Restore Peak Performance and Reliability to Your GM Vehicle
Is your Cadillac, Chevy, or GMC truck acting up? Unexplained stalling, a persistent Check Engine Light, or a complete no-start condition can often point directly to a failing Engine Control Module (ECM). As the brain of your vehicle’s engine, a faulty ECM can cause a cascade of frustrating and hard-to-diagnose issues. I’ve seen it hundreds of times in my 20+ years of diagnostics: a perfectly good engine held hostage by a failing computer. This isn’t just an inconvenience; it’s a critical failure that compromises performance and safety.
This is your direct-fit solution. We offer a genuine replacement 2017 ATS Engine Control Module, which also fits a wide range of other GM vehicles. The best part? We take the biggest headache out of the equation. Before this module ever leaves our facility, we program it with the latest GM software updates using the VIN you provide. This ensures that when it arrives, it’s calibrated specifically for your vehicle’s engine, transmission, and factory options, saving you a costly and time-consuming trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2017 Sierra 1500 with an intermittent no-start and a U0100 ‘Lost Communication with ECM’ code that would pop up randomly. We checked all the basics—power, grounds, and CAN bus wiring—and everything tested fine. The issue was maddeningly inconsistent. After swapping in a test module, the problem vanished. The original ECM had an internal failure that only occurred under specific temperature conditions. Instead of spending hours trying to get a blank module programmed at the dealer, the shop ordered one of our VIN-programmed units. It arrived the next day, they performed the quick security relearn, and the truck was back on the road. This is the kind of efficiency that keeps shops profitable and customers happy.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer may be the culprit:
- ✔ Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- ✔ Vehicle refuses to start or starts and immediately stalls.
- ✔ Noticeable drop in fuel economy for no apparent reason.
- ✔ Engine misfires, runs rough, or hesitates during acceleration.
- ✔ Automatic transmission shifts erratically or harshly.
- ✔ Inconsistent or non-functional electronic throttle control.
A Straightforward Guide to Installation
Installing your pre-programmed 2017 ATS Engine Control Module is a manageable job for a confident DIYer or a quick task for any professional technician. Follow these steps carefully for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On most listed models, the ECM is found in the engine compartment, typically on the driver’s side (LH). On the Corvette, it’s located under the dash on the passenger’s side (RH cowl). Refer to your vehicle’s service manual for the exact location.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old ECM. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket and reconnect all wiring harnesses. Ensure they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- CRITICAL Final Step – Security Relearn: In many cases, the vehicle will not start until a Vehicle Theft Deterrent (VTD) relearn is performed. This procedure syncs the new ECM with your vehicle’s security system. This requires a tool with GM software access, such as Tis2web or Techline Connect. This is the responsibility of the installer.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Variation Relearn or injector flow rate programming may be required to achieve optimal performance.
Verified Vehicle Compatibility
This ECM is a guaranteed fit for the following vehicles and part numbers. Please verify your original part number is on this list: 12692068, 12704476, 12686382, 12674052, 12674472, 12678815.
- Cadillac ATS: 2017 (3.6L, VIN Y, LF4)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8, LF3)
- Cadillac Escalade / ESV: 2017
- Cadillac XTS: 2017 (3.6L, VIN 8, LF3)
- Chevrolet Corvette: 2017
- Chevrolet Silverado 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- Chevrolet Suburban 1500: 2017
- Chevrolet Tahoe: 2017
- GMC Sierra 1500 / Denali 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- GMC Yukon / Yukon XL 1500: 2017
What do I need to do after I purchase?
What do I need to do after I purchase?
After you complete your purchase, you MUST send us your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship your ECM without it. Please double-check the VIN for accuracy before sending.
Will my car start immediately after installation?
Often, no. Because the ECM is a core part of the anti-theft system, a security relearn procedure is almost always required. This must be done on the vehicle using a GM-compatible scan tool like Tis2web/Techline Connect. This is a standard procedure for ECM replacement.
Can I do the security relearn myself?
If you are a DIYer without access to professional GM diagnostic software, you will likely need to have the vehicle towed to a qualified repair shop to perform the security relearn. Most professional shops can complete this procedure quickly.
Is this a brand new part?
This is a high-quality, tested, and verified used OEM part. We ensure it meets or exceeds factory specifications and program it with the latest software for your VIN, providing a reliable and cost-effective alternative to a new dealer part.
Do you offer a warranty?
Yes, all of our pre-programmed modules come with a standard warranty. Please see the warranty tab on this listing for complete details and duration.