Is your 2001-2002 Buick Century suffering from baffling engine problems, erratic shifting, or a sudden refusal to start? These frustrating issues often point to a single culprit: a failing Powertrain Control Module (PCM). As the central computer for your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems that can be difficult to diagnose. This replacement module, part number 12202600, is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
This isn’t just a part in a box. We provide a complete, ready-to-install solution. Before we ship your module, we flash it with the latest GM-certified software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures seamless communication between the module and all other systems in your car, eliminating the need for an expensive trip to the dealership for programming. You get a component that is truly plug-and-play, designed to get you back on the road quickly and confidently.
From the Diagnostic Bay
We had a 2002 Buick Century come into the shop with a complaint of intermittent stalling at stoplights and a harsh 1-2 shift. The check engine light was on, but the codes were all over the place—from O2 sensor faults to random misfires. The owner had already replaced plugs, wires, and a coil pack with no improvement. After running a full diagnostic, we noticed the PCM was intermittently dropping communication with our scan tool. We connected a lab scope and confirmed the 5-volt reference signal was fluctuating wildly. We installed one of our VIN-programmed PCMs, performed a quick security relearn, and the car ran like new. It’s a classic case of how a failing computer can send you chasing mechanical ghosts, when the real problem is electronic.
Diagnosing a Faulty 2001-2002 Century Powertrain Module
A failing PCM can manifest in numerous ways, often mimicking other mechanical or sensor failures. If you’re experiencing any of the following symptoms, your engine computer may be the root cause. This module is the direct solution for these common electronic failures.
- âś” Check Engine Light: The check engine light is illuminated, often with communication-related trouble codes (U-codes) or multiple, seemingly unrelated sensor codes.
- âś” Poor Engine Performance: You may notice a significant loss of power, rough idling, engine stumbling, or hesitation during acceleration.
- âś” Reduced Fuel Economy: A malfunctioning PCM cannot efficiently manage the engine’s fuel delivery, leading to a noticeable drop in MPG.
- âś” Erratic Transmission Shifting: The PCM also controls transmission functions. You might experience harsh shifts, delayed engagement, or getting stuck in a single gear (limp mode).
- âś” Intermittent Stalling: The engine may stall for no apparent reason, either while driving or when coming to a stop.
- âś” No-Start Condition: In cases of complete failure, the PCM may not be able to activate the fuel pump or ignition coils, preventing the engine from starting at all.
- âś” Failed Emissions Test: Incorrect air/fuel mixture control will almost certainly lead to a failed smog or emissions inspection.
This unit is a direct replacement for original part numbers 12202600, 12209614, and 09360210 and fits a wide range of GM vehicles from the era, including the Oldsmobile Alero, Pontiac Grand Am, Chevrolet Impala, and many more. By providing us with your VIN, you guarantee that the module you receive is perfectly matched to your vehicle’s specific configuration and options.
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your car’s main computer, responsible for managing the engine and transmission. It takes data from dozens of sensors to control fuel injection, ignition timing, emissions systems, and automatic transmission shift points to ensure optimal performance, fuel economy, and low emissions.
Do I need to program this module?
No! That’s the primary benefit of our service. We program the module for you using your vehicle’s VIN before it ships. This means it will be ready for installation right out of the box, saving you the time and expense of a dealership visit.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific car. It contains information about the make, model, engine, transmission, and factory-installed options. We use the VIN to load the exact, correct software from GM’s database onto your new PCM, ensuring perfect compatibility.
Will this fix my car’s specific problem?
This module will correct any issues directly caused by a failing PCM. While the symptoms listed are strong indicators of a bad PCM, we always recommend a thorough diagnosis by a qualified mechanic to rule out other potential causes like faulty wiring or sensors before ordering.
Where is the PCM located on a 2001-2002 Buick Century?
On the 2001-2002 Buick Century, the Powertrain Control Module is typically located in the engine compartment on the left-hand (driver’s) side, often inside the air filter housing for protection and cooling.
What is the difference between a PCM, ECM, and ECU?
ECU (Electronic Control Unit) is a generic term for any vehicle computer. ECM (Engine Control Module) specifically controls the engine. PCM (Powertrain Control Module) is an integrated unit that controls both the engine and the transmission. For your Buick Century, PCM is the correct term.