Restore Peak Performance to Your GM 6.6L Duramax
Is your work van or heavy-duty truck suddenly unreliable? If you’re dealing with frustrating no-start conditions, a persistent check engine light, or erratic engine behavior in your 2013-2014 GM vehicle, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your engine, the ECM’s health is critical. This isn’t just a part; it’s the brain of your powertrain, and we provide a dependable, cost-effective solution to get you back on the road with confidence.
This listing is for a thoroughly tested, used OEM Engine Control Module, compatible with service numbers 12653319 and 12654088. The real value here is our professional programming service. Before we ship it, we flash the module with the latest official GM software calibrations, tailored specifically to your vehicle’s VIN. This ensures correct engine, transmission, and emissions performance, saving you a costly trip to the dealership for programming. You get a part that’s ready for installation and the final security relearn process.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I remember a 2013 Silverado 2500 that came into my shop. The owner was at his wit’s end. The truck would start fine for a week, then refuse to crank for two days straight, with no rhyme or reason. No codes were stored consistently. We checked batteries, starters, and grounds—all perfect. On a hunch, I monitored the ECM data stream during a no-start event. The module was dropping communication intermittently. After letting the engine cool, it would fire right up. The ECM had an internal fracture that only separated when it reached operating temperature. Replacing the ECM with a quality, programmed unit like this one solved the problem permanently. These intermittent issues are classic signs of a failing computer.
Is Your Truck or Van Showing These Symptoms?
A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Complete no-start or no-crank condition.
- ✔ Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like U0100 (Lost Communication with ECM/PCM).
- ✔ Internal module failure codes such as P0601, P0606, or P062F.
- ✔ Poor fuel economy and reduced engine power.
- ✔ Engine stalling or running rough for no apparent reason.
- ✔ Issues with the transmission shifting correctly, as the ECM communicates with the TCM.
A Straightforward Guide to Installation
Installing your replacement 2013-2014 Express 3500 ECM is manageable for a skilled DIYer or any professional technician. Follow these general steps for a successful replacement.
- Safety First: Always disconnect the negative battery terminal and wait 10-15 minutes for the system capacitors to discharge before starting work.
- Locate the ECM: On Express/Savana vans, it’s typically in the LH rear engine compartment. On Sierra/Silverado trucks, it’s found in the LH front engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to release the locking tabs if necessary—don’t force them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Seat the replacement ECM into the bracket and secure the bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- CRITICAL – Security Relearn: Turn the key to the ‘ON’ position. The vehicle may not start at this point due to the anti-theft system. A security relearn procedure must be performed using a GM-compatible scan tool or the TIS2Web software service. This syncs the new ECM to your vehicle’s security system.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Variation Relearn or injector flow rate programming may be necessary. This is the responsibility of the installer and is standard practice after an ECM replacement.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM heavy-duty trucks and vans equipped with the 6.6L Duramax diesel engine. Please verify your part number and application against this list:
- 2013-2014 Chevrolet Express 2500/3500 Van (6.6L)
- 2013-2014 GMC Savana 2500/3500 Van (6.6L)
- 2013-2014 Chevrolet Silverado 2500/3500 Pickup (6.6L)
- 2013-2014 GMC Sierra 2500/3500 Pickup (6.6L, including Denali)
After you complete your purchase, we require your 17-digit Vehicle Identification Number (VIN). This allows us to load the exact, most current GM-approved software calibration for your specific vehicle configuration.
For a professional technician with a capable scan tool (like a Snap-on, Autel, or GM’s MDI with TIS2Web), it’s a standard, 10-minute procedure. For a DIYer without these tools, it is not possible. You will need to have a local shop or mobile mechanic perform this step.
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module from a dealer.
If the check engine light is caused by an internal ECM failure (like codes P0601, P0606, or U0100), then yes, this part is the correct fix. However, you must ensure the root cause of the failure (e.g., a shorted sensor or wire) has been repaired to prevent damage to the replacement module.
No core charge or return is required for this part. You can keep or dispose of your old module.
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