Restore Your Vehicle’s Core Performance and Reliability
Is your workhorse 2016 Express 2500 Van suddenly unreliable? Are you dealing with frustrating issues like stalling, a persistent Check Engine Light, or a complete no-start condition? As a technician with over two decades of diagnostic experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring a perfectly good vehicle to a grinding halt. It’s the brain of your engine, and when it malfunctions, it can cause a cascade of confusing and costly problems. This isn’t just a part; it’s the solution to getting your vehicle back to factory-spec operation and dependability.
This isn’t a generic, off-the-shelf computer. This is a direct-replacement Engine Control Module, part number 22819494, that we professionally program to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This critical step ensures seamless communication with your vehicle’s other systems, loading the latest GM software updates to correct potential factory bugs and optimize performance. By providing your VIN at checkout, you eliminate the need for expensive dealership programming, special scan tools, or costly towing bills. This is the most direct and efficient path to a lasting repair for both professional mechanics and determined DIYers.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2016 Express 2500 6.0L with an intermittent no-start and stalling issue that two other shops couldn’t solve. They had replaced the fuel pump and crank sensor, but the problem persisted. The van would run fine for days, then suddenly die at a stoplight. My scan tool showed a loss of communication code (U0100) and a P0606 (ECM Processor Fault) that would appear and disappear. Instead of just throwing more parts at it, we focused on the ECM. After installing one of our pre-programmed modules, the van ran flawlessly. The issue wasn’t the wiring or other components; it was the original ECM’s internal processor failing under certain conditions—a common failure I’ve seen dozens of times on these work vans.
Is Your GM Vehicle Showing These Signs of a Failing ECM?
- ✔ The engine cranks but refuses to start.
- ✔ Stalling for no apparent reason, either while driving or at idle.
- ✔ A noticeable drop in fuel efficiency and engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Persistent Check Engine Light with codes like P0601, P0602, P0606, or U0100.
- ✔ Communication errors with your diagnostic scan tool.
- ✔ One or more fuel injectors or ignition coils not firing.
A Straightforward Guide to Installation
Replacing the 2016 Express 2500 ECM is a manageable job for someone with basic mechanical skills. Following these steps ensures a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all system capacitors to discharge.
- Locate the ECM: On the Express and Savana vans, the ECM is typically located in the left-hand rear of the engine compartment. On trucks like the Silverado and Sierra, it’s usually on the LH front of the engine compartment. Consult a service manual for your specific model if you’re unsure.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damaged pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket. Reconnect the wiring harnesses, ensuring they click firmly into place and the locking tabs are engaged.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start. In some cases, a security or crank relearn procedure may be required, which can often be done without special tools.
Verified Vehicle Compatibility
This module is a direct replacement for multiple part numbers, including 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It is guaranteed to fit a wide range of GM vehicles when programmed correctly. Please find your vehicle in the list below to confirm fitment:
CHEVROLET ELR (2014-2016)
CHEVROLET EXPRESS 2500/3500 VAN (2016) – 4.8L & 6.0L
CHEVROLET SILVERADO 2500/3500 PICKUP (2012-2016) – 6.0L
CHEVROLET SONIC (2012-2016)
CHEVROLET SPARK (2014-2015)
CHEVROLET SUBURBAN 3500 (2016)
CHEVROLET TRAX (2013-2016)
CHEVROLET VOLT (2011-2015)
BUICK ENCORE (2013-2016)
GMC SAVANA 2500/3500 VAN (2016) – 4.8L & 6.0L
GMC SIERRA 2500/3500 & DENALI (2012-2016) – 6.0L
Frequently Asked Questions About Your New ECM
Frequently Asked Questions
Do I need to do any programming after I install this?
No. We program the module to the VIN you provide before shipping. In most cases, it is a plug-and-play installation. Some vehicles may require a simple crankshaft variation relearn procedure, which can often be initiated without a scan tool.
What is a VIN and why do you need it?
The VIN is your car’s unique 17-digit identification number. We use it to access the correct GM software and calibration files for your vehicle’s specific engine, transmission, and options, ensuring perfect compatibility.
Where can I find my VIN?
Your VIN is located on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
How does this solve my problem?
This replacement 2016 Express 2500 ECM corrects internal hardware and software faults that cause common drivability issues. By using the latest GM-approved software, it restores the engine’s brain to optimal working condition.
Is this a reliable part?
Absolutely. Each module is thoroughly inspected and programmed to meet or exceed original equipment specifications, providing a dependable and long-lasting solution to your vehicle’s electronic problems.