Restore Your Van’s Core Performance and Reliability
If your 1999-2002 GMC Savana 2500 Van is giving you headaches with unpredictable stalling, a persistent Check Engine Light, or erratic transmission shifting, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM manages everything from fuel injection and spark timing to transmission shift points. When it starts to fail, it can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it’s a reliability problem that can leave you stranded.
This replacement PCM, part number 16265035, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module specifically for your vehicle using your VIN. This means it arrives loaded with the latest GM factory software updates, often correcting underlying drivability issues that even the original module had from the factory. It’s a true plug-and-play fix that restores your van’s original performance and efficiency without a costly trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I remember a 2001 Express 2500 work van that came into my bay with a complaint of intermittent stalling at stoplights and a weird, delayed 1-2 shift only when cold. The owner had already replaced the fuel filter and a couple of sensors with no luck. We scanned it and found no hard codes, just a history of communication loss faults. After checking the wiring harness for chafing (a common issue on these vans), we suspected the PCM itself. The internal processors can degrade over time, causing these ghost-like problems. We installed one of these VIN-programmed modules, and the van ran perfectly. The updated software even smoothed out the cold shift. It’s a reminder that sometimes the ‘brain’ is the root cause, not the sensors it’s reading.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Unexplained Check Engine Light illumination
- ✔ Stalling, stumbling, or rough idling
- ✔ Harsh or incorrect transmission shifting
- ✔ A significant drop in fuel economy
- ✔ The engine won’t start, but the battery and starter are good
- ✔ Failed emissions test
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0605, or U0100
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. With basic hand tools, you can get your vehicle back on the road in under an hour. Our pre-programming makes this a simple component swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment on the driver’s side, near the battery or firewall. It’s a metal box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are typically release tabs that need to be pressed or lifted. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical connectors, ensuring they click and lock securely.
- Final Step: Reconnect the negative battery terminal. The vehicle may need to run for a few minutes to complete its internal relearn processes.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It fits a wide range of GM trucks and vans. Please verify your vehicle from the list below:
CHEVROLET EXPRESS / GMC SAVANA VANS 1500/2500/3500 (1999-2002)
CHEVROLET ASTRO / GMC SAFARI (1999-2001)
CHEVROLET S10 / GMC SONOMA (1998-2000)
CHEVROLET BLAZER / GMC JIMMY (1998-2000)
CHEVROLET TAHOE / GMC YUKON (1999-2000)
CADILLAC ESCALADE (1999-2000)
ISUZU HOMBRE (1998-2000)
OLDSMOBILE BRAVADA (1998-2000)
GMC ENVOY (1998-2000)
CHEVROLET/GMC SUBURBAN (1999)
Note: Please match your part number or message us with your VIN to confirm 100% compatibility.
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. This is the main benefit of our service. We flash the module with the latest GM software using the VIN you provide, so it arrives ready to install right out of the box.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Will this fix my transmission problems?
In many cases, yes. The PCM controls transmission line pressure and shift solenoids. If the module is faulty, it can cause poor shifting, hunting for gears, or getting stuck in one gear. A new PCM often resolves these issues.
Is this a simple DIY job?
Yes, for most people with basic mechanical skills. The module is typically easy to access and only requires unbolting the old one and plugging in the new one. No special tools are needed.
What happens after I install it?
After reconnecting the battery, start the vehicle. It may idle slightly differently for a few minutes as it completes a relearn procedure. A short test drive will allow the computer to fully adapt.