Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Spark, Sonic, or Cruze suffering from baffling electrical gremlins? A failing Engine Control Module (ECM), the vehicle’s central computer, is often the culprit behind issues like a persistent Check Engine Light, poor fuel economy, stalling, or a frustrating no-start condition. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can disrupt every aspect of your vehicle’s operation. This isn’t just an inconvenience; it’s a core reliability issue that needs a definitive solution.
This replacement Engine Control Module is the answer. It’s not just a part; it’s a complete, ready-to-install solution. We take the biggest headache out of the repair by professionally programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it even leaves our facility. This ensures it has the latest GM software updates and communicates perfectly with your car’s other systems, just like the original. You get a reliable fix without the exorbitant cost and scheduling hassles of a dealership service visit.
Case Study: A Tricky Diagnosis
A customer brought in a 2014 Chevy Sonic that would intermittently refuse to start. No rhyme or reason. It had been to two other shops that replaced the battery and starter to no avail. When I hooked up my professional scan tool, I noticed intermittent communication loss with the ECM (a U0100 code). Instead of just firing the parts cannon, we monitored the ECM’s power and ground feeds during the no-start events. They were perfect. The issue was internal to the module itself, a classic sign of heat-related failure on these circuit boards. We installed a VIN-programmed ECM, performed the security relearn, and the car has been starting reliably ever since. This is why a quality, correctly programmed module is non-negotiable.
Is Your Vehicle Showing These Symptoms?
- âś” Persistent Check Engine Light (CEL)
- âś” Engine stalling, stumbling, or misfiring
- âś” Complete no-start or intermittent starting problems
- âś” Noticeable decrease in fuel efficiency
- âś” Failed emissions test
- âś” Communication error codes (like U0100)
- âś” Internal module fault codes (such as P0601, P0606)
- âś” Erratic automatic transmission shifting
A Straightforward Guide to Installation
Replacing the ECM is a manageable job for a confident DIYer. Our pre-programming service handles the most complex step, but a final on-vehicle procedure is required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: On most of these models, the ECM is found in the engine bay. Consult a vehicle-specific repair guide if you’re unsure of its location.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that must be released. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: This is a CRITICAL step. Your vehicle’s anti-theft system must be synchronized with the new ECM. The procedure is typically a 10-minute or 30-minute process involving turning the key to the ‘ON’ position. Search for the “GM Security Relearn Procedure” for your specific model for the exact steps. The vehicle will not start until this is completed.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part number 12663405 and is compatible with a wide range of GM vehicles. We confirm fitment by programming to your VIN, but please check the list below. This part is a verified replacement for the following original part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200.
Fits models including, but not limited to:
- 2014-2015 Chevrolet Spark (Gasoline Model)
- 2011-2015 Chevrolet Volt
- 2012-2016 Chevrolet Cruze (1.4L & others)
- 2012-2016 Chevrolet Sonic (1.4L & others)
- 2013-2016 Chevrolet Trax
- 2013-2016 Buick Encore (1.4L)
- 2014-2016 Cadillac ELR
- 2012-2016 Chevrolet Silverado / GMC Sierra 2500/3500 (6.0L)
- 2016 Chevrolet Express / GMC Savana Van (4.8L, 6.0L)
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot program and ship the module without it.
Is this part truly plug-and-play?
It is 95% of the way there. We handle all the complex programming. The only remaining step for you is the simple on-vehicle Security Relearn Procedure, which takes about 10-30 minutes with just the ignition key.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (e.g., codes P0601-P0606), this part is the correct fix. However, you should always diagnose the codes first to ensure the problem isn’t a different sensor or component.
Do I need any special tools for installation?
Basic hand tools (like a socket set) are all that’s needed for the physical swap. No special programming tools are required from you.
What if I have a different part number?
This module replaces several part numbers. Please check the cross-reference list provided. If your number is on the list, this part will work once programmed to your VIN.