Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, harsh transmission shifting, or even a no-start condition, the problem might not be a faulty sensor or mechanical part. The Powertrain Control Module (PCM), the central computer of your vehicle, could be the culprit. For a wide range of GM trucks and vans from 1998 to 2002, a failing PCM can manifest in confusing ways, often leading to incorrect diagnoses and expensive, unnecessary repairs. This module, part number 16263494, is the direct-fit, reliable solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We once had a 2001 Chevy Express van come in that had its owner pulling his hair out. He’d replaced the throttle position sensor, the mass airflow sensor, and even the fuel pump based on various codes and advice. The van still shifted hard from first to second and would occasionally stall at idle. After confirming all the new parts were working correctly, we hooked up our diagnostic scanner and monitored the live data from the PCM. We saw erratic voltage readings and slow command responses that pointed directly to an internal module failure. We installed a VIN-programmed PCM, performed the security relearn, and the van ran like it just rolled off the factory floor. The customer was thrilled to finally have a real solution after wasting hundreds on parts he didn’t need.
The Importance of a Correctly Programmed 1999-2002 Savana PCM
You can’t simply take a PCM from another vehicle and expect it to work. Each module is programmed with software specific to your vehicle’s Vehicle Identification Number (VIN). This programming dictates critical parameters like fuel delivery, ignition timing, transmission shift points, and anti-theft system operation. Our service eliminates the guesswork and the need for an expensive trip to the dealership. When you order from us, we flash the module with the latest GM-certified software updates for your exact VIN. This ensures that your vehicle operates precisely as the manufacturer intended, often correcting factory bugs you didn’t even know you had.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Poor fuel economy and decreased engine power.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Issues with other electronic systems, as the PCM communicates with multiple modules.
Simple Installation Process
Replacing your 1999-2002 Savana PCM is a straightforward process. After disconnecting the vehicle’s battery, you simply locate the old module (often in the engine bay on the driver’s side), unplug the wiring harnesses, unbolt it, and install the new one in its place. Once connected, you will likely need to perform a security relearn procedure (often called a CASE relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure is simple and can typically be done without special tools. Instructions are readily available online or in your vehicle’s service manual.
This module is a direct replacement for part numbers: 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your part number and check the extensive fitment list to ensure compatibility with your specific make, model, and year.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the correct software for your specific vehicle.
Where is the PCM located on my vehicle?
The location varies slightly. On most Express and Savana vans, it’s in the LH rear engine compartment. On pickups like the Silverado and Sierra, it’s typically on the LH side of the engine compartment, sometimes under the battery tray. On S10/Blazer models, it’s often on the RH side.
What is a security or CASE relearn?
This is a procedure that syncs the new PCM to your vehicle’s existing anti-theft system and crankshaft position sensor. Without it, your vehicle may not start. It’s a simple process that usually involves turning the key to the ‘ON’ position for a set amount of time. A professional scan tool may be required for the crankshaft variation (CASE) relearn to clear certain trouble codes.
How do I provide my VIN?
You can add your 17-digit VIN to the notes section at checkout or send it to us in a message after you place your order. We cannot ship your part until we have your VIN to program it.
Is this part compatible with my vehicle?
This PCM fits a very wide range of GM trucks and vans from approximately 1998 to 2002. Please review the detailed fitment list on this page and match your original part number (16263494 or one of the alternates) to ensure you are ordering the correct component.