Restore Your Vehicle’s Core Performance
Is your GM truck or van suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. A faulty PCM can create a cascade of problems that are often misdiagnosed, leading to wasted time and money on unnecessary parts. This replacement PCM is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
I once had a 2000 Chevy Express van in the shop with an intermittent stalling problem that was driving the owner crazy. He had already replaced the throttle position sensor and the crankshaft position sensor based on some generic trouble codes, but the van would still die randomly at stoplights. After hooking up our professional scanner and monitoring live data, we noticed the 5-volt reference signal to the sensors would flicker and drop out just before a stall. The sensors were fine; the problem was the PCM itself. The internal voltage regulator was failing. We installed a VIN-programmed module just like this one, and the van ran perfectly. It’s a textbook example of how a failing computer can mimic sensor failures, making a correct diagnosis crucial.
Diagnosing a Faulty 1999-2000 GMC 2500 PCM
The PCM is the brain of your vehicle’s powertrain. When it begins to fail, the symptoms can be varied and confusing. If you’re experiencing any of the following, a failing computer could be the culprit.
Common Symptoms of PCM Failure
- ✔ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel efficiency for no apparent reason.
- ✔ The vehicle cranks but will not start (no-start condition).
- ✔ Failure to pass state emissions testing due to readiness monitor issues.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution
Don’t let a faulty computer keep your reliable GM truck or van off the road. This Powertrain Control Module is a direct-fit replacement, designed to meet or exceed original equipment specifications. The most critical feature of this part is our complimentary programming service. Upon purchase, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most up-to-date software directly from GM for your specific vehicle. This ensures that all engine, transmission, and emissions parameters are perfectly calibrated, just as they were from the factory. This process eliminates the need for an expensive trip to the dealership for programming, saving you hundreds of dollars and significant downtime.
This module is a direct replacement for multiple original part numbers, including: 16263494, 16265035, 8162634940, and 218-11787. Verify the part number on your existing module to ensure compatibility.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This module comes pre-programmed to your vehicle’s specific VIN before we ship it. All you need to do is provide your VIN to us after your purchase. This makes the installation process straightforward, without the need for specialized tools or a visit to a dealership.
What is a Powertrain Control Module (PCM)?
The PCM is your vehicle’s main computer, responsible for managing the engine’s fuel injection, ignition timing, emissions systems, and the transmission’s shift points. It ensures optimal performance, fuel economy, and low emissions.
Where is the PCM located on my vehicle?
On these late 90s and early 2000s GM trucks and vans, the PCM (or ECM) is typically located in the engine bay. Common locations include the driver’s side (LH) inner fender, near or under the battery tray, or on the passenger’s side (RH) firewall. Always disconnect the battery before attempting to remove or install the module.
How do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the vehicle itself. The most common locations are on a metal plate on the driver’s side of the dashboard (visible through the windshield) and on a sticker inside the driver’s side door jamb.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or an internal module error, this replacement part will solve the issue. However, if the light is on due to a separate failed sensor or component (like an oxygen sensor or EGR valve), that part will still need to be addressed. This module will restore the PCM’s ability to correctly read and interpret sensor data.