Restore Peak Performance to Your GM Truck or SUV
Is your 1998 or 1999 Chevy Tahoe, Suburban, or GMC Yukon acting up? If you’re dealing with frustrating issues like intermittent stalling, a persistent check engine light, harsh transmission shifting, or a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can create a cascade of problems that are difficult to diagnose. This fully programmed PCM is the straightforward, reliable solution to get your truck running right again.
We take the guesswork and hassle out of the repair. Unlike pulling a random computer from a salvage yard, each unit we ship is meticulously programmed with the latest GM factory software updates using your vehicle’s specific VIN. This crucial step ensures that all engine and transmission parameters are perfectly matched to your truck’s original specifications, providing a true plug-and-play experience. This is the same process a dealership would use, but without the high cost and inconvenience.
From the Diagnostic Bay: The Ghost in the Machine
I remember a ’99 Suburban that came into my shop a few years back. The owner was at his wit’s end. He’d replaced the fuel pump, the ignition control module, and even the crank sensor chasing an intermittent stall that only happened after it was fully warmed up. No specific codes were stored, just a generic P0300 random misfire now and then. After confirming fuel pressure and spark were solid during the failure, I hooked up a high-level scan tool to monitor the PCM data. I saw the injector pulse width commands become erratic just before it would die. It was a classic case of internal PCM failure due to heat soak. We installed a VIN-programmed PCM just like this one, performed the quick security relearn, and the truck never stalled again. It’s a common failure point on these GMT400 platforms, and this part is the definitive fix.
Is Your Truck or Van Showing These Warning Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Persistent Check Engine Light (CEL) with internal module codes like P0601, P0602, P0605, or P0606.
- ✔ Vehicle refuses to start or stalls unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Engine performance issues like misfiring, hesitation, or rough idling.
Your Straightforward Installation Guide
Installing your programmed 1998-1999 Tahoe PCM is a job most DIYers can handle in under an hour. Follow these steps for a smooth installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay, typically on the driver’s side inner fender.
- Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. There are usually several color-coded connectors.
- Remove the Old Unit: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-attach the electrical connectors. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure (often called a CASE relearn or Passlock relearn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes. This allows the new PCM to sync with your vehicle’s anti-theft system. Consult your vehicle’s service information for the exact procedure.
Verified Fitment for Your GM Truck or Van
This engine computer is a direct replacement for multiple part numbers and fits a wide range of GM vehicles. To ensure compatibility, please match your original part number to one of the numbers listed below or verify your vehicle is on this list. This module replaces service ID 9355699 and part numbers 16250279, 09355699, 16266645, 16258815, 09366810, and 9366810.
- Cadillac Escalade: 1999
- Chevrolet/GMC Trucks (1500, 2500, 3500): 1998-1999
- Chevrolet/GMC Suburban (1500, 2500): 1998-1999
- Chevrolet Tahoe / GMC Yukon: 1998-1999
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma: 1998
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre: 1998
Note: This is a quality, tested used part sourced from a salvaged vehicle, which allows us to provide a reliable and affordable solution for your repair needs.
Frequently Asked Questions
1998-1999 Tahoe PCM
Will this fix my failed emissions test?
If the failed emissions test was caused by a Check Engine Light related to PCM operation (like an internal fault code), then yes, replacing the PCM is often the correct fix. This programmed will restore the proper engine management needed to pass the test.