Restore Peak Performance to Your GM Vehicle
Is your truck, van, or SUV suffering from frustrating issues like intermittent stalling, erratic shifting, a persistent check engine light, or a no-start condition? As a mechanic with over two decades of experience under the hood, I’ve seen these symptoms hundreds of times. More often than not, the root cause is a failing Powertrain Control Module (PCM)—the electronic brain of your vehicle. This 16263494 Powertrain Control Module is the direct, reliable solution you need to get your vehicle running smoothly again.
Unlike sourcing a part from a junkyard or facing steep dealership prices, this module offers a streamlined, cost-effective fix. We take the hassle out of the replacement process. Before we ship it, we program the module with the latest official GM software updates, specifically matched to your vehicle’s VIN. This means it arrives at your door ready for installation, saving you a trip to the dealer and hundreds in programming fees. It’s the smart, efficient way to restore your engine’s performance and your peace of mind.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1999 Chevy Tahoe that came into my shop with a problem that drove the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10 minutes. There were no consistent trouble codes, just a history of random misfires. We checked fuel pressure, spark, and sensors—all tested fine. After spending hours chasing this electrical ghost, we decided to swap the PCM. The original module had a hairline fracture on the circuit board that would separate when it got hot, cutting communication. Installing a properly programmed replacement like this 16263494 Powertrain Control Module solved the problem instantly. It’s a classic failure mode for these units, and a fresh, correctly programmed module is the only guaranteed fix.
Common Signs of a Failing PCM
If your vehicle is exhibiting any of these symptoms, a faulty engine computer is a likely culprit. Replacing it can be the definitive solution.
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially after the engine warms up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
A Straightforward Guide to Installation
Getting your vehicle back in top shape is easier than you think. For most of the compatible vehicles, this is a simple plug-and-play process. Just follow these steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these trucks and vans, the PCM is found in the engine compartment. Look on the driver’s side (LH) near the firewall, under the battery tray, or on the passenger’s side (RH) fender wall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that may need to be gently pried up. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Securely reconnect all electrical harnesses. Ensure they click into place to confirm a solid connection.
- Reconnect Power: Re-attach the negative battery terminal.
- Perform Security Relearn (If Needed): For many GM vehicles of this era, you may need to perform a simple key-cycle 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 new PCM to recognize your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your part number or match your vehicle from the list below to ensure proper fitment. This unit fits a wide range of gasoline-powered GM models, including:
- Cadillac Escalade: 1999-2000
- Chevrolet Trucks: C/K 1500/2500/3500 Pickup (99-00), S10 (98-00), Silverado 1500 (99-00), Suburban 1500/2500 (99), Tahoe (99-00 Classic)
- Chevrolet Vans: Astro (99-01), Express 1500/2500/3500 (99-02)
- GMC Trucks: C/K 1500/2500/3500 Pickup (99-00), Jimmy S15 (98-00), Sierra 1500 (99-00), Sonoma S15 (98-00), Yukon & Yukon Denali (99-00)
- GMC Vans: Safari (99-01), Savana 1500/2500/3500 (99-02)
- Oldsmobile / Isuzu / GMC SUVs: Bravada (98-00), Envoy (98-00), Isuzu Hombre (98-00)
Note: Some 1998 models require build date option ZN4. Please confirm compatibility before ordering. This 16263494 Powertrain Control Module is your reliable path to a lasting repair.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on where to send us your vehicle’s 17-digit VIN. We cannot ship the module until we have this information to program it correctly for your vehicle.
Is any additional programming required after installation?
No. This module arrives fully programmed with the latest GM software for your specific VIN. In some cases, a simple ‘Security Relearn Procedure’ may be necessary, which you can do yourself in about 30 minutes with just your ignition key.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.
Where is the part number located on my original module?
The part number is typically printed on a sticker on the case of your existing PCM. You may see a Service Number (SERV. NO.) which is what you should match to our list.
What is your warranty policy?
This part comes with our standard warranty, guaranteeing it to be free from defects in materials and workmanship. Please see our full warranty page for complete details and peace of mind.