Is Your GM Van or Truck Experiencing Mysterious Issues?
If your 1999-2002 Chevrolet Express, GMC Savana, or other compatible GM vehicle is suffering from stalling, poor fuel economy, erratic shifting, or an illuminated Check Engine Light, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can create a cascade of frustrating and difficult-to-diagnose problems. Don’t let a failing module keep your reliable workhorse off the road. This direct-replacement PCM is the definitive solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We once had a 2001 Savana 2500 work van in the shop with a complaint of intermittent stalling at stoplights and a strange ‘bucking’ sensation at highway speeds. The Check Engine Light would come on and go off randomly, and no consistent trouble codes were stored, making it a diagnostic nightmare. After verifying fuel pressure, ignition components, and sensor readings, we finally connected an oscilloscope to the PCM outputs. We discovered erratic signals controlling the fuel injectors. A replacement PCM, programmed to the van’s VIN, solved the problem completely. The owner was thrilled to have his reliable workhorse back on the road without the constant worry of a breakdown.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine stalling, misfiring, or running rough
- ✔ Harsh, delayed, or incorrect automatic transmission shifting
- ✔ A noticeable decrease in fuel economy
- ✔ Complete no-start or intermittent starting conditions
- ✔ Failure to pass state emissions inspections
- ✔ Communication errors with diagnostic scan tools
Your Reliable 1999-2002 Express 2500 PCM Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We eliminate the need for expensive dealership visits for programming. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable OEM software updates from General Motors, ensuring it is perfectly matched to your vehicle’s specific configuration. This critical step guarantees proper engine, transmission, and emissions system operation.
This process ensures that your new 1999-2002 Express 2500 PCM corrects underlying software glitches that may have existed in the original unit, leading to improved performance and longevity. It is compatible with a wide range of GM trucks and vans from this era, including the Chevrolet Silverado, GMC Sierra, S10/Sonoma, Tahoe, and more. Please verify your original part number against our cross-reference list (16263494, 16265035, 8162634940) or confirm fitment with your VIN.
Installation and Security Relearn
Installation is a straightforward process of disconnecting the battery, unplugging the electrical connectors from your old PCM, removing it, and installing the new one. However, please be aware that most GM vehicles of this period require a security relearn procedure after the new module is installed. This syncs the new PCM with your vehicle’s anti-theft system (like Passlock) and may also require a Crankshaft Variation (CASE) relearn. These procedures can often be done without specialized tools and are necessary for the vehicle to start and run correctly.
Frequently Asked Questions
What is the difference between a PCM and an ECM?
ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. For most vehicles like the Express van, the PCM is a single unit that controls both the engine and the transmission. The terms are often used interchangeably for this application.
Do I need to have this module programmed?
No, we handle the programming for you before shipment! Just provide your VIN at checkout, and the module will arrive with the correct software for your vehicle, ready for installation.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system. Without it, the vehicle may not start. The procedure typically involves a sequence of turning the ignition key on and off for set periods. Instructions are widely available online for your specific model.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this part will resolve the issue. It’s crucial to ensure that the problem isn’t with a sensor or another component that the PCM is monitoring.
How do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.