Is Your GM Truck or Van Experiencing Drivability Issues?
If your Chevrolet Express, Silverado, GMC Savana, or other compatible GM vehicle is suffering from a persistent check engine light, erratic shifting, stalling, or a no-start condition, the problem may lie with its central command center: the Powertrain Control Module (PCM). As the brain of your vehicle’s engine and transmission, a failing PCM can cause a wide range of frustrating and difficult-to-diagnose problems. It controls everything from fuel injection and spark timing to transmission shift points and emissions systems. When it fails, your vehicle’s performance and reliability suffer dramatically.
The Plug-and-Play Solution: A Pre-Programmed PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine OEM electronic control module and flash it with the latest, most up-to-date software from General Motors, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This critical programming service means you can bypass a costly trip to the dealership for flashing. Your new PCM arrives ready for installation, ensuring that all factory parameters for your specific engine, transmission, and options are perfectly loaded.
From the Diagnostic Bay
We once had a 2001 GMC Sierra in the shop with a classic ‘bad PCM’ complaint. The engine would crank but never start, and the owner had already replaced the fuel pump and crank sensor. A quick scan showed no communication with the PCM. Before condemning the expensive module, we did a simple check. We followed the main ground strap from the battery to the engine block and found it was green with corrosion and barely hanging on. After cleaning the contact points and tightening the bolt, the truck fired right up. Always check your main power and ground connections before replacing a computer—it can save you hundreds of dollars!
Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with internal module fault codes (e.g., P0600-P0606).
- ✔ The engine cranks but will not start, even with good fuel pressure and spark.
- ✔ Unexplained stalling, rough idling, or hesitation during acceleration.
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy and overall engine performance.
- ✔ Inconsistent operation of electronic components like fuel injectors or cooling fans.
- ✔ Failure to communicate with a diagnostic scan tool.
Guaranteed Fitment for Your 1999-2002 Express 1500 PCM
This module, part number 16263494, is a direct replacement for a wide array of GM trucks and vans from the late 1990s and early 2000s. By providing us with your VIN, we ensure this part is 100% compatible with your vehicle’s systems. It directly replaces part numbers 16263494, 16265035, 8162634940, and more. Restore your vehicle’s original performance and reliability with a component that is built to last and programmed for precision.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your truck or van.
Is this installation difficult? Can I do it myself?
Installation is straightforward for most DIY mechanics. It involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and installing the new one. After installation, you will need to perform a simple security relearn procedure (often called a CASE learn or Passlock relearn), which typically involves turning the key on and off in a specific sequence. Instructions are readily available online for this procedure.
Where is the PCM located on my vehicle?
The location varies slightly by model. On Express and Savana vans, it’s typically in the engine compartment on the driver’s side, near the rear. On pickups like the Silverado and Sierra, it’s usually found in the engine bay on the driver’s side, near or under the battery tray.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first. Other failing sensors or wiring issues can sometimes mimic PCM failure. We recommend confirming the diagnostic trouble codes point to a faulty module before ordering.
What information do you need from me?
The only thing we need is your 17-digit Vehicle Identification Number (VIN). This allows us to access the correct factory software file from GM and ensure the module is a perfect match for your vehicle’s configuration.