Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, harsh transmission shifting, or even a no-start condition in your late 90s or early 2000s GM vehicle, the culprit is often the main computer – the Powertrain Control Module (PCM). As the central command center for your engine and transmission, a failing PCM can cause a cascade of frustrating and difficult-to-diagnose problems. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and overall performance.
This replacement GM Powertrain Control Module, part number 16263494, is the definitive solution to restore your vehicle’s factory operation. It’s not just a part in a box; it’s a comprehensive service. We flash the module with the latest official GM software updates specifically calibrated to your vehicle using the VIN you provide. This ensures that any known bugs or drivability issues from the original factory programming are corrected, giving you performance that’s often better than new.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in with a complaint of intermittent stalling and a P0300 (Random Misfire) code that just wouldn’t go away. The owner had already replaced the plugs, wires, cap, and rotor. We checked fuel pressure and scanned for vacuum leaks—everything looked perfect. On a hunch, we monitored the injector pulse signals directly from the PCM. We found that the signal to cylinder 3 would occasionally drop out for a split second, just enough to cause a stumble but not long enough to set a specific injector circuit code. The issue wasn’t the injector; it was the driver circuit inside the old, failing PCM. Installing a correctly programmed module like this one solved the problem instantly. It’s a classic case where the symptoms point everywhere, but the root cause is the vehicle’s brain.
Symptoms of a Failing GM PCM
A faulty PCM can manifest in numerous ways. If your vehicle is experiencing any of the following, it’s time to consider a replacement:
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or unstable idling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ Failure to pass emissions testing.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for Your GM Powertrain Control Module
Replacing a PCM used to mean a trip to the dealership for expensive programming. Our process eliminates that hassle. By providing your Vehicle Identification Number (VIN) at checkout, you receive a module that is ready for installation right out of the box. The software is pre-loaded, matching all the specific options and systems your vehicle was built with. This is a direct-fit, OEM-spec component designed to seamlessly integrate with your vehicle’s electronics.
Key Benefits:
- ✔ VIN-Programmed: Arrives flashed with your vehicle’s specific calibration and the latest GM software updates.
- ✔ Direct Replacement: Engineered to replace part numbers 16263494, 16265035, and 8162634940.
- ✔ Restores Performance: Corrects common drivability issues caused by a failing computer, restoring lost power and efficiency.
- ✔ Broad Compatibility: Fits a wide range of popular GM trucks, vans, and SUVs from 1998-2002, including the S10, Blazer, Silverado, Sierra, Tahoe, Yukon, Express, and Savana. Please use the vehicle fitment tool to confirm compatibility.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to load the exact, correct software calibration from GM for your specific engine, transmission, and factory options. This ensures the module works perfectly upon installation without needing a trip to the dealer.
Is this part difficult to install?
Installation is straightforward for someone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in reverse order. The process usually takes less than an hour.
Will I need to do any additional programming after installation?
In most cases, no. The core engine and transmission programming is complete. However, on some GM vehicles, you may need to perform a simple, key-on/key-off security relearn procedure (often called Passlock or VATS relearn) which takes about 30 minutes and does not require any special tools. Instructions are readily available online for this procedure.
How do I know for sure my PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed. This includes checking for consistent power and ground at the PCM connector and ruling out sensor or wiring issues. If other components have been tested and confirmed good, the PCM is the most likely cause.
What part numbers does this module replace?
This module is a direct replacement for service numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787.