Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC 2500, Chevy Silverado, or Express van suddenly giving you headaches? If you’re dealing with a persistent check engine light, rough idling, stalling, or a complete no-start condition, the problem often points to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel mixture and ignition timing to transmission shift points. When it fails, your vehicle’s reliability and performance suffer dramatically.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and high dealership costs out of the equation. Each module is professionally programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. This ensures all factory-corrected drivability issues are addressed, giving you performance that’s often better than when the truck was new.
A Technician’s Notebook
I remember a 2000 Chevy 2500 that came into my bay with an intermittent stalling problem that had stumped two other shops. The owner was frustrated, having already replaced the fuel pump and ignition coil. The truck would run fine for days, then die at a stoplight without warning. No codes were stored. On a hunch, I monitored the PCM’s 5-volt reference signal on my scope. After letting it idle for 30 minutes, I saw the voltage signal become erratic just before it stalled. The internal voltage regulator in the original PCM was failing under heat soak. We installed one of these VIN-programmed modules, and the truck has run flawlessly for the owner ever since. It’s a classic failure mode for these units.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re noticing any of the following, it might be time for a replacement:
- âś” Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- âś” The engine cranks but refuses to start.
- âś” Unexplained drop in fuel economy.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Intermittent stalling or rough running, especially after warming up.
- âś” Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
Replacing the 1999-2000 GMC 2500 PCM is a job most DIYers can handle in their own driveway. Our pre-programmed module makes it a simple swap.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most trucks like the GMC 2500, you’ll find the PCM in the engine compartment, typically on the driver’s side near the battery or firewall. In vans like the Express/Savana, it’s often in the rear of the engine compartment.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new PCM.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is confirmed to fit a wide range of GM trucks, SUVs, and vans. Please verify your vehicle from the list below:
Fits Models Including:
- 1999-2000 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- 1999-2002 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
- 1999-2000 Cadillac Escalade
- 1999-2000 Chevrolet Tahoe & GMC Yukon (including Denali)
- 1999 Chevrolet Suburban 1500/2500
- 1998-2000 Chevrolet S10, GMC Sonoma, Isuzu Hombre (4.3L)
- 1998-2000 Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada, GMC Envoy (4.3L)
- 1999-2001 Chevrolet Astro & GMC Safari (4.3L)
Note: Some 1998 models require build date option ZN4. Some models require matching ID 16263494. Providing your VIN ensures perfect compatibility.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to program the PCM with the exact software calibration and updates specific to your truck’s engine, transmission, and options. This ensures seamless communication and optimal performance, just like a part from the dealer.
Is this a simple plug-and-play installation?
Yes, for the most part. The module is a direct physical replacement. After installation, you will need to perform a ‘Security Relearn Procedure’ which syncs the new module to your vehicle’s anti-theft system. It’s a simple process that does not require special tools and instructions are readily available online or in your service manual.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0608), then yes, this module will resolve the issue. However, it’s always best to have the codes professionally diagnosed to ensure the PCM is the root cause and not a faulty sensor or wire.
What’s the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls the engine. PCM (Powertrain Control Module) controls both the engine and the automatic transmission. ECU (Electronic Control Unit) is a more generic term. For these GM vehicles, PCM is the most accurate term.
Does this module come with the latest software?
Absolutely. We flash every module with the most current software available from GM. This can correct drivability issues, improve efficiency, and fix bugs that were present in the original factory programming.