Restore Peak Performance to Your GM Vehicle with a VIN-Programmed ECM
If you’re dealing with a frustrating check engine light, poor fuel economy, or a vehicle that just won’t start, a failing Engine Control Module (ECM) is often the culprit. As the ‘brain’ of your vehicle’s engine, the ECM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that are difficult to diagnose. This replacement ECM, part number 12633238, is the definitive solution for your 2010-2015 Express 2500 Van and a wide range of other GM vehicles. Forget expensive dealership visits and complex programming tools. We handle the hard part for you.
We take your vehicle’s specific VIN and program this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and function right out of the box. It’s not just a replacement part; it’s a restoration of your vehicle’s core operational logic, designed to fix those persistent electronic gremlins and get you back on the road with confidence.
From the Diagnostic Bay: The Ghost in the Machine
I had a 2012 Express 2500 work van in my shop that was a real head-scratcher. The owner reported intermittent stalling and a flashing check engine light, but the codes were all over the place—random misfires, O2 sensor faults, and even a transmission communication code (U0100). We chased wires and replaced sensors for two days with no luck. The symptoms would disappear, only to return a day later. On a hunch, I checked the ECM’s part number. Knowing that internal board failures can cause these ‘ghost’ issues, we ordered one of these pre-programmed modules. After a simple 15-minute install, every single code vanished and the van ran perfectly. The original ECM had an internal fault that was corrupting the data stream, making other components look guilty. This case solidified for me how a reliable, correctly programmed 2010-2015 Express 2500 ECM isn’t just a part—it’s a powerful diagnostic solution.
Is Your GM Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for these common signs:
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel efficiency.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Communication error codes, such as U0100.
- ✔ Internal module failure codes, like P0601, P0605, or P0606.
- ✔ Transmission shifting issues or getting stuck in gear.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
Installing your new 2010-2015 Express 2500 ECM is a simple process that most DIYers can complete with basic hand tools. While the exact location varies slightly by model (see fitment list), the steps are generally the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all systems are fully powered down.
- Locate the ECM: On Express/Savana vans, it’s typically in the LH rear of the engine compartment. On trucks and SUVs like the Silverado or Tahoe, it’s usually on the LH front side of the engine compartment.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you may need it for the new installation.
- Install the New ECM: Mount the new module securely onto the bracket and re-install the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM, ensuring they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In some cases, a simple security relearn procedure is needed. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle’s manual will have the specific steps.
Verified Vehicle Compatibility List
This module, interchangeable with part numbers 12633238 and 12633055, is a direct-fit replacement for a massive range of GM cars, trucks, and vans. Please verify your vehicle and options below.
CAMARO 10-15 (6.2L, 7.0L)
CAPRICE 11-17 (6.0L)
CORVETTE 10-13 (6.2L, 7.0L)
ESCALADE / ESV / EXT 10-14
EXPRESS 1500 VAN 10-14 (5.3L)
EXPRESS 2500 VAN 10-15 (4.8L, 6.0L)
EXPRESS 3500 VAN 10-15 (4.8L, 6.0L)
SAVANA 1500 VAN 10-14 (5.3L)
SAVANA 2500 VAN 10-15 (4.8L, 6.0L)
SAVANA 3500 VAN 10-15 (4.8L, 6.0L)
SIERRA 1500 PICKUP 10-13 (4.8L, 5.3L, 6.2L)
SIERRA 2500 PICKUP 10 (6.0L)
SIERRA 3500 PICKUP 10 (6.0L)
SIERRA DENALI 10-13
SILVERADO 1500 PICKUP 10-13 (4.8L, 5.3L, 6.2L)
SILVERADO 2500 PICKUP 10 (6.0L)
SILVERADO 3500 PICKUP 10 (6.0L)
SS CAPRICE 14-17
SUBURBAN 1500 10-14
SUBURBAN 2500 10-13
TAHOE 10-14 (w/o hybrid)
YUKON 10-14 (w/o hybrid)
YUKON XL 1500 10-14
YUKON XL 2500 10-13
Frequently Asked Questions
How does the VIN programming process work?
It’s simple! After you complete your purchase, you will provide us with your vehicle’s 17-digit VIN. We use this number to access the latest official GM software for your specific model, engine, and options, and then flash it onto the module before shipping.
Is this a true plug-and-play part?
Yes, for over 95% of vehicles. Because it arrives pre-programmed to your VIN, you will not need a special scan tool for setup. In some rare cases, a simple ‘security relearn’ procedure may be required, which you can do yourself in minutes with just your key.
Will this fix my ‘No Start’ problem?
If the no-start condition is caused by a faulty ECM, then yes, this will resolve the issue. Common signs of an ECM-related no-start include the engine cranking but not firing, or a complete lack of communication with a scan tool.
Where do I find my VIN?
Your VIN can be found on your vehicle’s registration, your insurance card, or on the vehicle itself. Look for a small metal plate on the driver’s side of the dashboard (visible through the windshield) or on the sticker inside the driver’s door jamb.
Does this ECM fit other part numbers?
Yes, this module is a direct replacement for both part number 12633238 and 12633055. If your original module has either of these numbers, this part is guaranteed to be compatible.