Restore Peak Performance to Your GM Vehicle
Is your 2018 Cadillac Escalade ESV, Silverado, or other GM vehicle suffering from frustrating, hard-to-diagnose issues? A faulty Engine Control Module (ECM) is often the culprit behind problems like a persistent check engine light, poor engine performance, intermittent stalling, or a complete no-start condition. This module, part number 12704475, is the direct, reliable solution you need. As the ‘brain’ of your vehicle’s engine management system, a properly functioning ECM is critical for everything from fuel mixture and ignition timing to transmission shifting and emissions compliance.
We take the guesswork and high dealership costs out of the equation. Before this ECM ships, we program it with the latest official GM software, precisely matched to your vehicle using the VIN you provide. This ensures that when you receive it, the foundational calibrations are already in place, saving you a costly trip to the service center for initial programming. This is the most efficient way to get your truck, SUV, or performance car back to its factory-spec operational state. This unit is a direct replacement for several part numbers, including 12692069, 12680656, 12686383, and 12688528.
A Technician’s Notebook
I remember a 2018 Sierra 1500 that came into the bay with a complaint of random stalling at stoplights and a P0606 (ECM/PCM Processor Fault) code that would pop up intermittently. The owner had already replaced the battery and cleaned the throttle body, but the problem persisted. After confirming stable power and ground to the module, we knew the internal processor of the original ECM was failing. Swapping in a VIN-programmed ECM like this one was the definitive fix. The key, however, was performing the Crankshaft Position Variation relearn afterward. Without that final step, the engine would have run rough. It’s a perfect example of how a quality part and correct procedure work together for a successful repair.
Is Your GM Vehicle Showing These ECM Failure Signs?
- ✔ Check Engine Light is on with no obvious cause.
- ✔ Common diagnostic trouble codes (DTCs) like P0601, P0606, or U0100 are present.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Failure to pass state emissions testing.
Your Straightforward Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the ECM: On most trucks and SUVs like the Escalade or Silverado, the ECM is in the engine compartment, typically on the driver’s side. On a Corvette, it’s located on the RH cowl under the dash. Consult a service manual if you’re unsure.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. There are usually locking tabs that need to be released. Once disconnected, unbolt the old ECM from its mounting bracket.
- ✔ Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts. Reconnect all electrical harnesses, ensuring they click firmly into place.
- ✔ Reconnect Power: Re-attach the negative battery terminal.
- ✔ Perform Necessary Relearns: This is a critical step. The vehicle may not start until a Security/Theft Deterrent Relearn is completed. Other procedures like a Crankshaft Variation Relearn may also be required for smooth operation. See our FAQ for more details.
Verified Fitment For These GM Models
This Engine Control Module is a confirmed fit for the following vehicles. Please match your part number or contact us with your VIN to ensure compatibility.
- Cadillac Escalade / ESV: 2018
- Cadillac XTS: 2018 (3.6L with VIN 8)
- Chevrolet Corvette: 2018, 2019 (LT1 & LT4)
- Chevrolet Express 2500/3500 Van: 2018 (4.3L)
- Chevrolet Silverado 1500: 2018
- Chevrolet Suburban 1500: 2018
- Chevrolet Tahoe: 2018
- GMC Savana 2500/3500 Van: 2018 (4.3L)
- GMC Sierra 1500 / Denali 1500: 2018
- GMC Yukon / Yukon XL 1500: 2018
Frequently Asked Questions
Frequently Asked Questions
Why do you need my Vehicle Identification Number (VIN)?
Your VIN is essential for us to load the exact, correct GM factory software for your vehicle’s specific engine, transmission, and options. This pre-programming service is what makes the installation process so much smoother.
Is this part truly plug-and-play?
It is ‘plug-in’ ready, but not fully ‘play’ ready. While the main engine software is programmed, your vehicle’s security system requires a ‘handshake’ with the new ECM. This is the Vehicle Theft Deterrent Relearn, which must be performed on-site after installation.
What is a Vehicle Theft Deterrent Relearn?
It’s a security procedure that syncs the new ECM to your vehicle’s ignition keys and anti-theft system. Without it, the system assumes a theft is in progress and will prevent the engine from starting. This procedure requires a compatible scan tool or access to GM’s TIS2Web/Techline Connect service.
Can I perform the relearn procedures myself?
If you are a DIYer with an advanced bidirectional scan tool or a subscription to GM’s software, yes. Otherwise, this final step will need to be completed by a professional mechanic or a shop with the appropriate equipment. The buyer is responsible for completing these post-installation procedures.
Will this fix my specific problem?
This ECM is a direct solution for failures internal to the module itself (e.g., processor faults, driver circuit failures). While it resolves a wide range of issues, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems caused by faulty sensors, wiring, or other external components.
What other part numbers does this replace?
This ECM, 12704475, is the correct service replacement for several earlier part numbers, including 12692069, 12680656, 12686383, and 12688528, ensuring you get the most updated component available.