Restore Peak Performance to Your GM Vehicle
Is your 2018 Savana 2500 van, Silverado, or other compatible GM vehicle running rough, stalling, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s most critical functions. A faulty ECM can lead to poor fuel economy, failed emissions tests, and even a no-start condition, leaving you stranded. This genuine GM ECM, part number 12704475, is the definitive solution to restore your vehicle’s factory performance, reliability, and efficiency.
Unlike generic modules that require expensive and complicated programming at a dealership, this unit arrives at your door pre-programmed to your specific vehicle. We use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication between the ECM and all other vehicle systems, providing a true plug-and-play solution that gets you back on the road faster.
From the Diagnostic Bay
We had a 2018 Express work van come in with a bizarre, intermittent stalling issue. No consistent codes, just a P0606 (Internal Control Module Processor Error) that would pop up randomly. The owner had already replaced the fuel pump and a few sensors with no luck. After confirming stable power and ground to the ECM, we knew the internal processor was the culprit. We ordered a VIN-programmed module like this one. After installation and a quick security relearn, the van ran perfectly. The key was getting a module with the correct, updated calibration for that specific VIN, which prevented any further communication conflicts. It saved the owner from endless guesswork and costly, unnecessary repairs.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling or misfiring unexpectedly
- ✔ Vehicle refuses to start (no-crank or crank-no-start)
- ✔ Noticeable decrease in fuel efficiency
- ✔ Poor acceleration and overall engine performance
- ✔ Shifting problems in automatic transmissions
- ✔ Communication error codes with diagnostic scan tools
Why Choose Our Programmed 2018 Savana 2500 ECM?
This isn’t just a replacement part; it’s a comprehensive solution. The ECM is the brain of your vehicle, controlling everything from fuel injection and ignition timing to emissions systems and transmission shifting. Our process ensures this brain is perfectly matched to your vehicle’s body. By providing your VIN, you guarantee that the module you receive has the exact software and calibrations your vehicle was designed with from the factory, plus any subsequent updates from GM for improved performance and longevity. This eliminates compatibility issues that plague un-programmed or incorrectly programmed modules.
Important Installation Note
While we handle the primary programming, your vehicle’s anti-theft system (Pass-Key, VTD) needs to recognize the new ECM. In many cases, the vehicle will start and run immediately. However, if the vehicle does not start after installation, a security relearn procedure is required. This synchronizes the new ECM with your vehicle’s security components. This procedure must be performed by a qualified technician using a GM-specific diagnostic tool like Tis2web or Techline Connect. Other potential relearns, such as crankshaft position variation or injector flow rate programming, may also be necessary depending on your specific vehicle and its condition.
Guaranteed Fitment & Compatibility
This Engine Control Module is a direct replacement for several part numbers, ensuring broad compatibility across the GM lineup. If your original module has one of the following numbers, this part is the correct replacement for you:
- 12704475
- 12692069
- 12680656
- 12686383
- 12688528
It is designed to fit a wide range of 2018-2019 GM trucks, vans, and cars, including but not limited to:
- 2018 Chevrolet Silverado 1500 & GMC Sierra 1500
- 2018 Chevrolet Express 2500/3500 Van (4.3L)
- 2018 GMC Savana 2500/3500 Van (4.3L)
- 2018 Chevrolet Suburban 1500 & Tahoe
- 2018 GMC Yukon & Yukon XL 1500
- 2018 Cadillac Escalade & Escalade ESV
- 2018-2019 Chevrolet Corvette
- 2018 Cadillac XTS (3.6L)
Please verify the part number on your original module to ensure a perfect match.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. We handle the programming for you before shipment. Simply provide your 17-digit VIN during or after checkout, and we will flash the module with the latest GM software specific to your vehicle.
What is a security relearn?
A security relearn is a procedure that syncs the new ECM to your vehicle’s anti-theft system. If your vehicle doesn’t start after installation, this procedure is required and must be done with a GM-specific diagnostic tool. This is a standard step when replacing security-related components.
Where is the ECM located on my 2018 Savana 2500 Van?
On the 2018 Savana and Express vans, the ECM is typically located in the engine compartment, on the left-hand (driver’s side) rear area. Always disconnect the battery before attempting to remove or install the module.
What information do you need from me?
We only need your vehicle’s 17-digit VIN to program the module correctly. You can provide this in the notes section at checkout or send it to us in a message after your purchase.
Will this fix my check engine light?
If the check engine light and other symptoms are caused by a faulty ECM, this part is the correct solution. We always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the point of failure before ordering.