Get Your Hard-Working GM Truck Back on the Job
Is your 2013-2014 GM truck or van with the 6.6L Duramax engine giving you headaches? Unexplained stalling, a persistent check engine light, or a complete no-start condition can bring your work to a halt. In my 20+ years of hands-on diagnostics, I’ve seen these symptoms countless times, and they often point directly to a failing Engine Control Module (ECM). This isn’t just an inconvenience; it’s a critical failure that affects everything from fuel delivery to transmission shifting. This listing is for a reliable, used OEM Engine Control Module, part number 12654088, which also replaces service number 12653319.
The biggest hurdle in replacing an ECM is the programming. We take that complex step off your plate. Before we ship this module, we will flash it with the latest official GM software calibrations, programmed specifically to your vehicle’s VIN. This ensures that it communicates perfectly with the other modules in your truck, restoring factory performance and reliability. You get a part that’s ready for installation, saving you a costly trip to the dealership and significant diagnostic time.
A Technician’s Notebook: The Intermittent No-Start Mystery
A local contractor brought in his 2013 Silverado 2500. The truck would start and run perfectly for weeks, then suddenly refuse to start, leaving his crew stranded. There were no consistent trouble codes, just a frustratingly intermittent problem. After checking all the usual suspects—batteries, grounds, starter—we focused on the ECM. On a hunch, we monitored the module’s internal temperature during operation. We found that after long drives, heat soak was causing an internal processor fault within the ECM. We swapped in a pre-programmed module like this one, and the problem was solved instantly. It’s a classic example of how a failing 2013-2014 Savana 2500 ECM can present itself in tricky, intermittent ways.
Is Your Truck Showing These Symptoms?
A faulty ECM can cause a wide range of issues. If you’re experiencing any of the following, this module is the likely solution for your GM 6.6L Duramax:
- ✔ Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Vehicle refuses to start or cranks but won’t fire up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine stalling or running rough, especially after warming up.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Problems with the transmission shifting correctly.
A Straightforward Guide to Installation
Installing your replacement 2013-2014 Savana 2500 ECM is a manageable job for a confident DIYer or any professional technician. The key is following the correct procedures, especially the post-installation steps.
- Safety First: Always disconnect the negative battery terminal and wait at least 15 minutes for the system capacitors to discharge before beginning work.
- Locate the ECM: On Savana and Express vans, the ECM is on the driver’s side, at the rear of the engine compartment. On Sierra and Silverado pickups, it’s on the driver’s side, at the front of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the replacement ECM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- CRITICAL – Post-Installation Relearns: This is the most important step. If the vehicle does not start, a Vehicle Theft Deterrent System Relearn must be performed using a GM-compatible scan tool with access to TIS2Web. Other procedures, like a Crankshaft Position Variation Relearn or injector flow rate programming, may also be required to ensure optimal performance. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM HD trucks and vans equipped with the 6.6L Duramax diesel engine. Please verify your part number and application from the list below:
- Chevrolet Express 2500/3500 Van (2013-2014): 6.6L, located in LH rear engine compartment.
- GMC Savana 2500/3500 Van (2013-2014): 6.6L, located in LH rear engine compartment.
- Chevrolet Silverado 2500/3500 Pickup (2013-2014): 6.6L, located in LH front engine compartment.
- GMC Sierra & Sierra Denali 2500/3500 Pickup (2013-2014): 6.6L, located in LH front engine compartment.
Frequently Asked Questions
Why do you need my VIN number?
Your Vehicle Identification Number (VIN) allows us to load the exact, correct software and calibrations for your truck’s specific configuration. This step is essential for proper engine, transmission, and emissions system operation and is included with your purchase.
What is a “theft relearn” and why do I need to do it?
The theft relearn procedure (VATS/Passlock) synchronizes the new ECM with your vehicle’s anti-theft system and ignition key. Without this step, the security system will prevent the engine from starting. This requires a professional scan tool with GM software access (like TIS2Web) and is a standard procedure when replacing an ECM.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. This provides a reliable and cost-effective alternative to a much more expensive new part from a dealer.
What other “relearns” might be necessary?
Depending on your vehicle, you may need to perform a Crankshaft Position Variation Relearn for misfire detection accuracy or enter injector flow rate data. These are standard procedures for any professional technician installing an engine computer.
Can I install this myself if I don’t have a professional scan tool?
You can physically install the module, but you will need to have the vehicle towed to a qualified repair shop or contact a mobile technician to perform the required theft relearn procedure before the vehicle will run.