Restore Peak Performance to Your GM Vehicle
Is your 2011 Silverado, Sierra, or Cruze suffering from frustrating and unpredictable engine problems? A faulty Engine Control Module (ECM) is often the culprit behind issues like stalling, poor fuel economy, a persistent Check Engine Light, or a complete no-start condition. As the central computer of your vehicle, the ECM manages everything from fuel injection and ignition timing to transmission shifting. When it fails, the entire system is compromised. This replacement 2011 Silverado 3500 ECM, part number 12642100, is the reliable, straightforward solution to get your vehicle running properly again.
We take the guesswork and extra cost out of the repair. Unlike sourcing a module from a salvage yard or dealership, this unit comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load it with the latest GM software updates, ensuring optimal performance and compatibility right out of the box. This critical step means you can avoid expensive dealer programming fees and lengthy service appointments. Simply provide your VIN after purchase, and we handle the rest, shipping you a module that’s ready for installation.
Is Your GM Vehicle Showing These ECM Failure Signs?
- âś” Unexplained Check Engine Light (CEL) illumination.
- âś” Common diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” The engine cranks but refuses to start.
- âś” Intermittent stalling or rough idling.
- âś” Noticeable decrease in fuel efficiency.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Communication errors with diagnostic scan tools.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Sierra 2500 with the 6.0L V8 that had an intermittent no-start condition that was driving him crazy. It would be fine for weeks, then leave him stranded. His local shop had replaced the battery and checked the fuel pump, but the problem persisted. When I hooked up my professional scanner, I noticed intermittent communication loss with the engine module—a classic sign of an internal ECM failure. The module’s processor was failing under certain temperature conditions. Instead of a lengthy and expensive diagnostic process, we confirmed the fix with this VIN-programmed 2011 Silverado 3500 ECM. The customer was back on the road the same day, problem solved, saving him hundreds in what could have been wasted diagnostic labor.
Your Straightforward Installation Guide
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- âś” Locate the ECM: On these GM trucks and the Cruze, the ECM is typically found in the front engine compartment on the driver’s side (LH side).
- âś” Disconnect Connectors: Carefully release the locking tabs and unplug the main wiring harness connectors from the old ECM. Inspect them for any corrosion or damage.
- âś” Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will reuse it.
- âś” Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- âś” Reconnect and Secure: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- âś” Final Steps: In some cases, a security relearn procedure may be required, which can typically be done without special tools. Turn the key to the ‘ON’ position for 10-15 minutes, then off, and repeat two more times before attempting to start the engine.
Verified Fitment for Your GM Car or Truck
This module is a direct-fit replacement for several vehicles, ensuring broad compatibility. Please verify your vehicle and engine options below. This part is a confirmed replacement for part numbers 12616532, 12642100, and 12656958.
- 2011 Chevrolet Cruze: with 1.4L Engine
- 2011 Chevrolet Silverado 2500/3500 Pickup: with 6.0L Engine
- 2011 GMC Sierra 2500/3500 Pickup: with 6.0L Engine
- 2011 GMC Sierra Denali 2500/3500: with 6.0L Engine
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during checkout or via message, and the module will arrive with the latest GM software, ready for installation.
Is this a simple plug-and-play installation?
Yes, for the most part. After the physical installation, some vehicles may require a simple security relearn procedure (also known as a key relearn). This procedure does not require special tools and can be done by following the steps in our installation guide.
Will this fix my specific problem?
This 2011 Silverado 3500 ECM is the solution for failures within the module itself, which cause the symptoms listed above. While it solves the most common issues, always ensure a proper diagnosis has been performed to rule out other problems like faulty wiring or sensors.
How do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard, visible through the windshield.
What part numbers does this ECM replace?
This module is a direct replacement for several service numbers, including 12616532, 12642100, and 12656958. Matching one of these numbers ensures compatibility.