Restore Your GM Truck’s Core Performance and Reliability
Is your 1998-2000 Blazer, Jimmy, or S-10 suddenly stalling, refusing to start, or running rough? Are you chasing frustrating, intermittent issues that seem to have no solution? Before you spend another weekend replacing sensors or a fuel pump, the problem might be the very brain of your engine: the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen countless GM trucks from this era sidelined by a failing PCM. This isn’t just a part; it’s the central command center for your engine’s performance, fuel economy, and emissions. When it fails, it can create a cascade of baffling symptoms.
We solve this problem by providing a dependable, VIN-programmed PCM that’s ready to install right out of the box. Simply provide your vehicle’s VIN after purchase, and our experts will flash the module with the latest, most stable GM software for your specific vehicle. This eliminates the need for an expensive trip to the dealership for programming. This is the direct, effective solution to get your trusted truck or van back on the road with the performance you depend on. This 1998-2000 Blazer S10 PCM is your path to a lasting repair.
From the Diagnostic Bay
I remember a 1999 GMC Jimmy S15 that came into my shop on a tow truck. The owner had already replaced the fuel pump, spark plugs, and even the distributor, but it still had a persistent no-start condition. The engine would crank but never fire. After hooking up my scan tool, I saw no communication with the PCM. A quick check of the power and ground pins at the PCM connector confirmed the module itself was getting what it needed but wasn’t responding. The internal circuitry had failed—a common issue. We installed one of our VIN-programmed modules, performed the security relearn, and it fired up on the first try. The customer had spent hundreds on parts he didn’t need, when the core issue was the PCM all along.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Engine cranks but will not start.
- ✔ Intermittent stalling or shutting off while driving.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfires or rough idle even after a tune-up.
A Straightforward Guide to Installation
Installing your new 1998-2000 Blazer S10 PCM is a job most DIY mechanics can handle in their own driveway. Follow these steps for a successful replacement.
- 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 on the passenger’s side (RH side) near the firewall or inner fender.
- Disconnect Connectors: Carefully unplug the wiring harness connectors from the old PCM. These usually have a locking tab or lever that needs to be released. Avoid pulling on the wires themselves.
- 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 PCM: Mount the new, pre-programmed module in place and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: For many GM vehicles of this era, a security relearn procedure (also known as a CASE relearn) is necessary to sync the new PCM with your vehicle’s anti-theft system. This can typically be done without special tools. A common method is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times. Your vehicle’s specific procedure may vary slightly.
Verified Vehicle Compatibility
This module, part number 218-11787, is a direct replacement for service numbers 16263494 and 16265035. It is guaranteed to fit the following GM vehicles. Please verify your specific model and options.
- BLAZER S10/JIMMY S15: 1998 (w/build date opt ZN4), 1999-2000
- BRAVADA: 1998 (w/build date opt ZN4), 1999-2000
- S10/S15/SONOMA PICKUP: 1998 (4.3L, w/build date opt ZN4), 1999-2000 (4.3L)
- ENVOY: 1998 (w/build date opt ZN4), 1999-2000
- ISUZU HOMBRE: 1998 (4.3L, w/extended build date opt ZN4), 1999-2000 (4.3L)
- ASTRO / SAFARI VAN: 1999-2001 (ID 16263494)
- CHEVROLET/GMC 1500, 2500, 3500 PICKUPS (Gasoline): 1999-2000
- SILVERADO/SIERRA 1500 (6-Cylinder): 1999-2000
- TAHOE / YUKON: 1999-2000 (Classic & Denali models)
- SUBURBAN 1500/2500 (Gasoline): 1999
- ESCALADE: 1999-2000
- EXPRESS / SAVANA 1500, 2500, 3500 VANS (Gasoline): 1999-2002 (Verify ID 16263494 on some years)
Restoring your vehicle’s brain is the most critical repair you can make. With our pre-programmed 1998-2000 Blazer S10 PCM, you’re not just buying a part—you’re buying a reliable, long-term solution.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your old module to us. This is a direct purchase.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information, as the programming is specific to your truck.
Is any additional programming required after installation?
The module arrives fully programmed for your engine and transmission. However, you will likely need to perform a security relearn procedure (often called a CASE relearn) so the module can sync with your vehicle’s keys and anti-theft system. This procedure can usually be done at home without any special tools.
What if my part number is slightly different?
This module is a direct replacement for several part numbers, including 16263494 and 16265035. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like DTC P0601), then yes, this module will resolve the issue. However, if the light is on due to a faulty sensor or other component, that separate issue will still need to be addressed.