Is Your Truck Running Rough, Stalling, or Refusing to Start?
When your Chevrolet, GMC, or Isuzu truck or van starts acting up, the root cause is often the one component you can’t easily see: the Powertrain Control Module (PCM). A failing PCM can cause a cascade of frustrating issues, from a persistent Check Engine Light to a vehicle that leaves you stranded. This isn’t just an inconvenience; for a work truck, it’s lost time and money. You need a reliable solution that gets you back on the road without guesswork. This is the correct, professionally programmed PCM, ready for installation.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing PCM is the likely culprit. This module is the definitive solution for:
- Intermittent or complete no-start conditions
- Poor fuel economy and reduced engine power
- Erratic automatic transmission shifting
- Check Engine Light (CEL) with communication codes (like U-codes) or internal processor fault codes (e.g., P0601, P0606)
- Stalling for no apparent reason
- Failure to pass emissions testing
Don’t waste time and money on incorrect diagnoses. This professionally prepared 1999-2000 Chevrolet 3500 PCM is the heart of your vehicle’s management system, and we ensure it’s ready to perform flawlessly from the moment you install it.
Features & Real-World Benefits
- ✔ VIN-Specific Programming: We flash this module with the latest GM software updates using your vehicle’s unique VIN. This ensures perfect compatibility with your engine, transmission, and options, eliminating the need for expensive dealership programming.
- ✔ Plug-and-Play Installation: Because it arrives pre-programmed, installation is straightforward. Simply disconnect the battery, swap the modules, and reconnect. In most cases, a security relearn procedure is all that’s needed to get you running again.
- ✔ Restored Performance & Efficiency: With updated software and a perfectly functioning processor, you’ll restore the original power, smooth shifting, and fuel efficiency your truck was built to deliver.
- ✔ Quality Inspected Hardware: Every module undergoes a thorough inspection to ensure the hardware is sound and ready for years of dependable service. This is a lasting fix, not a temporary patch.
- ✔ Broad GM Compatibility: This module is a direct replacement for multiple part numbers, including 16263494 and 16265035, fitting a wide range of popular GM trucks and vans from the era.
Expert Insight: The “Bad Fuel Pump” That Wasn’t
A customer with a 2000 Express 2500 work van was about to spend over $700 replacing a fuel pump. The van would start fine cold, but after a few hours of running deliveries, it would stall and refuse to start for an hour. His mechanic suspected the pump was overheating. From my experience, I recognized these as classic symptoms of a heat-soaked, failing PCM. The internal processor was breaking down when it got hot. We sent him this exact programmed module. He installed it in 15 minutes in his driveway, and the van has run perfectly ever since. He saved hundreds of dollars and, more importantly, got his delivery van back in service the next day. Sometimes, the brain is the problem, not the muscle.
This isn’t just a replacement part; it’s the restoration of your vehicle’s core operational integrity. By providing us with your VIN upon purchase, you are ensuring that the 1999-2000 Chevrolet 3500 PCM you receive is perfectly matched to your vehicle’s specific configuration. This critical step is the key to a successful and lasting repair, getting your hard-working truck or van back to peak condition.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, we will need your 17-digit Vehicle Identification Number (VIN). This allows us to program the module with the exact software and calibrations for your specific truck or van.
Will I need to do anything after I install it?
In most GM vehicles of this era, you will need to perform a security relearn procedure (often called a CASE learn or Passlock relearn). This procedure is simple, requires no special tools, and typically involves a sequence of turning the key on and off. Instructions are readily available online, or your mechanic will be familiar with the process.
Is this a guaranteed fix for my problem?
While this module corrects all common PCM-related failures, it’s essential to ensure your vehicle has been properly diagnosed. This part will solve issues stemming from an internal computer fault but will not fix problems related to bad sensors or wiring. If you have codes like P0601, it’s a very strong indicator the PCM is the issue.
How do I know if this fits my vehicle?
Please review the detailed compatibility list provided. This module replaces several part numbers, including 16263494, 16265035, and 8162634940. As long as your vehicle is on the list and requires one of these part numbers, this is the correct component for you. The VIN programming ensures it matches your specific options.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM is an ECM that also controls the transmission and other powertrain functions. For your 1999-2000 Chevrolet 3500 PCM, it manages both the engine and automatic transmission, making it a true PCM.