Restore Peak Performance to Your GM Truck or Van
Is your trusty 1998-1999 Chevrolet 1500 Pickup suddenly running rough, refusing to start, or showing a persistent Check Engine Light? Before you start throwing parts at it, the problem could be its electronic brain: the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can create a cascade of baffling issues. This isn’t just a part; it’s the central command for your engine and transmission, and when it falters, your vehicle’s reliability and performance suffer.
We offer a dependable, cost-effective solution. This is a thoroughly tested, used OEM Powertrain Control Module that we program specifically for your vehicle using your VIN. This ensures it arrives with the latest GM software updates, ready for a straightforward installation. You get a reliable part that restores factory operation without the high cost and hassle of a dealership visit for programming.
From the Diagnostic Bay
I remember a 1999 GMC Yukon that came into the shop with a complaint of erratic shifting and a random stalling issue. The owner had already replaced the throttle position sensor and the mass airflow sensor, spending hundreds with no fix. The codes were all over the place. After checking the power and grounds to the PCM, we found they were solid. The issue wasn’t the sensors; it was the computer itself providing faulty data. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the truck ran perfectly. This case highlights why correctly diagnosing the PCM is crucial—it can save you a lot of time and money on unnecessary parts.
Is Your Vehicle Exhibiting These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for these common signs:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle stalls intermittently, especially when warm.
- ✔ Communication errors with your scan tool.
- ✔ Apparent failure of multiple unrelated sensors at once.
A Straightforward Guide to Installation
Replacing the 1998-1999 Chevrolet 1500 PCM is a manageable job for a DIYer or professional mechanic. Our pre-programming service eliminates the most difficult step.
- 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 compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM into the bracket and securely reconnect the wiring harnesses.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: This is a critical step. You will need to perform the GM Passlock/VATS security relearn procedure. This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle will not start until this is completed.
Verified Vehicle Compatibility
This module, identified by service number 16258815 or ID 9355699, is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number or contact us with your VIN to confirm compatibility. This part fits the following vehicles:
- 1998-1999 Chevrolet/GMC 1500, 2500, 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet Suburban 1500/2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1999 Cadillac Escalade
- 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- 1998 Chevrolet Astro & GMC Safari
- 1998 Oldsmobile Bravada (w/o build date opt ZN4)
- 1998 GMC Envoy (w/o build date opt ZN4)
- 1998 Chevrolet S10 / GMC Sonoma (4.3L, w/o build date opt ZN4)
- 1998 Chevrolet Blazer / GMC Jimmy (w/o build date opt ZN4)
- 1998 Isuzu Hombre (4.3L, w/o extended build date opt ZN4)
Frequently Asked Questions
Do I need to do any programming myself?
No. We flash the module with the latest GM calibration for your specific VIN before we ship it. The only procedure you need to perform is the security relearn, which requires no special tools.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It involves a sequence of key-on/key-off cycles. We include instructions, and it’s easily found online for your specific model. Your vehicle will not start until this is done.
Is this a new part?
No, this is a genuine, used OEM part sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your order without it. Please double-check it for accuracy.
Will this fix my transmission problems?
In many cases, yes. The PCM also controls transmission functions like shift points and line pressure. If your transmission issues are electronic in nature and caused by a faulty PCM, this part will resolve them. It will not fix internal mechanical failures of the transmission.