Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC, Chevy, or Isuzu suddenly running rough, stalling unexpectedly, or throwing a stubborn Check Engine Light? Before you start throwing expensive parts at the problem, the issue might be the very brain of your vehicle: the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen countless drivability issues traced back to a failing PCM. This isn’t just a part; it’s the central command center for your engine and transmission. This replacement PCM is your direct, reliable solution to get your vehicle running smoothly and efficiently again.
From the Diagnostic Bay: The Case of the Intermittent Stall
A customer brought in his ’99 Silverado 1500 with a frustrating problem: it would randomly stall at stoplights, but not always. No specific codes were stored, just a history of random misfires. We checked fuel pressure, spark, and sensors—all were fine. These intermittent electrical gremlins are the toughest to solve. Based on experience with these GMT400 and GMT800 platforms, I suspected the PCM. Heat soak and years of vibration can cause internal solder joints to fail. We swapped in a pre-programmed PCM like this one, and the problem vanished instantly. It’s a reminder that sometimes the most complex problems have a straightforward, central solution.
Is Your Vehicle Showing These Signs of PCM Failure?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0604, or P0606
- ✔ Unexplained stalling or rough idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A complete no-start condition where the engine cranks but won’t fire
- ✔ Poor fuel economy
- ✔ Communication errors with your scan tool
Why Choose a Pre-Programmed Module?
The biggest hurdle in replacing a modern vehicle’s computer is the programming. This 1999-2000 GMC 2500 PICKUP PCM arrives at your door ready to install. We take your vehicle’s VIN and flash the module with the latest, most stable software directly from GM. This critical step ensures all components communicate correctly and your engine operates at peak efficiency. You get to skip the expensive trip to the dealership for programming, saving you both time and hundreds of dollars in labor fees.
A Straightforward Guide to PCM Installation
Replacing the PCM on these GM trucks and vans is a job most DIYers can handle in their own driveway with basic tools. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most of these trucks (like the GMC 2500 Pickup) and vans, the PCM is located in the engine bay, typically on the driver’s side fender, near the battery or airbox. It’s a silver metal box with multiple large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that may need to be slid or squeezed to release. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical connectors, ensuring they click and lock securely. A poor connection is a common source of post-install issues.
- Reconnect the Battery: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn (If Needed): Your vehicle may enter anti-theft mode and not start initially. To resolve this, perform the simple security relearn procedure: Turn the key to the ‘ON’ position (don’t start) for 10-15 minutes, then turn it ‘OFF’ for 10 seconds. Repeat this cycle 2-3 times. The vehicle should then start and run normally.
Will This Fit My GM Vehicle?
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. It is guaranteed to fit the following vehicles and options:
Why is providing my VIN so important?
Your Vehicle Identification Number (VIN) allows us to flash the module with the exact software calibration your truck or van needs. This ensures perfect compatibility with your engine, transmission, and factory options, preventing performance issues.
Do I need any special tools for installation?
No special tools are required. A basic socket set to disconnect the battery and unbolt the module bracket is all you should need for a successful installation.
What is the security relearn procedure?
It’s a simple process to sync the new PCM with your vehicle’s anti-theft system. It typically involves cycling the ignition key on and off in 10-minute intervals. We include detailed instructions with your purchase.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like code P0601) or a fault the PCM controls, then yes, this will resolve the issue. It’s crucial to diagnose the root cause of the code first.
Where is the PCM located on my Express/Savana van?
On the full-size vans like the Express and Savana, the PCM is typically located in the engine compartment on the driver’s side, near the rear of the engine.