Restore Peak Performance to Your GM Workhorse
As a technician with two decades of experience under the hood, I’ve seen countless GM trucks and vans sidelined by frustrating, hard-to-diagnose electrical problems. More often than not, the culprit is a failing Powertrain Control Module (PCM). If your 1999-2002 Savana 2500 Van is experiencing erratic behavior like stalling, harsh shifting, or a persistent check engine light, you’ve found the reliable, straightforward solution. This isn’t just a replacement part; it’s a new lease on life for your vehicle’s engine and transmission management system.
This module, part number 16263494, is the brain of your vehicle, controlling everything from fuel mixture and ignition timing to transmission shift points. When it fails, it can create a cascade of issues that can be mistaken for a bad sensor or a faulty transmission. We eliminate the guesswork and the costly trip to the dealership. We flash this 1999-2002 Savana 2500 PCM with the latest official GM software updates, programmed specifically to your vehicle’s VIN. This ensures perfect communication between all onboard systems and restores the original factory performance and efficiency.
Case Study: The Ghost in the Machine
I remember a 2001 Express 2500 that came into the shop with a complaint of intermittent stalling at stop lights. The owner, a plumber, had already replaced the fuel pump and idle air control valve, but the problem persisted. No specific codes were stored, just a generic U0100 ‘Lost Communication’ code that would pop up occasionally. After checking all the grounds and wiring harnesses, we connected a scope to the PCM data lines. We saw the signal drop out randomly, confirming our suspicion. The original PCM was failing internally when it got hot. We installed a VIN-programmed module just like this one, and the van ran flawlessly. It saved the owner from more lost time and money chasing phantom problems.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in various ways. If you’re noticing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Common Diagnostic Trouble Codes (DTCs) like P0601, P0605, or U-series communication codes
- ✔ Engine stalling or cutting out for no reason
- ✔ Rough or inconsistent idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ The vehicle won’t start, but the battery and starter are good
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle in their own driveway. Our pre-programming service means you won’t need any special scan tools for the initial setup. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most Savana/Express vans, the PCM is in the engine compartment, on the driver’s side near the firewall or battery tray. On S-series trucks, it’s often on the passenger side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. There are usually two or three large multi-pin connectors. Inspect them for any corrosion or damaged pins.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new unit.
- Install the New PCM: Mount your new, VIN-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module. You should hear a ‘click’ as they lock into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In some cases, you may need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. We include instructions if this is required for your vehicle.
Verified to Fit These GM Models
This 1999-2002 Savana 2500 PCM is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number (16263494) or contact us with your VIN to confirm compatibility. This module is also a direct replacement for part numbers: 16265035, 8162634940, 218-11787, 21811787.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. It will arrive flashed with the latest GM software and coded to the VIN you provide, making it ready for installation right out of the box.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory calibration file for your specific vehicle. This ensures the PCM works correctly with your engine, transmission, and all factory-installed options for optimal performance and fuel economy.
Is this part difficult to install?
For most individuals with basic hand tools, this is a very manageable job. It typically involves disconnecting the battery, unplugging the old module, swapping it with the new one, and reconnecting everything. A security relearn procedure may be needed, but it does not require special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift logic. If the module is failing, it can cause harsh shifts, delayed engagement, or incorrect gear selection. Replacing a faulty PCM often resolves these types of transmission issues.
What if my original part number is different?
This module is a direct replacement for several part numbers, including 16265035 and 8162634940. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.