Is Your 6.6L Duramax Acting Up? Get Back on the Road Fast.
If you’re dealing with a no-start condition, a persistent check engine light, erratic engine behavior, or a truck that’s stuck in limp mode, a failing Engine Control Module (ECM) is a likely culprit. For a workhorse like your 2013-2014 Sierra, Silverado, or Express/Savana van, downtime isn’t an option. This isn’t just a part; it’s the central command for your engine’s performance, and when it fails, everything grinds to a halt. In my 20+ years in the shop, I’ve seen how a faulty ECM can mimic a dozen other problems, costing owners time and money chasing ghosts. This replacement ECM is your direct, reliable solution.
The Smart Solution: VIN-Programmed and Ready for Installation
Forget the hassle and high cost of a dealership visit. You provide your vehicle’s 17-digit VIN during checkout, and we handle the rest. We will program this genuine, used GM ECM with the latest factory software calibration specific to your truck. This ensures that when the part arrives, it’s already configured for your engine, transmission, and emissions equipment. It’s the most efficient way to get your vehicle’s brain working correctly again.
- โ VIN Programmed: Arrives with the correct GM software for your specific vehicle, saving you a trip to the dealer for programming.
- โ Solves Common Issues: A direct fix for symptoms like P0606 codes, intermittent stalling, no-start, and poor fuel economy caused by a failing ECM.
- โ Cost-Effective Repair: A high-quality, tested used module offers a dependable solution without the new-part price tag.
- โ Broad Compatibility: This module, part number 12654088, also replaces service number 12653319, fitting a wide range of GM trucks and vans.
Expert Pro Tip: Before You Replace Your ECM
Over the years, I’ve seen countless ECMs replaced when the real issue was a compromised wiring harness. Before you install the new module, take 10 minutes to thoroughly inspect the main ECM connectors and the first 6-8 inches of wiring. On these work trucks, exposure to heat, moisture, and vibration can cause corrosion on the pins or tiny breaks in the wires. A green, corroded pin can cause intermittent power loss that perfectly mimics a bad ECM. Cleaning the connector terminals with a specialized contact cleaner can sometimes solve the problem or, at the very least, ensure your new ECM has a perfect connection.
Simple Installation, Critical Final Steps
Physically swapping the ECM is straightforward for anyone with basic tools. However, getting your truck started requires a few final, essential procedures.
- Safety First: Disconnect the negative battery terminal and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On Sierra and Silverado pickups, it’s on the driver’s side (LH) front of the engine compartment. On Express and Savana vans, it’s on the driver’s side (LH) rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if needed. Then, unbolt the old module from its bracket.
- Install the New ECM: Bolt the replacement module in place and securely reconnect the electrical harnesses. Ensure they click into place. Reconnect the battery.
IMPORTANT: Post-Installation Relearn Procedures
This is the most critical part of the job. Because this ECM is new to your vehicle, its security systems must be synchronized. This is the responsibility of the buyer or their mechanic.
- Vehicle Theft Deterrent (VTD) Relearn: If the truck cranks but won’t start after installation, the VTD system has been activated. A VTD relearn procedure MUST be performed using a professional tool with access to GM’s TIS2Web programming system. Many independent shops have this capability.
- Other Relearns: Depending on your vehicle’s specific configuration, other procedures like a Crankshaft Variation Relearn or Injector Flow Rate programming may be necessary to achieve optimal performance.
Verifying Compatibility for Your 2013-2014 Sierra 3500 ECM
This Engine Control Module is a guaranteed fit for a wide range of GM vehicles equipped with the 6.6L Duramax diesel engine. Please verify that your original module has part number 12654088 or service number 12653319 printed on the label. This part is compatible with the following models:
- 2013-2014 Chevrolet Silverado 2500/3500
- 2013-2014 GMC Sierra 2500/3500 (including Denali)
- 2013-2014 Chevrolet Express 2500/3500 Van
- 2013-2014 GMC Savana 2500/3500 Van
Don’t let a bad computer keep your truck down. Order this VIN-programmed 2013-2014 Sierra 3500 ECM today and get the reliable, pre-configured solution you need to restore your engine’s power and performance.