Is your Chevrolet, GMC, or Isuzu truck or van suffering from perplexing engine problems, a persistent check engine light, or a no-start condition? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. It arrives at your door fully programmed with the latest official GM software, specifically matched to your vehicle using your VIN.
From the Diagnostic Bay
We once had a 2000 GMC Sierra 2500 in the shop that was driving the owner crazy. It had an intermittent stalling issue and a random misfire code that would come and go. He had already replaced the spark plugs, wires, coil packs, and even the crankshaft position sensor, but the problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed the injector pulse width signals were erratic just before a stall. This pointed directly to failing driver circuits inside the original PCM. We installed one of our pre-programmed modules, performed a quick security relearn, and the truck ran perfectly. It’s a classic case where chasing sensors costs more time and money than addressing the root cause: a failing engine computer.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or rough idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Misfire codes that don’t resolve after replacing ignition components.
Why Choose Our Programmed 1999-2000 Chevrolet 3500 PCM?
When you order this module, you’re not just getting a part; you’re getting a comprehensive, plug-and-play solution. We handle the complex programming for you. Using the Vehicle Identification Number (VIN) you provide, we flash the module with the most current GM-certified calibration for your specific vehicle. This ensures all engine, transmission, and emissions parameters are set to factory specifications, correcting issues caused by outdated or corrupted software. This is a crucial step that dealerships charge a premium for, but we include it with your purchase.
This PCM is a direct replacement for a wide range of GM vehicles from the late 90s and early 2000s, including the Chevrolet Silverado, Express Van, Tahoe, S10, and their GMC counterparts like the Sierra, Savana, and Yukon. It is fully compatible with original equipment part numbers including 16263494, 16265035, 8162634940, 218-11787, and 21811787. Verify your original part number or consult the detailed fitment list to ensure perfect compatibility.
Installation is straightforward for any experienced DIYer or professional mechanic. After installation, some vehicles may require a simple security relearn procedure or a Crankshaft Variation (CASE) relearn, which can be performed with a capable bi-directional scan tool. This ensures the new PCM communicates properly with your vehicle’s anti-theft system and crankshaft position sensor for smooth operation.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. After you place your order, you must provide us with your VIN so we can flash the unit with the correct GM software before shipping.
Where is the PCM located on my truck?
On most compatible GM trucks and vans from this era, the PCM is located in the engine compartment. Common locations are on the driver’s side (LH) inner fender, near the battery, or on the passenger’s side (RH) firewall for S10/Sonoma models.
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 electronic portion of your transmission is sound, a faulty PCM can cause erratic shifting, which this replacement module will correct.
Is any additional setup required after installation?
While the module is programmed for your engine, you may need to perform a security relearn procedure (also known as a Passlock relearn) for the vehicle to start. Some vehicles may also benefit from a Crankshaft Variation (CASE) relearn to prevent a P1336 trouble code. These procedures can be done with a capable scan tool.
How do I provide my VIN?
After completing your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without this information.