Restore Your GM Truck’s Performance and Reliability
If you’re dealing with a frustrating no-start condition, a persistent Check Engine light, or erratic engine behavior in your 1998-2000 Chevy Blazer, GMC Jimmy, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your engine, when the PCM goes bad, it can create a cascade of problems that are difficult to diagnose. This isn’t just a replacement part; it’s a direct solution, pre-programmed with the latest GM software updates specifically for your vehicle’s VIN. This ensures optimal performance, fuel economy, and transmission function right out of the box.
Forget about expensive dealership visits for programming or the gamble of using a junkyard module. We handle the critical programming for you before we ship. All you need to do is provide your vehicle’s VIN after purchase, and we’ll send you a PCM that’s ready for a straightforward installation. This is the most efficient way to get your truck or SUV running right again.
A Technician’s Notebook: The Phantom No-Start
I had a ’99 GMC Jimmy S15 in the bay that was a real head-scratcher. The owner said it would randomly refuse to start, but only after it was warm. No codes, good fuel pressure, good spark when it decided to run. We checked grounds, sensors, and the ignition system—everything looked fine. On a hunch, I monitored the PCM data stream during a crank/no-start event and saw the injector pulse width command was dropping out completely. The PCM was failing internally under heat soak. We installed a VIN-programmed module just like this one, and the problem was solved instantly. These older PCMs are notorious for failing in ways that don’t always set a clear trouble code, making a quality, pre-programmed 1998-2000 Blazer S10 PCM the most reliable fix.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it might be time for a replacement:
- ✔ Check Engine Light is on with codes like P0601, P0604, or P0606 (Internal Module Failure).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Unexplained drop in fuel economy.
- ✔ Stalling, stumbling, or misfiring while driving.
- ✔ Communication errors with your scan tool.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Installing your new 1998-2000 Blazer S10 PCM is a job most DIYers can handle in their own driveway. Follow these steps to get your vehicle back on the road.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most S10/Blazer/Jimmy models, the PCM is located in the engine bay, typically on the passenger side firewall or inner fender. On vans and full-size trucks, it may be near the battery or on the driver’s side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific procedure for your vehicle. This step is critical for the vehicle to start.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit a wide range of GM trucks, SUVs, and vans. Please verify your vehicle is on the list below. Providing your VIN is essential to ensure we program the correct software for your specific application and options.
CHEVROLET/GMC 1500/2500/3500 PICKUPS (1999-2000)
CHEVROLET SILVERADO/GMC SIERRA 1500 (1999-2000)
CHEVROLET TAHOE/GMC YUKON (1999-2000)
CHEVROLET SUBURBAN 1500/2500 (1999)
CHEVROLET EXPRESS/GMC SAVANA VANS (1999-2002)
CHEVROLET ASTRO/GMC SAFARI VANS (1999-2001)
OLDSMOBILE BRAVADA (1998-2000)
GMC ENVOY (1998-2000)
ISUZU HOMBRE (1998-2000)
CADILLAC ESCALADE (1999-2000)
…and more. Please check the full list for specific options and IDs.
Frequently Asked Questions
Frequently Asked Questions
Do I need to do anything after I install it?
Yes. While we program the module to your VIN, you will likely need to perform a security relearn procedure (often called a ‘key-on’ relearn) so your vehicle’s anti-theft system recognizes the new PCM. This procedure is simple and does not require special tools. Some applications may also require a Crankshaft Position Sensor variation relearn, which can be done with many professional-grade scan tools.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as it is required for programming.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each module is verified to be fully functional before being programmed with the latest GM software for your specific VIN.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original PCM (e.g., codes P0601-P0606), then yes, this part is the correct fix. However, if the light is on for another reason, like a bad oxygen sensor or a loose gas cap, you will still need to address that separate issue. This module will solve any problems directly related to the computer itself.
What if my part number isn’t listed?
The listed part numbers (16263494, 16265035, etc.) cover a wide range of applications. If your number is different, please contact us with your VIN and original part number. We can verify compatibility for you.