Restore Your GM’s Core Performance and Reliability
Is your 2017 GMC Yukon or other GM vehicle acting erratically? Experiencing frustrating issues like a no-start condition, random stalling, poor fuel economy, or a dashboard lit up with warning lights? The Engine Control Module (ECM) is the central computer of your vehicle, and when it fails, it can cause a cascade of confusing problems. In my 20+ years of diagnostics, I’ve seen firsthand how a faulty ECM can mimic a dozen other issues, leading to wasted time and money on unnecessary repairs. This module is your direct-fit, reliable solution.
We take the guesswork out of the replacement process. Unlike a standard part from a salvage yard or dealership, this ECM arrives at your door pre-programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. Simply provide us with your VIN at checkout, and we handle the complex programming. This saves you a costly trip to the dealer and gets you one giant step closer to being back on the road.
Case Study: A Tricky Diagnosis
I once had a 2017 Sierra in the bay that was a real head-scratcher. The customer complained of intermittent stalling and had a list of unrelated trouble codes—everything from a transmission communication error (U0101) to an O2 sensor fault. The previous mechanic had already replaced two sensors with no luck. Instead of chasing ghosts, I checked the network communication lines. I found that the ECM was periodically dropping off the CAN bus, causing the other modules to report communication faults. A new, properly programmed ECM, like this one, resolved all the issues at once. It’s a classic example of how the ECM is the true ‘brain’ of the operation.
Is Your GM Truck Showing These Signs?
- âś” Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
- âś” Vehicle will not start or is very difficult to start.
- âś” Intermittent stalling or rough idling for no apparent reason.
- âś” Noticeable decrease in fuel efficiency.
- âś” Communication errors with other modules (U-codes).
- âś” The engine seems to be in a reduced power or “limp mode.”
- âś” Automatic transmission shifting erratically or harshly.
A Straightforward Guide to Installation
Replacing the ECM is a manageable job for a DIYer or any professional technician. Follow these general steps to ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all systems to power down completely.
- Locate the ECM: On most compatible trucks and SUVs like the Yukon, Tahoe, and Sierra, the ECM is located in the engine compartment on the driver’s side (LH front). On other models like the Corvette, it may be in the cowl area.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old module. Inspect the connectors for any signs of corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedures: This is a critical final step. If the vehicle does not start, you MUST perform a Vehicle Theft Deterrent System (VTDS) relearn using a compatible scan tool with access to GM’s TIS2Web or Techline Connect. Other procedures like a Crankshaft Variation Relearn may also be necessary to ensure optimal performance. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It fits the following vehicles:
- Cadillac ATS: 2017 (3.6L, VIN Y)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8)
- Cadillac Escalade / ESV: 2017
- Cadillac XTS: 2017 (3.6L, VIN 8)
- 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 does ‘VIN Programmed’ mean?
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and calibration file from General Motors that matches your vehicle’s unique 17-digit Vehicle Identification Number (VIN). This ensures the ECM works correctly with your engine, transmission, and options, and includes the latest factory updates for performance and reliability.
Why is a ‘theft relearn’ necessary after installation?
Modern vehicles have a security system that links the ECM to other components, like the ignition and body control module. When you install a new ECM, the vehicle’s anti-theft system sees it as an unauthorized part and prevents the engine from starting. The relearn procedure securely ‘introduces’ the new ECM to the vehicle, allowing it to function.
Can I perform the theft relearn myself?
For these specific GM models, the theft relearn requires a professional-grade scan tool with an active subscription to GM’s TIS2Web or Techline Connect software. Most DIY mechanics do not have this equipment. We recommend coordinating with a local, qualified repair shop to complete this final step.
My original part number is 12692068. Will this part work?
Yes. This ECM, part number 12674052, is a fully compatible, interchangeable replacement for several part numbers, including 12692068, 12704476, 12686382, 12674472, and 12678815. It will function identically once programmed to your VIN.