Is Your GM Truck or SUV Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, the problem might be the very brain of your vehicle: the Powertrain Control Module (PCM). For a wide range of late 90s and early 2000s GM trucks, vans, and SUVs, a failing PCM can manifest as a host of confusing symptoms that are often misdiagnosed. This module, part number 8162634940, is the direct-fit, reliable solution to restore your vehicle’s performance and drivability.
From the Diagnostic Bay
We had a 1999 GMC Jimmy come into the shop that had its owner pulling his hair out. He’d replaced the throttle position sensor, the idle air control valve, and even the fuel pump based on advice from forums. The truck would still stall intermittently and shift harshly between first and second gear. After hooking up our scanner and seeing erratic data from multiple sensors, we suspected the PCM. We installed one of these VIN-programmed modules, performed the quick security relearn, and the Jimmy ran like it just rolled off the assembly line. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel mileage.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for your 1998-2000 Blazer S10 PCM
Don’t waste time and money at a dealership. We make the replacement process simple. This Powertrain Control Module is not just a part in a box; it’s a complete solution. When you place your order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then flash the module with the latest, most stable GM-certified software specific to your exact vehicle configuration. This critical step ensures that the module communicates perfectly with your engine, transmission, and all other onboard systems right out of the box.
This module is a direct replacement for several part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. By programming it to your VIN, we eliminate any compatibility guesswork. Once you receive the part, installation is straightforward. In most cases, you simply disconnect the battery, swap the modules, and reconnect the battery. You may need to perform a simple security relearn procedure, which can typically be done without special tools.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and the module will arrive ready for installation.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit serial number. You can typically find it on a metal 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.
Will I need to perform any other procedures after installation?
In many cases, you may need to perform a security relearn or a Crankshaft Variation (CASE) relearn. The security relearn allows the module to communicate with your key’s anti-theft system and can often be done by cycling the key. A CASE relearn helps the module detect misfires more accurately and may require a capable scan tool.
Is this a guaranteed fix for my vehicle’s problems?
While this PCM resolves the common symptoms listed, it’s crucial to ensure your vehicle has been properly diagnosed. A faulty PCM can mimic other issues, such as bad sensors or wiring problems. We recommend a thorough diagnosis by a qualified technician to confirm the PCM is the point of failure.
Does this part fit vehicles other than the Blazer/Jimmy?
Yes, absolutely. This module fits a very wide range of GM trucks, vans, and SUVs from the late 90s and early 2000s, including the Silverado, Sierra, Tahoe, Yukon, Express, Savana, and more. Please refer to the detailed fitment list on this page to confirm compatibility with your specific year, make, and model.