Restore Peak Performance to Your GM Truck or SUV
If you’re dealing with frustrating and unpredictable issues like stalling, erratic shifting, a persistent check engine light, or even a no-start condition, the problem often traces back to a failing Powertrain Control Module (PCM). As the electronic brain of your vehicle, a faulty PCM can wreak havoc on performance and reliability. I’ve spent countless hours in the shop diagnosing these exact symptoms on late 90s GM vehicles, and a correctly programmed PCM is the definitive fix. This isn’t just a replacement part; it’s a solution that restores your vehicle’s core functionality.
This module, part number 16263494, is meticulously prepared for your specific vehicle. We handle the complex part for you: before shipping, we flash the module with the latest official GM software updates using the VIN you provide. This ensures perfect communication between your engine, transmission, and other systems, eliminating the need for an expensive trip to the dealership for programming. This is the most direct path to getting your 1998-2000 Blazer Jimmy PCM functioning like new again.
A Technician’s Notebook: The Phantom Fuel Pump Problem
A customer brought in his ’99 GMC Jimmy, convinced the fuel pump was bad. It would crank but not start intermittently. He’d already replaced the pump himself, but the problem persisted. Instead of just throwing another part at it, I connected my scan tool. I wasn’t getting any communication with the PCM. After checking the power and ground feeds to the module—which were good—I knew where the problem was. The PCM’s internal driver for the fuel pump relay had failed. We installed one of our VIN-programmed PCMs, performed the quick security relearn, and the truck fired up instantly. It’s a classic case where diagnosing the ‘brain’ first saved the customer from more wasted time and money.
Is Your Truck or Van Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your module may need replacement:
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601 or P0605 (Internal Control Module Memory Check Sum Error).
- ✔ Vehicle refuses to start or stalls unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Poor fuel economy and engine performance.
- ✔ No communication with the PCM when using a diagnostic scan tool.
- ✔ Issues with spark or fuel injector operation.
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle in under an hour. Since we program it beforehand, no special tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most S10/Blazer/Jimmy models, the PCM is located in the engine bay on the passenger side firewall or inner fender. On vans and full-size trucks, it may be on the driver’s side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. There are typically multiple color-coded connectors; they only fit one way, so you can’t mix them up.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and set it aside. Secure the new module in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This usually involves turning the key to the ‘ON’ position for 10-15 minutes. We include simple instructions for this process.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16263494 and is compatible with other numbers such as 16265035, 8162634940, 218-11787, and 21811787. It fits a wide range of GM vehicles. Please verify your vehicle is on the list below.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software calibration for your truck’s engine, transmission, and options. This ensures a seamless, plug-and-play installation without needing a dealer.
Is this a difficult part to install myself?
Not at all. The physical swap is simple, involving a few bolts and electrical connectors. The only other step is a security relearn procedure, which just requires turning the key and waiting. Instructions are included.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606), then yes, this module is the correct fix. However, you should always diagnose other codes (like O2 sensor or EVAP codes) first, as the PCM can’t fix a separate faulty sensor.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system so the engine will start. It typically involves leaving the ignition key in the ‘ON’ position for about 10-15 minutes until the security light on the dash turns off. We provide clear, step-by-step instructions.