Restore Peak Performance to Your GM Truck or Car
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable truck into a source of constant frustration. Mysterious check engine lights, unexplained stalling, poor fuel economy, and erratic transmission behavior are all classic signs that the brain of your vehicle is struggling. If you’re dealing with these issues in your 2014-2016 Sierra 1500 or other compatible GM vehicle, you’ve found the definitive, hassle-free solution. This isn’t just a part; it’s a restoration of your vehicle’s reliability and performance.
We take the guesswork and extra expense out of the equation. Each module, part number 12672963, is professionally flashed with the latest official GM software updates. All we need is your vehicle’s VIN during checkout. When the part arrives at your door, it’s ready for installation, saving you a costly trip to the dealership for programming. This is the most direct path to getting your truck running right again.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start, or starts and immediately stalls.
- ✔ Noticeable drop in fuel mileage for no apparent reason.
- ✔ Unpredictable or harsh shifting from the automatic transmission.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with other vehicle modules.
Case Study: A Tricky Diagnosis
A customer brought in a 2015 Silverado 1500 with a complaint of intermittent stalling at stoplights and a check engine light. They had already replaced the throttle body and a MAP sensor based on some forum advice, but the problem persisted. My scan tool showed a P0606 code (ECM/PCM Processor Fault). After verifying the power and ground circuits to the module were solid—a critical first step—it was clear the internal processor was failing. We installed a pre-programmed ECM, performed the security relearn procedure, and the truck ran perfectly. It’s a classic example of how targeting the root cause with the right part saves time and money.
A Straightforward Guide to Your 2014-2016 Sierra 1500 ECM Installation
Replacing your ECM is a job most DIYers with basic tools can handle in their own driveway. The key is to be patient and methodical. While a security relearn procedure may be necessary after installation, the core physical swap is simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On most Sierra and Silverado trucks from this era, the ECM is located in the front left (driver’s side) of the engine compartment, often near the battery or airbox.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors. These can be brittle, so use a small flathead screwdriver to gently pry if needed. Never pull on the wires themselves.
- Unbolt the Old Module: Remove the bolts or nuts securing the old ECM to its bracket. Keep the hardware in a safe place.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the electrical harnesses back into the new module until they click securely into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In many cases, you will need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new ECM to recognize your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This ECM is a direct replacement for a wide range of General Motors vehicles and is compatible with multiple original part numbers, including 12692067, 12676230, 12656993, and 12662034. Please verify your vehicle is on this list. If you have any doubts, send us your VIN, and we’ll confirm fitment for you.
SIERRA 1500 PICKUP 14-15
SIERRA DENALI 1500 14-15
ATS 14 (ID 12656993), 15-16 (3.6L)
CAMARO 16 (6.2L)
CANYON 15-16 (3.6L)
COLORADO 15-16 (3.6L)
CORVETTE 14-16
CTS 14-15 (Sdn, 3.6L), 16 (3.6L or 6.2L)
ESCALADE & ESCALADE ESV 15-16
SUBURBAN 1500 15-16
TAHOE 15-16
YUKON & YUKON XL 1500 15-16
XTS 14-16 (3.6L, VIN 8)
SIERRA/SILVERADO 1500 PICKUP 16 (ID 12662034, 12672537, or 12673195)
Your Questions Answered
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. You just need to provide your VIN number after purchase. This ensures the module has the correct software for your vehicle’s specific options.
What is a VIN and why do you need it?
VIN stands for Vehicle Identification Number. It’s a unique 17-digit code for your vehicle that tells us everything we need to know: engine size, transmission type, and other factory options. This allows us to load the exact right software onto your new ECM.
Is a security relearn procedure difficult?
Not at all. For most GM vehicles, it’s a simple key-on/key-off procedure that takes about 30 minutes. We include instructions, and it requires no special tools. This syncs the new ECM with your vehicle’s existing anti-theft system.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (common codes P0601-P0606), then yes, this part will resolve the issue. It’s always best to have the codes professionally diagnosed to confirm the ECM is the root cause before ordering.
Is this compatible with part number 12672963?
Yes. This module is fully compatible with and serves as a direct replacement for part number 12672963, as well as many others listed in the description.