Is your 2001-2003 Chevrolet Impala, Pontiac Grand Prix, or Buick LeSabre running rough, stalling, or throwing confusing check engine light codes? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and difficult-to-diagnose issues. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of problems that can mimic other component failures, leading to wasted time and money on incorrect repairs.
This is a direct replacement for GM part numbers 12209624 and 12210234. We take the guesswork out of the repair process. Each module is meticulously programmed with the latest GM software updates specifically for your vehicle using the VIN you provide. This ensures that once you receive the part, it is ready for a straightforward installation, restoring your vehicle’s original performance, reliability, and fuel efficiency. Don’t let a faulty computer keep your car off the road. Get the correctly programmed solution and drive with confidence again.
From the Diagnostic Bay
We had a 2002 Buick Regal come in that was giving the owner fits. The car would randomly misfire, the transmission would shift hard, and the check engine light was on with codes for the MAP sensor and a random misfire. The owner had already replaced the spark plugs, wires, and even the mass airflow sensor with no luck. After hooking up our scanner and watching the live data, we noticed the fuel trim and ignition timing values were erratic and inconsistent. Instead of chasing more sensors, we inspected the PCM. Sure enough, we found signs of internal corrosion on the board, a common issue. We installed a VIN-programmed PCM like this one, performed the crankshaft position sensor relearn, and the car ran perfectly. It’s a classic case of the vehicle’s ‘brain’ causing symptoms that point everywhere else.
Common Symptoms of a Failing GM 3.8L PCM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stumbling, misfiring, or running rough.
- ✔ Difficulty starting the engine or a no-start condition.
- ✔ Poor fuel economy for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling while driving or at idle.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Programmed Impala PCM Replacement?
Finding a replacement PCM for your GM vehicle is only half the battle. A module from a salvage yard or a generic online seller will not work correctly out of the box. It must be programmed to recognize your vehicle’s specific Vehicle Identification Number (VIN) and its unique set of features. Our service eliminates this critical and often complicated step. We handle the programming for you before the part ever ships. By providing us with your VIN during checkout, you receive a unit that is truly plug-and-play. This process ensures all related modules (like the BCM and ABS) communicate correctly with the new PCM, preventing a host of new electrical issues and getting you back on the road faster.
Wide Compatibility with GM 3.8L Vehicles
This module is not just for the Impala. It is the correct electronic control module for a wide range of popular GM vehicles equipped with the legendary 3.8L V6 engine. Please verify your part number and check the fitment list below to ensure compatibility.
- Buick: LeSabre (2001-2003), Park Avenue (2001-2002), Regal (2000-2002)
- Chevrolet: Camaro (2001-2002), Impala (2001-2003), Monte Carlo (2001-2003)
- Pontiac: Bonneville (2001-2003), Firebird (2001-2002), Grand Prix (2001-2003)
Installation is straightforward for anyone with basic mechanical skills. The module is typically located in the engine compartment, often on the driver’s side near the air filter box. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old PCM, unbolt it, and install the new one in its place. After reconnecting the battery, you may need to perform a crankshaft position sensor variation relearn procedure (also known as a CASE relearn), which can be done with many professional-grade scan tools.
What is VIN programming and why is it required?
VIN programming is the process of loading your vehicle’s specific software and security information onto the PCM. This information is tied to your Vehicle Identification Number (VIN). Without it, the PCM cannot communicate with other modules in your car, leading to a no-start condition and other system failures. We perform this service for you so the part is ready to install upon arrival.
Do I need to send my old PCM back (core charge)?
No, there is no core charge associated with this purchase. You can keep your old part or recycle it locally without any obligation to return it to us.
Is any additional programming needed after installation?
In most cases, no further programming is needed. However, for optimal performance, it is highly recommended to perform a Crankshaft Position (CKP) Sensor Variation Relearn, also known as a CASE relearn. This procedure synchronizes the new PCM with the engine’s crankshaft sensor and can be performed by most repair shops with a capable scan tool.
Where is the PCM located on my 2002 Impala?
On the 2001-2003 Chevrolet Impala and Monte Carlo, the PCM is located in the engine bay, inside the air filter housing on the driver’s side of the vehicle. This location protects it from excessive heat but requires removing the top of the airbox for access.
How long does the programming and shipping process take?
Once you provide your VIN, programming is typically completed within one business day. We then ship the module out to you. The total time to receive your part will depend on the shipping method you select at checkout.