Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet, GMC, or Isuzu vehicle suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or inconsistent shifting? These are classic symptoms of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. This replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s reliability, efficiency, and drivability. It serves as the brain of your powertrain, and when it falters, the entire vehicle’s performance suffers.
Unlike generic modules that require expensive trips to the dealership for programming, this unit is delivered to you ready for installation. We take the hassle out of the repair process by pre-programming the module with the latest official GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect compatibility and function right out of the box, addressing software-related bugs and improving overall operation beyond what your original module could offer.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe come into the shop with an intermittent no-start condition that was driving the owner crazy. It would run fine for days, then refuse to start for no apparent reason. We checked the fuel pump, ignition system, and battery—all were fine. After hours of diagnostics, we traced the issue to an internal fault in the PCM that would only manifest when the module reached a certain temperature. We replaced it with a VIN-programmed unit just like this one. The customer called a month later to say the truck hadn’t missed a beat since. It’s often the computer that causes the most elusive problems.
Diagnosing a Faulty 1999 Chevrolet 1500 PCM
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing a combination of the issues below, your PCM is the most likely culprit. Replacing it is a crucial step in getting your dependable truck back on the road. This module is a direct replacement for service numbers 16263494, 16265035, and 8162634940, ensuring a perfect match for a wide range of vehicles.
Common Symptoms of PCM Failure
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Rough or erratic engine idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Failure to pass state emissions tests.
Simple, Secure Installation Process
Our goal is to make your repair as straightforward as possible. After you place your order, simply provide us with your vehicle’s VIN. Our technicians will flash the module with the correct software for your truck’s specific configuration. Once you receive the part, installation is typically a simple plug-and-play process. In many cases, you may need to perform a simple security relearn procedure (often called VATS or Passlock relearn) which involves a sequence of key turns and does not require any special tools. This syncs the new PCM with your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Just provide your vehicle’s VIN during or after checkout, and the module will arrive with the latest GM software, ready for installation.
Where is the PCM located on my 1999 Chevy 1500 Pickup?
On most 1999 GM trucks like the Chevrolet 1500, Silverado, and Sierra, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
What is a security relearn procedure?
This is a simple procedure required on many GM vehicles to sync the new PCM with the existing anti-theft system. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. Instructions are readily available online for your specific model.
Will this part fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this will resolve the issue. However, it’s always recommended to have the codes read by a scanner to ensure the problem isn’t with a different sensor or component.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several part numbers, including 16263494, 16265035, 218-11787, and 21811787. Please check the fitment list to confirm it matches your vehicle.