Is Your GM Truck, Van, or SUV Plagued by Engine Problems?
There’s nothing more frustrating than a vehicle you can’t rely on. If you’re dealing with a persistent check engine light, rough idling, stalling, or a no-start condition, the problem often points directly to a failing Engine Control Module (ECM). This isn’t just an inconvenience; it affects your vehicle’s performance, fuel economy, and safety. It’s time to stop chasing symptoms and fix the root cause with a reliable, straightforward solution.
Common Symptoms & Your Solution
A faulty ECM can manifest in numerous ways, leaving you stranded and facing expensive diagnostic bills. If you’re experiencing any of the following, this module is the definitive fix you’ve been looking for:
- Persistent Check Engine Light (CEL) with various DTCs
- Engine stalling or cutting out unexpectedly
- Noticeable loss of power and poor acceleration
- Reduced fuel efficiency
- Erratic or harsh transmission shifting
- Complete no-start or intermittent starting issues
This isn’t just a replacement part; it’s a complete solution. We provide a professionally prepared, Programmed 12633238 ECM that arrives ready for installation, eliminating the most difficult part of the repair process.
Features & Real-World Benefits
- ✔ Programmed to Your VIN: We flash the module with your vehicle’s specific VIN and the latest GM software before it ships. This means no expensive trip to the dealership for programming—saving you time and money.
- ✔ True Plug-and-Play Installation: Because the programming is done for you, installation is as simple as disconnecting the old module and connecting the new one. In most cases, no complicated relearn procedures are required.
- ✔ Restored Engine Performance: With fresh software and reliable hardware, your vehicle’s engine will operate exactly as the manufacturer intended, restoring lost power, smoothing out the idle, and improving throttle response.
- ✔ Guaranteed Compatibility: This module is a direct replacement for part numbers 12633238 and 12633055, ensuring a perfect fit and seamless communication with your vehicle’s other systems.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
Expert Insight: The Dealership vs. This Solution
As a technician with over 20 years of experience, I’ve seen countless vehicle owners get stuck in the cycle of diagnostics. Buying a blank ECM from a parts store or salvage yard seems cheaper upfront, but it’s only half the battle. You still have to get the vehicle—which may not even be running—to a dealership for expensive programming. That means tow bills, dealership labor rates, and days of downtime. Our process cuts through all of that. By sending you a fully Programmed 12633238 ECM, we deliver the complete, finished job right to your doorstep. It’s the smartest, most efficient way to get your truck or SUV back on the road and running perfectly.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will then program the module to match your vehicle’s exact specifications before we ship it to you. This ensures a perfect match and simple installation.
Is any additional programming or a ‘relearn’ procedure needed after I install it?
In most cases, no. Since the ECM comes pre-flashed to your VIN, it is designed to be a plug-and-play installation. Your vehicle should start and run correctly immediately. Some vehicles may require a simple security or CASE relearn, which can often be done without special tools.
How do I know for sure that my ECM is the problem?
Common signs of a failing ECM include a no-start condition where the engine cranks but won’t fire, multiple unrelated error codes, and intermittent stalling that can’t be traced to other sensors or components. While professional diagnosis is always recommended, these are strong indicators that the ECM is at fault.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your old ECM, then yes, this new module will resolve the issue. However, if the codes are being triggered by other faulty sensors or mechanical problems on the vehicle, those issues will still need to be addressed separately.
What if I order the wrong part?
Please use the detailed fitment list on this page to confirm compatibility with your make, model, and year. Matching the part number (12633238 or 12633055) from your original unit is the best way to ensure you are ordering the correct component for your vehicle.