt the old ECM from its mounting bracket.
- Installing the New Module: Mount the new, pre-programmed ECM, reconnect the wiring harnesses, and re-install any covers.
- Reconnecting the Battery: Once everything is secure, reconnect the battery terminals.
In some cases, a simple security relearn procedure may be required after installation. This can often be done without special tools and involves a sequence of key cycles. Instructions are widely available online or in service manuals for your specific model.
Guaranteed Compatibility and Fitment
This ECM is a direct replacement for a wide range of General Motors vehicles and is interchangeable with multiple service numbers, ensuring you get the right part. Please verify your vehicle is on the list below. This unit replaces the following part numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
This module is confirmed to fit the following vehicles:
- Cadillac CTS (2009, 6.2L)
- Cadillac DTS (2009-2011)
- Cadillac SRX (2009, 4.6L)
- Cadillac STS (2009-2010, 4.4L, 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)
Don’t let a faulty computer keep your vehicle sidelined. Order this pre-programmed 2009 SRX Engine Control Module today and restore the performance, reliability, and efficiency you expect from your vehicle.
Frequently Asked Questions
Do I need to have this ECM programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN at checkout, and the module will arrive with the latest GM software, ready for installation.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific car. It allows us to access the exact factory software, security information, and option configuration for your vehicle, ensuring the programmed ECM is a perfect match.
Where is the ECM located on a 2009 Cadillac SRX?
On the 2009 SRX with the 4.6L engine, the Engine Control Module is typically found in the engine compartment on the driver’s side (LH side).
Will I need to perform any other procedures after installation?
In many cases, no. However, some GM vehicles may require a security relearn procedure (also known as a Passlock or anti-theft relearn) to sync the new ECM with the ignition keys. This procedure can usually be done without any special tools.
Is this part compatible with other part numbers?
Yes, this module is a direct replacement for several service numbers, including 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.