Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, GMC Savana, or another compatible GM vehicle suffering from erratic behavior? Issues like a persistent check engine light, rough idling, stalling, poor fuel economy, or harsh transmission shifts can often be traced back to a failing Powertrain Control Module (PCM). This central computer is the brain of your vehicle’s engine and transmission, and when it falters, the entire driving experience is compromised. This replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s reliability and performance.
We had a 2001 Savana 2500 in the shop that was driving the owner crazy. It had a random misfire code that would come and go, and he had already replaced the plugs, wires, cap, and rotor twice. The van would run fine for a week, then suddenly start stumbling at idle. After checking fuel pressure and chasing sensor data for hours, we hooked up a scope to the injector drivers at the PCM. We found that the signal for cylinder 3 was intermittently dropping out. A new, properly programmed PCM fixed the issue instantly. It’s a classic case of a failing internal driver that no amount of external parts can fix.
The Hassle-Free Solution: A Pre-Programmed 1999-2002 Express 2500 PCM
Replacing a PCM used to mean a costly trip to the dealership for programming and security relearns. We’ve eliminated that step. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the latest, most stable software updates directly from GM. This ensures that the module you receive is perfectly matched to your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. It arrives ready for installation, making the repair process faster and more straightforward.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stumbling, misfiring, or running rough.
- ✔ Unexplained stalling or difficulty starting the engine.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for a wide range of GM trucks and vans from 1998 to 2002, including the Chevrolet Express, GMC Savana, Silverado, Sierra, Tahoe, and Yukon. It is compatible with multiple original equipment part numbers, including 16263494, 16265035, and 8162634940. Installation is typically straightforward, involving disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. In many cases, a simple security relearn procedure (often called a CASE learn or anti-theft relearn) is all that’s needed to get you back on the road.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during checkout, and we will flash the module with the latest GM software specific to your vehicle.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can typically find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a simple plug-and-play installation?
Yes, the physical installation is plug-and-play. However, after installation, you may need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure is simple and can usually be done without special tools. Instructions are widely available online or in service manuals.
How do I know if the PCM is really the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed. This can include checking for consistent trouble codes, testing sensor inputs and outputs, and verifying power and ground to the module. If other potential causes like sensors, wiring, and fuel delivery have been ruled out, the PCM is the likely culprit.
This part fits many vehicles. How can I be sure it’s right for mine?
The best way is to match the part number from your original module to one of the compatible numbers listed (16263494, 16265035, 8162634940). Even if the part number matches, providing your VIN for programming ensures it will function correctly for your specific vehicle’s options.