Restore Peak Performance to Your GM Truck or Car
Is your 2010-2012 GMC Canyon suffering from frustrating, hard-to-diagnose issues? Unexplained stalling, a persistent check engine light, rough idling, or a complete no-start condition can often be traced back to a failing Engine Control Module (ECM). As the brain of your vehicle, a faulty ECM can disrupt everything from fuel delivery and spark timing to transmission shifting. This replacement ECM, part number 12678513, is the definitive solution to get your vehicle running reliably again. We take the guesswork and extra cost out of the repair by programming the module specifically to your vehicle’s VIN before it ships, loading it with the latest factory software from GM.
From the Diagnostic Bay: The Intermittent Stall Mystery
I remember a 2011 Canyon 5.3L that came into my shop after visiting two other garages. The owner was fed up with it stalling randomly at red lights. They had already replaced the fuel pump and a camshaft position sensor with no luck. The truck threw no consistent codes, just a generic U0100 (Lost Communication with ECM/PCM) every once in a while. After checking all the wiring and grounds, we hooked up a scope to the ECM’s power and data lines. We discovered intermittent voltage drops right at the module itself. A failing internal processor was causing it to momentarily shut down and reboot, creating the stall. Swapping in a properly programmed ECM like this one solved the problem for good. It’s a classic case where the root cause is the computer, not the parts it controls.
Is Your Vehicle Showing These Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement. This is especially true if you see diagnostic trouble codes (DTCs) like P0601, P0606, or U0100.
- ✔ Engine stalling or cutting out intermittently
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Check Engine Light is on with internal module fault codes
- ✔ Poor fuel economy and engine performance
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication issues with diagnostic scan tools
- ✔ Apparent failure of multiple sensors at once
A Straightforward Guide to Installation
Replacing your 2010-2012 Canyon ECM is a manageable job for a DIYer with basic tools. Since we program the module to your VIN, you can skip the expensive trip to the dealership for software flashing. Follow these general steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2010-2012 Canyon/Colorado and Hummer H3, the ECM is typically located on the right-hand (passenger side) firewall in the engine bay.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely fasten it.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure to sync the new ECM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require special tools. We include instructions for this process.
Verified Vehicle Compatibility
This ECM is a direct replacement for service numbers 12678513 and 12633264. It is guaranteed to fit and function correctly in the following vehicles when programmed for your specific VIN:
- CANYON 10-12 Electronic Control Module; (RH firewall), 5.3L
- COLORADO 10-12 Electronic Control Module; (RH firewall), 5.3L
- HUMMER H3 10 Electronic Control Module; (RH firewall), 5.3L
- CAMARO 12 Electronic Control Module; 3.6L, ID 12633264
- CAMARO 12 Electronic Control Module; 6.2L, ID 12633264
- CAMARO 13-15 Electronic Control Module; 6.2L, VIN P (8th digit, opt LSA)
- CORVETTE 10-13 Electronic Control Module; (RH engine compartment), 6.2L, VIN R or T (8th digit, opt LS9)
- CTS 10-13 Electronic Control Module; (RH front engine compartment), 6.2L
- CTS 14 Electronic Control Module; Cpe, Sdn, or SW, 6.2L
- CTS 15 Electronic Control Module; Cpe
- MALIBU 10-12 Electronic Control Module; 3.6L
What information do you need from me?
After you complete your purchase, we simply need your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct, updated GM software for your exact vehicle configuration, ensuring proper function.
Is this a simple plug-and-play installation?
It’s very close. Because we program it, you avoid a trip to the dealer for flashing. However, you will need to perform a standard GM Security Relearn Procedure, which involves a series of key cycles over 30 minutes. Instructions are provided, and no special tools are needed.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old ECM (e.g., codes P0601, P0606), then yes, this part is the correct fix. If the code is for a separate sensor or component, that part will also need to be addressed.
Why is this better than a used part from a salvage yard?
A used ECM from a salvage yard will be programmed for the donor vehicle and will not work in yours without being professionally reprogrammed. Our module arrives with fresh, updated software specific to your VIN and is verified to be in excellent working condition, saving you time, money, and uncertainty.
What is the difference between part numbers 12678513 and 12633264?
These are interchangeable GM service numbers for the same physical ECM hardware. As long as your original module has one of these numbers, this part is a correct replacement once programmed.