Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, GMC Savana, or another GM vehicle from the late 90s and early 2000s suffering from baffling electrical or performance issues? A faulty Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, the PCM manages everything from fuel delivery and spark timing to transmission shift points and emissions controls. When it fails, it can lead to a host of problems that can sideline your vehicle. This replacement module is the definitive solution to get your truck or van operating reliably once again.
The Brain of Your Vehicle’s Operation
Think of the PCM as the mission control center for your powertrain. It constantly receives data from sensors throughout the engine and transmission, makes millions of calculations per second, and sends precise commands to actuators like fuel injectors and ignition coils. A failing module can misinterpret data or send incorrect commands, leading to symptoms that range from annoying to critical. Replacing a faulty unit is essential for restoring fuel efficiency, power, and smooth operation.
From the Diagnostic Bay
We had a 2001 GMC Savana 2500 work van come into the shop with a complaint of intermittent stalling and a persistent Check Engine Light. The driver explained that it would run fine for days, then suddenly die at a stoplight and refuse to restart for 10-15 minutes. We checked fuel pressure, ignition components, and scanned for codes, but everything seemed intermittent. After chasing our tails, we hooked up a scope to the PCM’s power and ground circuits. We found that the module’s internal voltage regulator was failing when it got hot, causing the processor to shut down. We installed a VIN-programmed Express 1500 Powertrain Control Module, performed the security relearn, and the van was back on the road, reliable as ever. It’s a classic case of a failing computer causing phantom mechanical symptoms.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module could be the root cause:
- ✔ Check Engine Light: The light is on, often with communication error codes (like P0600-P0606) or multiple seemingly unrelated sensor codes.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: Your vehicle is suddenly using more fuel than usual without a change in driving habits.
- ✔ Transmission Issues: Harsh shifting, delayed engagement, or getting stuck in one gear (limp mode).
- ✔ Intermittent or No-Start Conditions: The engine cranks but won’t start, or it starts unreliably.
- ✔ Stalling: The engine stalls unexpectedly while driving or when coming to a stop.
A True Plug-and-Play Solution
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. We take the guesswork out of the repair. When you purchase this Express 1500 Powertrain Control Module, we use the Vehicle Identification Number (VIN) you provide to flash the unit with the latest, most up-to-date software directly from GM. This ensures that all parameters for your specific engine, transmission, and emissions equipment are perfectly calibrated. The module arrives at your door ready for installation, saving you time and money.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940, and fits a wide array of GM vehicles. Please verify the extensive fitment list to confirm compatibility with your specific truck or van.
Frequently Asked Questions
Do I need to program this module?
No. We program the module for you before it ships. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash it with the correct factory software for your specific application.
What happens if I don’t provide a VIN?
Providing your VIN is mandatory for this part. We cannot ship the module without programming it, as it will not function in your vehicle. The programming process ensures compatibility and proper operation of your engine and transmission.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first, as the light can be triggered by many other failing components like sensors or wiring.
Is a security relearn procedure required after installation?
In many cases with these specific GM vehicles, a simple security relearn procedure is necessary to sync the new PCM with your vehicle’s anti-theft system. This procedure, often called the “Passlock Relearn,” can typically be done without special tools and involves a sequence of key turns. Instructions are widely available online for your specific model.
Where is the PCM located on my vehicle?
The location varies by model. On Express and Savana vans, it’s typically in the LH rear of the engine compartment. On pickups like the Silverado and Sierra, it’s often on the driver’s side front of the engine compartment, sometimes under the battery tray. On S10/Blazer models, it’s commonly on the passenger (RH) side of the engine compartment. Always disconnect the battery before removal or installation.