Restore Peak Performance and Reliability to Your GM Vehicle
When your vehicle’s Engine Control Module (ECM) starts to fail, it can cause a host of frustrating and complex problems, from a simple check engine light to a vehicle that won’t start at all. As the central computer for your engine, its proper function is non-negotiable. This direct-fit replacement 2017 Escalade Engine Control Module, part number 12686382, is the definitive solution to get your truck or SUV running smoothly again. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific VIN with the latest factory software from GM before it ever leaves our facility.
A Technician’s Notebook: The No-Start That Wasn’t the Battery
I once had a 2017 Sierra 1500 towed into my bay with a classic no-crank, no-start condition. The owner had already replaced the battery and checked the starter, but nothing worked. The dashboard lit up, but turning the key did nothing. After connecting my scan tool, I found a series of U-codes (communication errors) and a P0606 ‘ECM Processor Fault’ code. This told me the issue wasn’t mechanical; the vehicle’s brain was offline. The ECM had an internal failure, preventing it from communicating with the security system and other modules. Installing a VIN-programmed ECM like this one restored communication instantly. After a quick VTD relearn, the truck fired right up, saving the customer a tow to the dealership and hundreds in diagnostic and programming fees.
Is Your GM Vehicle Exhibiting These Symptoms?
A failing ECM can manifest in various ways. If you’re experiencing any of the following, it might be time for a replacement:
- ✔ Complete no-start or intermittent starting issues.
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or other communication faults (U-codes).
- ✔ Poor engine performance, hesitation, or stalling.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Seeming electrical gremlins that are hard to diagnose.
Your Straightforward Installation Guide
While professional installation is always an option, a proficient DIYer can handle this job. The most critical part is the final security relearn procedure.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On most compatible trucks and SUVs like the Tahoe, Sierra, and Escalade, the ECM is found in the engine compartment, typically on the driver’s side near the firewall or fender. On the Corvette, it’s under the dash on the passenger side.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: This is the most important step. If the vehicle does not start, you must perform the Vehicle Theft Deterrent (VTD) relearn using a compatible GM programming interface like TIS2Web or Techline Connect. Other procedures like a crankshaft variation relearn may also be necessary. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module is a direct replacement for several part numbers, including 12692068, 12704476, 12674052, 12674472, and 12678815. It is guaranteed to fit the following vehicles:
- 2017 Cadillac Escalade / Escalade ESV
- 2017 Cadillac XTS (3.6L Twin Turbo, VIN 8, opt LF3)
- 2017 Cadillac CTS (6.2L Supercharged or 3.6L Twin Turbo)
- 2017 Cadillac ATS (3.6L, VIN Y, opt LF4)
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe / Suburban 1500
- 2016-2018 Chevrolet Silverado 1500 Pickup
- 2017 GMC Yukon / Yukon XL 1500
- 2016-2018 GMC Sierra 1500 Pickup
- 2017-2018 GMC Sierra Denali 1500
Note: For 2016 and 2018 models, please verify your original part ID matches the compatible numbers listed.
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the module with the exact software and calibrations specified by GM for your vehicle’s engine, transmission, and options. This ensures compatibility and proper function right out of the box.
What is a Vehicle Theft Deterrent (VTD) relearn?
The VTD system, also known as the immobilizer, prevents theft by ensuring the ECM, ignition key, and other modules are synced. When you install a new ECM, this link is broken. The relearn procedure re-establishes this connection, allowing the engine to start. It requires a professional scan tool with GM software (e.g., Techline Connect).
Can I install this myself without a special scan tool?
You can physically install the module, but you will likely need access to a GM-compatible programming tool to perform the VTD relearn to start the vehicle. Many independent repair shops have this capability if you do not.
What happens if I don’t do the other relearns like the crankshaft variation?
Failing to perform necessary relearns can result in a check engine light, rough idle, or poor performance. The Crankshaft Position System Variation Learn procedure, for example, is critical for the ECM to accurately detect misfires. We strongly recommend completing all required setup procedures.
Is this a brand new part?
This is a high-quality, fully tested, and guaranteed functional replacement part that has been programmed with the latest GM-certified software for your vehicle. It is a reliable and cost-effective alternative to a dealership part.