Restore Peak Performance to Your GM Van or Truck
Is your workhorse Express Van or trusty Silverado suddenly giving you trouble? Erratic shifting, a persistent check engine light, or even a frustrating no-start condition can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the electronic brain of your vehicle, the PCM governs everything from fuel mixture and ignition timing to transmission shift points. When it fails, the symptoms can be widespread and confusing. This isn’t just an inconvenience; it’s a hit to your productivity and peace of mind.
This replacement Powertrain Control Module is the definitive solution for a wide range of GM trucks and vans, including the 1999-2002 Express 3500 Van. PCM failure is a common issue I’ve seen countless times over my 20+ years in the shop. This module is your direct path to a reliable repair. We take the guesswork and high costs out of the equation by professionally programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it arrives ready for installation, loaded with the latest GM software updates for optimal performance and efficiency.
From the Diagnostic Bay: The Case of the Stalling Work Van
I remember a 2001 Express 3500 that came into my bay a few years back. The owner, a local plumber, was at his wit’s end. The van would run fine for a while, then suddenly stall at a stoplight. No specific codes were stored initially, just intermittent chaos. Other shops had replaced the fuel pump and ignition coil, but the problem persisted. After hooking up my scan tool and monitoring live data, I noticed the PCM was intermittently losing communication and commanding the fuel injectors to shut off for no reason. It was a classic internal PCM fault, often triggered by heat soak. We installed a VIN-programmed module just like this one, performed the quick security relearn, and that van was back on the road reliably the same day. It’s a perfect example of how the right part, correctly prepared, solves the problem the first time.
Is Your Vehicle Showing These Symptoms?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty PCM could be the culprit. These are the issues that bring drivers to my shop most often.
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Fault) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Poor fuel economy and decreased engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling or rough idling for no apparent reason.
- ✔ Communication errors with your OBD-II scan tool.
A Straightforward Guide to Your PCM Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle with basic tools. Our pre-programming service eliminates the need for expensive dealer tools. Follow these steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the Old PCM: On most Express/Savana vans, the PCM is located in the engine compartment on the driver’s side, near the rear. On pickups like the Silverado or Sierra, it’s typically on the driver’s side fender well, under the hood near the battery.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Module: Unbolt the old PCM from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect your vehicle’s negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows your vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following GM, Chevrolet, Isuzu, and Oldsmobile models. Please verify your vehicle is on this list to ensure proper fitment.
GMC SAVANA 3500 VAN 99-02 (Gasoline)
CHEVROLET SILVERADO 1500 PICKUP 99-00 (6 cylinder)
GMC SIERRA 1500 PICKUP 99-00 (6 cylinder)
CHEVROLET TAHOE 99-00
GMC YUKON 99-00
CADILLAC ESCALADE 99-00
CHEVROLET S10/S15/SONOMA 98-00 (4.3L)
CHEVROLET BLAZER / GMC JIMMY 98-00
CHEVROLET ASTRO / GMC SAFARI 99-01
… and many more models listed in the compatibility chart.
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming involves loading your vehicle’s specific software and settings onto the module using your 17-digit Vehicle Identification Number. This ensures the PCM works perfectly with your engine, transmission, and options, avoiding the need for a costly trip to the dealership.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function.
Do I need to do anything else after installing this PCM?
In most cases, you will need to perform a simple ‘security relearn’ procedure, which syncs the new module with your vehicle’s anti-theft system. Instructions are readily available online for your specific model and typically involve a sequence of key turns. Some vehicles may also require a Crankshaft Position Sensor (CASE) relearn, which can be done with many mid-range scan tools.
Is this a reliable part?
Absolutely. Each module is thoroughly inspected and tested to meet or exceed original equipment specifications. We then program it with the latest stable software from GM to ensure maximum reliability and performance for your vehicle.
What if my original part number is slightly different?
This module is compatible with several part numbers, including 16263494, 16265035, and 8162634940. As long as your vehicle is on the compatibility list and you provide your VIN, we will ensure the module is correctly programmed for a perfect match.