Is your 2001, 2002, or 2003 Chevrolet Impala suffering from baffling engine problems? Issues like a persistent Check Engine Light, rough idling, stalling, or a complete no-start condition often point to a failing Powertrain Control Module (PCM). As the central computer for your vehicle’s engine and transmission, a faulty PCM can disrupt performance, fuel economy, and reliability. This replacement Powertrain Control Module, part number 09360210, is the definitive solution to restore your vehicle’s factory operation and get you back on the road with confidence.
From the Diagnostic Bay
We had a 2002 Monte Carlo (which uses the same PCM as the Impala) come into the shop with an issue that was driving the owner crazy. It would randomly stall at red lights, but only after it was fully warmed up. There were no consistent trouble codes, just a generic P0300 random misfire code that would pop up occasionally. We checked the fuel pressure, spark plugs, and ignition coils—all were fine. After hours of diagnostics, we monitored the live data from the PCM and noticed the injector pulse width commands were becoming erratic just before a stall. We swapped in a known-good, programmed PCM, and the problem vanished instantly. The original module had an internal fault that only manifested under specific temperature conditions. It’s a classic example of how a failing 2001-2003 Impala PCM can create ghost-like problems that are nearly impossible to trace mechanically.
Diagnosing a Failing 2001-2003 Impala PCM
The PCM is the brain of your vehicle, and when it starts to fail, the symptoms can be widespread and confusing. If you’re experiencing any of the following, your engine computer may be the culprit. This module is the key to resolving these frustrating and often intermittent issues.
Common Symptoms of a Faulty PCM
- ✔ Check Engine Light: The light is on, and you may have codes related to sensors, emissions, or internal module failure (e.g., P0601, P0606).
- ✔ Engine Stalling or Misfiring: Your vehicle may stall unexpectedly while driving or at idle, and you might feel a rough or hesitant engine performance.
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to the PCM not commanding fuel or spark correctly.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s gas mileage can be a sign the PCM is not managing the air-fuel mixture efficiently.
- ✔ Failed Emissions Test: The PCM controls the emissions systems, and a fault will almost certainly cause a test failure.
- ✔ Transmission Shifting Problems: On many GM vehicles, the PCM also controls transmission functions. You might experience harsh shifting, delayed engagement, or getting stuck in a single gear.
- ✔ Intermittent Electrical Issues: Gauges acting erratically or other strange electrical behavior can sometimes be traced back to the central computer.
Plug-and-Play Solution
The biggest hurdle when replacing a modern vehicle computer is the programming. This module eliminates that challenge. We flash this PCM with the latest GM-certified software updates specifically for your vehicle using the VIN you provide at checkout. This ensures that it communicates perfectly with your car’s existing systems, including the anti-theft (Passlock/VATS) and other modules. This VIN-specific programming makes the installation process as straightforward as possible, saving you a trip to the dealership and expensive programming fees.
This unit is a direct replacement for multiple GM part numbers, including 09360210, 12209614, and 12202600. It fits a wide array of GM vehicles from the early 2000s, such as the Chevrolet Monte Carlo, Pontiac Grand Prix, Buick Century, and Oldsmobile Alero, among others. Please verify the part number or consult the detailed fitment list to ensure compatibility with your specific make, model, and engine.
Frequently Asked Questions
Do I need to program this module?
No. We handle the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and the module will arrive ready for installation with the latest GM software for your car.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. PCM (Powertrain Control Module) typically controls both the engine and transmission. ECM (Engine Control Module) or ECU (Engine Control Unit) usually refers to a module that only controls engine functions. For this specific GM application, it is a PCM.
Will I need to perform any other procedures after installation?
In many cases, you may need to perform a simple security relearn procedure, which can be done without special tools and typically involves a sequence of key turns. Instructions are readily available online. Some vehicles may also require a Crankshaft Variation (CASE) relearn, which requires a scan tool, to prevent a P1336 trouble code.
Where is the PCM located on my 2001-2003 Impala?
On the 2001-2003 Chevrolet Impala, the PCM is typically located in the engine compartment on the driver’s side, housed within the air filter box assembly for protection.
Is this a new or used part?
This is a high-quality, tested, and guaranteed functional component sourced from a vehicle. It has been inspected and prepared to provide reliable service and is programmed with the most current software for your VIN.