Is Your Truck Running Rough, Stalling, or Refusing to Start?
If your 1999-2000 GMC 2500 is giving you headaches with unpredictable behavior, you’re not alone. Over my 20+ years in the shop, I’ve seen countless GM trucks and vans from this era come in with symptoms that leave owners scratching their heads: a check engine light that won’t go away, stalling at stoplights, hard starting, or erratic transmission shifting. More often than not, the culprit is a failing Powertrain Control Module (PCM), the electronic brain of your vehicle.
A Technician’s Real-World Experience
A customer’s 2000 Chevrolet Silverado 2500 came in last week with these exact symptoms. It would die intermittently and threw a confusing mix of sensor codes. After verifying the wiring and sensors were good, we hooked up our high-level scan tool. The PCM was slow to communicate and eventually gave us the dreaded P0601 code: Internal Control Module Memory Check Sum Error. This is a definitive sign of internal PCM failure. The internal capacitors and processors, after two decades of heat cycles and vibration, had simply worn out. Replacing the module was the only correct fix.
The Direct Solution: A VIN-Programmed PCM
Don’t let a faulty computer sideline your workhorse. This Powertrain Control Module is the reliable, straightforward solution to restore your vehicle’s performance and dependability. The biggest challenge with replacing a PCM isn’t the physical installationโit’s the programming. Without the correct software, the truck won’t even start. We solve that problem for you. Before we ship this module, our technicians will program it with the latest official GM software updates, specifically matched to your vehicle using its unique Vehicle Identification Number (VIN). This ensures perfect communication between the engine, transmission, and all related systems.
Common Symptoms of a Failing GM PCM:
If you’re experiencing any of the following, a failing PCM is a likely cause. I’ve personally diagnosed these issues hundreds of times on vehicles just like yours.
- โ Check Engine Light is on with various, often inconsistent, trouble codes.
- โ The engine cranks but refuses to start.
- โ Unexplained stalling, especially when the engine is warm or at idle.
- โ Noticeably poor fuel economy.
- โ Harsh or erratic automatic transmission shifting.
- โ Communication errors when trying to use a diagnostic scan tool.
- โ No-start condition combined with a non-functional security light.
Plug-and-Play Simplicity
Because we handle the complex programming, the installation process is simplified. Once you receive the module, it’s typically a matter of disconnecting the battery, unplugging the old PCM, installing the new one, and reconnecting the battery. In most cases, this eliminates the need for an expensive trip to the dealership for programming, saving you both time and money. After installation, you may need to perform a security relearn procedure, which is a simple process that can be done without special tools.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and vans. To ensure a perfect match, please verify your original part number. This unit is compatible with the following service and part numbers:
- โ 16263494
- โ 16265035
- โ 8162634940
- โ 218-11787
- โ 21811787
IMPORTANT: After purchasing, please provide us with your vehicle’s VIN. We cannot ship your order until we have this information to perform the essential programming service.