Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC 2500, Silverado, or Express van suddenly running rough, refusing to start, or throwing a stubborn Check Engine Light? As a technician with over 20 years of experience under the hood, I’ve seen these symptoms countless times. More often than not, the culprit is a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. When it falters, it can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it affects your truck’s reliability, fuel economy, and safety.
We offer a dependable and straightforward solution: a replacement PCM, professionally programmed with the latest official GM software releases. We take the guesswork out of the repair by flashing the module specifically to your vehicle’s VIN before it ever leaves our facility. This ensures it communicates perfectly with your engine, transmission, and all other onboard systems, just as the original did. Getting a reliable 1999-2000 GMC 2500 PCM is the critical first step to putting those electrical gremlins behind you.
From the Diagnostic Bay
I remember a 2000 Chevy 2500 that came into my shop a few years back. The owner was at his wit’s end. He’d replaced plugs, wires, and even the fuel pump, but the truck still had a nasty intermittent stumble and would occasionally stall at stoplights. No consistent codes, just pure frustration. After hooking up my scope, I saw the injector driver signal inside the PCM was dropping out erratically. It was a classic case of internal module failure that a standard code reader would never catch. We installed a VIN-programmed PCM, and the truck ran like it just rolled off the assembly line. This is why a quality, correctly programmed module is non-negotiable.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- âś” Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” The engine cranks but refuses to start.
- âś” Harsh or erratic automatic transmission shifting.
- âś” A noticeable drop in fuel economy for no apparent reason.
- âś” Intermittent stalling, stumbling, or hesitation while driving.
- âś” Failure to pass a state emissions test.
- âś” Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks and vans is a job most DIYers can handle with basic tools. Because we program it for you, you can skip the expensive trip to the dealership for flashing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most pickups and SUVs, it’s in the engine compartment, typically on the driver’s side fender or near the battery. On vans, it’s often in the rear of the engine compartment on the driver’s side.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. Inspect them for any corrosion or damage.
- Swap the Modules: Unbolt and remove the old PCM. Mount your new, pre-programmed module in its place.
- Reconnect Everything: Securely plug the electrical harnesses into the new PCM until they click. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure (often called Passlock or CASE) to recognize the new module. This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following vehicles. Please match your part number or contact us with your VIN to confirm.
CHEVROLET 2500 PICKUP 99-00 (Gasoline, ID 16263494 for ’99)
CHEVROLET 3500 PICKUP 99-00 (Gasoline, ID 16263494 for ’99)
SILVERADO 1500 PICKUP 99-00 (4.3L V6)
TAHOE 99-00 (Classic Style, ID 16263494 for ’99)
SUBURBAN 1500/2500 99 (Gasoline, ID 16263494)
GMC 1500 PICKUP 99 (5.0L/5.7L, ID 16263494)
GMC 2500 PICKUP 99-00 (Gasoline, ID 16263494 for ’99)
GMC 3500 PICKUP 99-00 (Gasoline, ID 16263494 for ’99)
SIERRA 1500 PICKUP 99-00 (4.3L V6)
YUKON 99-00 (Denali for ’00, ID 16263494 for ’99)
ESCALADE 99-00 (ID 16263494 for ’99)
EXPRESS/SAVANA VAN 1500/2500/3500 99-02 (Gasoline, check ID 16263494)
ASTRO/SAFARI VAN 99-01 (ID 16263494)
BLAZER/JIMMY S10/S15 98-00 (w/ opt ZN4 for ’98)
S10/S15/SONOMA 98-00 (4.3L, w/ opt ZN4 for ’98)
BRAVADA 98-00 (w/ opt ZN4 for ’98)
ENVOY 98-00 (w/ opt ZN4 for ’98)
ISUZU HOMBRE 98-00 (4.3L, w/ opt ZN4 for ’98)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This includes engine size, transmission type, and emissions equipment, ensuring a perfect, plug-and-play installation.
Is this a simple plug-and-play part?
Yes! Because we program it to your VIN before shipping, it is ready for installation. In most cases, the only additional step is a simple security relearn procedure that you can do yourself in about 30 minutes with just your car key.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions like shift points and line pressure. If the transmission issues are caused by faulty electronic signals from the module, this part will resolve them. It will not fix internal mechanical failures in the transmission.
What if I order the wrong part?
We strongly encourage you to match one of the compatible part numbers (16263494, 16265035, 8162634940) or send us your VIN to verify fitment before ordering. This helps guarantee you get the right part the first time.
Do I need to send my old PCM back?
No core charge is required for this part. You can keep your old module or recycle it locally.