Restore Peak Performance to Your GM Truck or Van
Is your 1999 Chevrolet Suburban 1500, or another compatible GM vehicle, suffering from erratic engine behavior, poor fuel economy, or transmission shifting problems? These are common indicators of a failing Powertrain Control Module (PCM). As the central computer for your vehicle’s engine and transmission, a faulty PCM can cause a cascade of frustrating issues, often leading to a check engine light and failed emissions tests. This replacement PCM, part number 16263494, is the definitive solution to restore your vehicle’s factory performance, drivability, and reliability.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or salvage yard, this unit is professionally programmed with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) during checkout. This ensures that when the part arrives, it’s ready for installation, communicating perfectly with all other systems in your truck or van, just as the original did.
From the Diagnostic Bay
We had a 1999 GMC Sierra come into the shop with a persistent P0300 random misfire code. The owner had already replaced the spark plugs, wires, distributor cap, and rotor. The misfire was still there, especially under load. After checking fuel pressure and for vacuum leaks, we hooked up our professional scan tool and monitored the live data. We noticed the injector pulse width was erratic and ignition timing was jumping around. This pointed away from the mechanical parts and straight to the computer. We installed a correctly programmed PCM, performed the security relearn, and the truck ran perfectly smooth. It’s a classic case where chasing parts gets expensive; sometimes the problem lies with the brain, not the body.
Is Your Vehicle Showing Signs of PCM Failure?
- ✔ Check Engine Light is on with various trouble codes (DTCs)
- ✔ Rough or inconsistent engine idling
- ✔ Vehicle fails to start or stalls intermittently
- ✔ Harsh or delayed transmission shifting
- ✔ Noticeable decrease in fuel efficiency
- ✔ Engine misfires or stumbles during acceleration
- ✔ Failure to pass state emissions testing
The Importance of a Programmed 1999 Suburban 1500 PCM
For vehicles of this era, the PCM is not a simple ‘plug-and-play’ component. It contains specific data about the engine size, transmission type, gear ratios, and emissions equipment for your exact vehicle configuration. Using an unprogrammed or incorrectly programmed module can result in poor performance or even prevent the vehicle from starting due to the anti-theft system (VATS/Passlock). By providing your VIN, you guarantee that this module is a 100% correct, direct-fit solution. It’s the closest you can get to a new part from the dealer without the high cost and inconvenience of having them perform the programming.
Installation is straightforward for a DIY mechanic. Once the module is physically installed, you will likely need to perform a simple security relearn procedure, which does not require any special tools. This procedure syncs the new PCM with your vehicle’s anti-theft system. Instructions for this are widely available and typically involve a sequence of key turns.
This module is a direct replacement for part numbers: 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your part number and consult the extensive fitment list to ensure compatibility with your specific make, model, and year.
Frequently Asked Questions
Do I need to have this module programmed?
No. This PCM comes pre-programmed to your vehicle’s specific VIN. Simply provide us with your 17-digit VIN when you place your order, and we will load the latest GM software for your exact configuration before shipping.
Is this part difficult to install?
The physical installation is typically simple, involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. The most important step after installation is performing the security relearn procedure, which allows the new PCM to communicate with your vehicle’s anti-theft system. This procedure does not require special tools.
What is the security relearn procedure?
The security relearn (also known as a VATS or Passlock relearn) is a sequence of key cycles that syncs the new computer to your vehicle’s ignition key. A common method is the ’10-minute relearn’ which involves turning the key to the ‘ON’ position for 10 minutes, then off, and repeating the cycle two more times. Specific instructions can be easily found online for your model.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield. It is also located on the sticker in the driver’s side door jamb.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty PCM, then this part is the correct solution. It’s crucial to properly diagnose the issue before ordering. If your codes point to specific sensor failures, you should investigate those components first.