Is Your GM Truck or Van Running Rough?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle’s engine and transmission. It manages everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, it can cause a wide range of confusing and frustrating problems that can be difficult to diagnose. This direct-fit PCM is the definitive solution for a wide range of GM vehicles, including the Chevrolet Express, Silverado, Tahoe, and GMC Sierra, restoring your vehicle’s performance, reliability, and fuel efficiency.
From the Diagnostic Bay
We had a 2001 Savana van come in that was driving the owner crazy. It had a random misfire, would occasionally stall at red lights, and the transmission shifted harshly between first and second gear. The owner had already replaced the spark plugs, wires, and even the crankshaft position sensor based on some generic trouble codes. The problems persisted. After hooking up our professional scan tool and monitoring live data, we noticed the PCM’s internal voltage regulators were fluctuating erratically. The PCM itself was the culprit, causing faulty signals to be sent and received. We installed a VIN-programmed module just like this one, performed the quick security relearn, and the van ran like it just rolled off the factory floor. It’s a classic case of chasing symptoms when the root cause is the vehicle’s brain.
The Simple, Reliable Solution: A VIN-Programmed 1999-2002 Express PCM
Don’t settle for a used module from a salvage yard that could have the same issues as your current one, or worse, be incompatible with your vehicle’s specific options. We take the guesswork out of the repair. When you purchase this module, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We then use that VIN to load the latest, most updated OEM software directly from GM for your exact vehicle configuration. This ensures perfect compatibility and function right out of the box.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Engine stalls, stumbles, or runs rough.
- ✔ Vehicle won’t start, or is very difficult to start (no-start condition).
- ✔ Noticeable decrease in fuel economy (MPG).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Replacing your faulty 1999-2002 Express PCM with our pre-programmed unit is the most effective way to solve these issues permanently. This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787, guaranteeing a perfect fit and function for the extensive list of compatible vehicles.
Installation Process
Installation is straightforward. After physically swapping the module, some vehicles will require a security relearn procedure, also known as a Passlock or VATS relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and your existing keys. This can typically be done without special tools and involves a series of key cycles. Instructions are readily available online or in service manuals for your specific model. In some cases, a Crankshaft Variation (CASE) relearn may be needed to clear a P1336 trouble code, which requires a capable bidirectional scan tool.
Frequently Asked Questions
Do I need to program this module?
No. This module comes fully programmed to your vehicle using the VIN you provide during checkout. It is ready for installation upon arrival.
What information do you need from me?
We only need your vehicle’s 17-digit VIN. You can typically find this on your driver’s side dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.
Is a security relearn procedure difficult?
For most GM vehicles of this era, the security relearn is a simple procedure that involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this cycle three times. It requires no special tools, just a little patience.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this part will resolve the issue. It’s crucial to ensure the PCM is the root cause and not another sensor or wiring problem.
Is this compatible with part number 16263494?
Yes, this module is a direct, cross-compatible replacement for several part numbers, including 16263494, 16265035, 8162634940, and 218-11787. It will function identically to the original part.