Is Your GM Truck or Van Plagued with Mysterious Engine Problems?
If you’re driving a 1999-2000 GMC Yukon, or one of the many other GM vehicles from that era, you know it’s a workhorse. But when the brain of the operationโthe Powertrain Control Module (PCM)โstarts to fail, it can be incredibly frustrating. You might be dealing with a Check Engine Light that won’t go away, rough idling, stalling at stoplights, or even a vehicle that refuses to start at all. These aren’t just annoyances; they’re signs that your engine’s central computer is struggling.
From the Shop Floor: A Real-World Scenario
“A customer’s 2000 Yukon Denali came in last week with these exact symptoms. It would start fine cold, but after 15 minutes of driving, it would stall and refuse to restart for an hour. We scanned it and got a slew of intermittent communication codes. After checking the wiring and grounds, we knew the culprit was the PCM. Heat soak was causing an internal failure on the main board. We installed one of our pre-programmed modules, performed the security relearn, and had him back on the road the same afternoon. It’s a repair I’ve done hundreds of times on these GMT400 and early GMT800 platform vehicles.”
The Core of the Problem: Why These PCMs Fail
The original PCMs in these trucks and vans are subjected to years of intense heat cycles and engine vibration. Over two decades, the delicate internal solder joints and electronic components can develop microscopic cracks or fail outright. This leads to the unpredictable behavior you’re experiencing, as the PCM can no longer properly manage critical functions like fuel injection, ignition timing, and transmission shifting.
Your Direct-Fit, Programmed Solution
This Powertrain Control Module is the definitive solution to get your vehicle running reliably again. It’s not just a part; it’s a complete service. We take your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and program the module with the latest, most stable software directly from GM. This ensures that when it arrives at your door, it’s ready for a straightforward installation, communicating perfectly with your specific vehicle’s systems.
- โ Eliminate Guesswork: Stop chasing random codes and symptoms. A failing PCM is a common root cause for many hard-to-diagnose issues.
- โ Restore Performance: Regain smooth idling, crisp throttle response, and proper automatic transmission shift points.
- โ No Dealer Visit Needed: Our VIN programming service means you don’t need a trip to the dealership for expensive flashing with a Tech 2 scanner.
- โ Pass Emissions Testing: A properly functioning PCM is essential for clearing your Check Engine Light and passing state inspection.
- โ Broad Compatibility: This module is a direct replacement for multiple part numbers, including 16263494 and 16265035, and fits a wide range of Chevrolet, GMC, and Isuzu models.
Expert Installation Insights
While installation is relatively simple for a DIYer with basic tools, here are a few pro tips. First, always disconnect the negative battery terminal before starting. The PCM’s location varies by modelโon many trucks like the Yukon or Tahoe, it’s in the left front of the engine bay, while on Express/Savana vans, it’s often in the left rear. Carefully disconnect the wiring harnesses and swap the module. After reconnecting the battery, you will likely need to perform a security relearn procedure (often called a Passlock or Passkey relearn). This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times. This simple procedure syncs your new PCM with the vehicle’s anti-theft system.
Confirm Your Fitment
This module is the correct replacement for units with service numbers 16263494, 16265035, or 8162634940. Please check the part number on your existing module to ensure compatibility. After purchase, simply send us your VIN, and we’ll handle the rest, ensuring you get a part that’s perfectly matched to your vehicle’s powertrain and options.