Is Your 2008 Impala Running Rough? The Engine Control Module Could Be the Culprit.
The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the central computer of your 2008 Chevrolet Impala. It manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. You might experience a sudden drop in fuel economy, erratic engine behavior, or even a complete no-start condition, leaving you stranded. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s performance, reliability, and safety.
From the Diagnostic Bay
I once had a 2008 Sierra with the 6.0L come in on a tow truck. The owner had replaced the battery, alternator, and starter trying to solve an intermittent no-start problem. All his dash lights would flicker, and the engine would just click. After checking all the primary power and ground connections, we hooked up our diagnostic scanner and couldn’t communicate with the ECM. A quick check of the ECM’s power and ground pins confirmed they were good. The internal processor of the original module had failed. We installed one of our pre-programmed modules, performed the quick security relearn, and the truck fired up instantly. The customer was thrilled to have his truck back and to finally have the correct diagnosis after wasting money on unnecessary parts.
Common Symptoms of a Failing 2008 Impala Engine Module
- ✔ Check Engine Light is on with various communication or processor-related trouble codes.
- ✔ Engine cranks but refuses to start.
- ✔ Stalling, stumbling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel efficiency (MPG).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Misfires or rough idling that can’t be traced to spark plugs or coils.
- ✔ Loss of power or sluggish performance.
The Direct-Fit Solution: A Pre-Programmed ECM
Replacing the ECM on a modern vehicle isn’t as simple as swapping out a battery. The module is specific to your vehicle’s unique Vehicle Identification Number (VIN), containing information about its engine, transmission, and factory options. This replacement 2008 Impala Engine Module, part number 12622141, eliminates the guesswork and the expensive trip to a dealership. We handle the complex programming for you. Simply provide us with your vehicle’s VIN after purchase, and our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it’s a true plug-and-play solution designed for optimal performance and reliability.
This module is a direct replacement for part numbers 12622141, 12612384, and 12617568, and it fits a wide range of GM vehicles beyond the Impala, as detailed in our comprehensive fitment list. Each unit is meticulously inspected and prepared to restore your vehicle’s factory functionality.
SIERRA 2500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
SUBURBAN 1500 08 Electronic Control Module; (LH front under battery)
AVALANCHE 1500 08 Electronic Control Module; (LH front under battery)
TORRENT 08-09 Electronic Control Module; (LH engine compartment), 3.4L
VUE 08-09 Electronic Control Module; 3.5L
AURA 08 Electronic Control Module; (RH firewall), 3.5L
CTS 08 Electronic Control Module; (RH front engine compartment), (3.6L), VIN 7, ID 12612384
CORVETTE 08-09 Electronic Control Module; (RH engine compartment)
IMPALA 08 Electronic Control Module; (lower part of air cleaner box), 3.9L or 3.5L
SILVERADO 1500 PICKUP 08 Electronic Control Module; (LH front under battery), w/o 4.3L
YUKON 08 Electronic Control Module; (LH front under battery), w/o hybrid option
TAHOE 08 Electronic Control Module; (LH front under battery), w/o hybrid option
…and many more GM trucks, vans, and SUVs.
Frequently Asked Questions
What is an ECM and what does it do?
The Engine Control Module (ECM) is your vehicle’s main computer. It controls the engine’s fuel delivery, spark timing, and emissions systems to ensure optimal performance, fuel economy, and low emissions. It’s the brain of your vehicle’s powertrain.
Is this part ready to install when it arrives?
Yes! This module is programmed to your vehicle’s specific VIN before we ship it. In most cases, it is a plug-and-play installation. However, you may need to perform a simple security relearn procedure, which does not require any special tools and instructions can be easily found online.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
My original part number is 12612384. Will this part work?
Absolutely. This ECM, part number 12622141, is a fully compatible and updated replacement for part numbers 12612384 and 12617568. It will function identically to your original module.
Do I need to send my old ECM (core) back?
No core charge or return is required for this part. You can keep or responsibly dispose of your old module.