Is Your GM Truck or SUV Experiencing Frustrating Issues?
If your late 90s or early 2000s Chevrolet, GMC, or Isuzu is suffering from erratic behavior like harsh shifting, stalling, no-start conditions, or a persistent Check Engine Light, the root cause is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM governs everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose, leading to wasted time and money on unnecessary repairs.
From the Diagnostic Bay
We had a 1999 GMC Jimmy S15 come into the shop with what the owner was convinced was a failing transmission. It was shifting hard between 1st and 2nd gear and occasionally wouldn’t shift into overdrive. He had already spent a small fortune at a transmission shop that couldn’t find anything mechanically wrong. After plugging in our scanner, we noticed erratic data from the throttle position sensor and intermittent communication drops with the PCM. Instead of a costly transmission rebuild, the fix was a replacement Blazer S10 PCM. Once we installed the new, correctly programmed module, the transmission shifted perfectly. It’s a classic case of the vehicle’s ‘brain’ sending bad signals to a perfectly healthy component.
The Direct-Fit Solution for Your Vehicle
This Powertrain Control Module, service number 16265035, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by programming the module specifically for your vehicle using your unique Vehicle Identification Number (VIN). This ensures that all factory parameters, security information, and the latest GM software updates are correctly loaded before it even ships. The result is a simple, plug-and-play installation process that gets you back on the road quickly and confidently.
Common Symptoms of a Failing Blazer S10 PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle fails to start or has intermittent starting issues.
- ✔ Poor fuel economy and decreased engine power.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Issues with gauges or other electronic components.
Don’t let a faulty computer keep your reliable truck or SUV off the road. This module is a direct replacement for multiple part numbers, including 16263494 and 8162634940, and fits a wide array of popular GM models like the Chevy Silverado, GMC Sierra, Express/Savana vans, and more. Simply provide your VIN upon checkout, and we’ll handle the critical programming. Installation is straightforward, though some vehicles may require a simple security relearn procedure, which can typically be done without special tools.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because this PCM comes pre-programmed to your vehicle’s VIN, it is designed to be a plug-and-play installation. However, on many GM vehicles, you will need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn) to sync the new module with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and can be done without any special tools.
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 module until we receive this information, as the programming is essential for the part to function in your vehicle.
Is this compatible with part number 16263494?
Yes, this module is a direct, compatible replacement for several service numbers, including 16263494, 8162634940, 218-11787, and 21811787. It functions identically and is programmed with the same GM software.
Will this fix my transmission shifting problem?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift logic. If your vehicle is experiencing harsh shifts, delayed engagement, or failure to shift, and a mechanical fault has been ruled out, a failing PCM is a very likely culprit.
Where is the PCM located on my vehicle?
The location varies by model. On S10/S15 platform vehicles (Blazer, Jimmy, Sonoma), it is typically found in the engine bay on the passenger side fender. On full-size trucks and vans (Silverado, Sierra, Express), it’s often located on the driver’s side front of the engine compartment, sometimes under the battery tray.