Restore Peak Performance to Your GM Truck or SUV
If you’re dealing with frustrating engine problems in your 1998-1999 Tahoe, Yukon, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your engine, a faulty PCM can cause a cascade of issues, from a simple check engine light to a no-start condition that leaves you stranded. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and emissions. This tested, used PCM is the straightforward, cost-effective solution to get your truck back to running the way it should.
We take the guesswork and extra expense out of the repair. Unlike a generic module from a salvage yard, each unit we ship is professionally programmed with the latest GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This ensures perfect communication between the engine, transmission, and other onboard systems, restoring factory performance right out of the box. For many owners, this is the final piece of the puzzle to solve those persistent, hard-to-diagnose running problems.
Case Study: A Tricky Diagnosis
I once had a ’99 Suburban in my bay that was a real head-scratcher. The owner had replaced the fuel pump, injectors, and multiple sensors chasing an intermittent stalling issue that never set a consistent trouble code. On a hunch, I monitored the PCM’s live data stream and noticed the processor would occasionally drop sensor readings for a split second before recovering. It was a classic sign of an internal PCM failure that a standard code reader would miss. We installed a VIN-programmed PCM just like this one, and the truck has run flawlessly ever since. Sometimes the problem isn’t a sensor, but the computer reading it.
Is Your GM Truck or SUV Showing These Signs?
- ✔ Check Engine Light is on with codes like P0601 or P0606 (Internal Control Module Memory Check Sum Error).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Your PCM Swap
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine bay, typically on the driver’s side fender well or near the battery.
- ✔ Disconnect Connectors: Carefully unclip the wiring harness connectors. These older GM connectors often have a lever or tab that needs to be lifted to release them. Do not force them.
- ✔ Remove Mounting Bolts: Unbolt the PCM from its mounting bracket.
- ✔ Install the New PCM: Mount your replacement PCM and securely reconnect the wiring harnesses. You should hear a click as they lock into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn: Your vehicle may require a security relearn procedure (for Passlock systems) 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 model.
Verified Fitment for Your GM Vehicle
This module is a direct replacement for service numbers 09355699, 16266645, 9355699, 16250279, 16258815, and 9366810. It is confirmed to fit a wide range of GM models, including:
- ✔ 1998-1999 Chevrolet Tahoe / GMC Yukon
- ✔ 1998-1999 Chevrolet & GMC Suburban (1500/2500)
- ✔ 1998-1999 Chevrolet & GMC C/K Pickups (1500/2500/3500)
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500)
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Chevrolet Astro / GMC Safari
- ✔ 1998 Oldsmobile Bravada / GMC Envoy / S10 Blazer / S15 Jimmy
- ✔ 1998 Chevrolet S10 / GMC Sonoma / Isuzu Hombre (4.3L)
Please ensure your vehicle’s original module has one of the compatible part numbers listed above for guaranteed fitment.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the correct software for your truck’s specific engine, transmission, and options. This ensures it works perfectly right out of the box without a trip to the dealer.
Is this a new part?
No, this is a high-quality, tested used part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides a reliable fix at a fraction of the cost of a new dealer part.
Will I need to do anything else after installation?
In most cases, you will need to perform a simple Security Relearn Procedure, also known as a Passlock Relearn. This syncs the PCM to your vehicle’s anti-theft system. The procedure is easy and can be done in your driveway with just the ignition key.
What if my part number is slightly different?
This PCM replaces several part numbers, including 09355699, 16266645, and others listed. As long as your original module carries one of these numbers, this unit will be a compatible replacement.
How do I find my original part number?
The part number is printed on a sticker on the original PCM itself. You will need to locate the module in your engine bay to read it.