Is your GMC Envoy, Chevy S10, or another compatible GM truck experiencing perplexing issues like erratic shifting, poor fuel economy, a no-start condition, or a persistent Check Engine Light? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the root cause. This replacement PCM, part number 16263494, is the definitive solution to restore your vehicle’s performance, reliability, and drivability. It arrives at your door fully programmed to your specific Vehicle Identification Number (VIN), ensuring a seamless integration with your truck or van’s systems.
The PCM is responsible for managing a complex web of operations, from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, the symptoms can be widespread and often misdiagnosed as individual sensor or mechanical failures, leading to costly and unnecessary repairs. By replacing a faulty module with this quality-tested unit, you are addressing the core of the problem, not just the symptoms. We flash the module with the latest GM-certified software updates, which can often resolve factory bugs and improve overall engine and transmission performance beyond its original state.
From the Diagnostic Bay
We had a 1999 Chevy Blazer come in that the owner was convinced needed a new transmission. It was shifting hard, sometimes getting stuck in gear, and throwing a couple of transmission solenoid codes. He had already replaced two of the solenoids himself with no change. After hooking up our scanner and monitoring the live data, we noticed the PCM wasn’t sending consistent voltage signals to the transmission. Instead of a $2,000 transmission job, we installed a VIN-programmed PCM like this one. After a quick CASE relearn, the truck shifted perfectly. The issue was never mechanical; it was the brain telling the transmission the wrong thing.
Solving Issues with the 1998-2000 Envoy PCM
A failing PCM on these GMT platforms can be a headache for any owner or technician. Our process eliminates the guesswork and the need for expensive dealership programming. Simply provide your VIN during checkout, and our technicians will handle the complex flashing process. This ensures that the module communicates correctly with your vehicle’s security system (Passlock/VATS), gauges, and other electronic components right out of the box. This specific module is a direct replacement for part numbers 16263494, 16265035, and 8162634940, covering a wide range of popular GM vehicles from that era.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs).
- ✔ Vehicle fails to start or starts intermittently.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Engine stumbling, stalling, or misfiring.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Gauges on the instrument cluster behaving erratically.
Don’t let a faulty computer keep your reliable GM truck off the road. This is a straightforward, effective repair that restores the precise electronic control your vehicle needs to run its best. Order today, provide your VIN, and get ready to experience a smoother, more reliable ride.
Frequently Asked Questions
Do I need to program this module?
No. This module comes pre-programmed to your vehicle’s VIN. Simply provide us with your VIN after purchase, and we will flash the unit with the latest GM software before shipping it to you.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information.
What is a CASE relearn and will I need to do one?
A Crankshaft Variation Relearn (CASE) procedure may be required after installation to sync the new PCM with your engine’s crankshaft position sensor. This prevents a P1336 trouble code. Many mid-level diagnostic scan tools can perform this procedure in a few minutes.
Is this a simple plug-and-play installation?
For the most part, yes. Once programmed, you simply disconnect the battery, swap the old module with the new one, and reconnect the battery. However, you may also need to perform the CASE relearn and a security relearn procedure, which can typically be done without special tools. Instructions can be provided upon request.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift points. If your module is failing, it can cause a wide range of shifting issues that mimic mechanical transmission failure. This part is often the correct fix for such electronic issues.