Restore Your GM Truck’s Brain and Get Back on the Road
Is your Chevrolet, GMC, or Isuzu truck or van acting up? Experiencing frustrating issues like a persistent Check Engine Light, rough idling, stalling, or unpredictable transmission shifting? Before you spend a fortune at the dealership, the problem could be a failing Powertrain Control Module (PCM), the central computer of your vehicle. This replacement PCM, part number 16265035, is the reliable, cost-effective solution you need. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest GM software updates, ready for a straightforward installation.
From the Diagnostic Bay: The Case of the Intermittent S-10
I remember a 2000 Chevy S-10 with the 4.3L V6 that came into my shop. The owner was at his wit’s end. The truck would run fine for days, then suddenly refuse to start. No rhyme or reason. He’d already replaced the battery, plugs, and wires. We scanned it and found a P0601 (Internal Control Module Memory Check Sum Error) code stored, but it wasn’t always active. After checking all power and ground connections to the PCM, we knew the module itself was failing internally. Heat cycles and vibration had finally taken their toll. Instead of a costly dealer part and programming fee, we installed one of these VIN-programmed modules. The fix was immediate and permanent. That’s the power of having a reliable, pre-programmed part ready to go.
Is Your Vehicle Showing These Symptoms?
A failing PCM can cause a wide range of confusing problems. If you’re noticing any of the following, it might be time for a replacement:
- ✔ Persistent Check Engine Light with codes like P0601, P0604, or P0606.
- ✔ Vehicle refuses to start or has intermittent starting problems.
- ✔ Poor engine performance, including misfires, hesitation, or stalling.
- ✔ A significant drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in their own driveway. Here’s a basic overview of the process:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most trucks and SUVs (Silverado, Sierra, Tahoe, S10), it’s in the engine compartment, often on the driver’s side fender or near the battery. On Express/Savana vans, it’s typically in the LH rear of the engine compartment.
- Disconnect the Old Module: Carefully unplug the electrical connectors. These GM connectors often have a lever or locking tab that needs to be released. Avoid forcing them.
- Swap the Modules: Unbolt the old PCM from its bracket and secure the new one in its place.
- Connect and Secure: Plug the wiring harnesses firmly into your new, programmed PCM. Ensure they click into place. Reconnect your battery terminal.
- Perform Security Relearn (If Needed): In many cases, you will need to perform a simple security relearn procedure. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system.
With this pre-programmed 1999 Chevrolet 1500 PCM, you’re not just buying a part; you’re buying a complete solution that restores your vehicle’s performance and reliability.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is confirmed to fit the following vehicles. Please provide your VIN upon purchase to ensure perfect programming.
CHEVROLET SILVERADO & GMC SIERRA 1500 1999-2000 (4.3L V6)
CHEVROLET & GMC VANS (EXPRESS/SAVANA 1500/2500/3500) 1999-2002
CHEVROLET S10 / GMC SONOMA 1998-2000 (4.3L V6)
CHEVROLET BLAZER / GMC JIMMY 1998-2000
OLDSMOBILE BRAVADA 1998-2000
GMC ENVOY 1998-2000
CHEVROLET ASTRO / GMC SAFARI 1999-2001
CHEVROLET TAHOE / GMC YUKON 1999-2000
CADILLAC ESCALADE 1999-2000
ISUZU HOMBRE 1998-2000 (4.3L V6)
CHEVROLET & GMC SUBURBAN (1500/2500) 1999
Note: Fitment may depend on specific options (e.g., engine size, build date). Matching the part number or providing your VIN is the best way to guarantee compatibility.
Frequently Asked Questions
Do I need to do anything after I install it?
In most cases, you will need to perform a simple security relearn procedure, which takes about 30 minutes and requires no special tools. This allows the new PCM to communicate with your vehicle’s anti-theft system. Instructions are readily available online for your specific model.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Is this a plug-and-play part?
Yes, because we program it to your VIN before shipping, it is a plug-and-play installation aside from the potential security relearn procedure. No trip to the dealer for expensive programming is required.
What if my part number is slightly different?
This module is compatible with several part numbers, including 16263494, 8162634940, and others listed. As long as your original module matches one of the numbers in our list, this part will work for you once programmed.
What causes a PCM to fail?
PCM failure is often caused by years of exposure to heat, vibration, and electrical stress. Internal circuit boards can crack, or components can fail, leading to the erratic symptoms you’re experiencing.