Restore Peak Performance to Your GM Vehicle
Is your Chevrolet, GMC, or Isuzu truck or van suffering from frustrating issues like a persistent check engine light, rough idling, poor fuel economy, or erratic shifting? These are classic symptoms of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. This replacement PCM, part number 21811787, is the definitive solution to restore your vehicle’s reliability and drivability. It arrives at your door fully programmed with the latest GM software, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This eliminates the need for an expensive trip to the dealership for programming, making for a straightforward, plug-and-play repair.
From the Diagnostic Bay
We had a 2001 GMC Savana 2500 work van come into the shop that was driving its owner crazy. It would randomly stall at traffic lights and had a harsh 1-2 shift. The owner had already replaced the throttle position sensor and the mass air flow sensor with no improvement. After hooking up our diagnostic scanner, we noticed erratic data from several sensors, but the sensors themselves tested fine. This pointed us directly to the PCM. The internal processor was failing, corrupting the signals it was sending and receiving. After installing one of our pre-programmed modules and performing the quick security relearn, the van ran like new. The stalling vanished, the shifts were smooth, and the owner was back on the job without wasting any more money on unnecessary parts.
Is Your PCM Failing? Common Symptoms
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Stored diagnostic trouble codes (DTCs) related to internal module failure (e.g., P0601, P0605, P0606)
- ✔ Unexplained engine stalling or difficulty starting
- ✔ Rough or inconsistent engine idle
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh, delayed, or incorrect automatic transmission shifting
- ✔ Failure to communicate with diagnostic scan tools
- ✔ Vehicle fails to pass state emissions inspection
The Importance of a VIN-Programmed Module
Modern vehicles are complex networks of electronic modules that must communicate seamlessly. A generic, unprogrammed module simply will not work. Our process ensures perfect integration. When you provide your VIN, we flash this **GM 16263494 PCM** with the exact software configuration your vehicle left the factory with, plus any subsequent updates from General Motors. This guarantees that all systems—from the anti-lock brakes (ABS) to the body control module (BCM) and the anti-theft system (VATS/Passlock)—function exactly as intended. This is not just a replacement part; it’s a restoration of your vehicle’s core electronic nervous system.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. Please verify the part number on your original module or consult our extensive fitment list to ensure compatibility with your specific year, make, and model.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
How do I provide my vehicle’s VIN?
After you complete your purchase, we will send you an email requesting your VIN. You can also add your VIN to the notes section during checkout. We cannot ship your part until we have this information to program it correctly.
Is any additional procedure needed after installation?
In most cases, you will need to perform a simple security relearn procedure, also known as a VATS or Passlock relearn. This process syncs the new PCM with your vehicle’s anti-theft system and can be done without any special tools. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this cycle three times before starting the engine.
Will this fix my vehicle’s problem for sure?
This module will correct any issues directly caused by a faulty PCM. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems caused by other faulty components, such as bad sensors, wiring issues, or mechanical failures.
Where is the PCM located on my vehicle?
The location varies by model. On many GM trucks like the Silverado and Sierra, it’s on the driver’s side of the engine compartment, often under the battery tray. On vans like the Express and Savana, it’s typically found in the rear driver’s side of the engine compartment. For S10/Blazer models, it’s often on the passenger side firewall. Always disconnect the battery before removal and installation.