Restore Your Truck’s Heartbeat with a Reliable, Programmed PCM
Is your 1998 or 1999 Chevy Tahoe, Suburban, or GMC Yukon giving you headaches? If you’re dealing with frustrating no-start conditions, a rough idle that shakes the whole truck, poor fuel mileage, or a persistent Check Engine Light, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer, when it falters, your vehicle’s performance suffers. This isn’t just an inconvenience; it can leave you stranded. This tested, OEM engine computer is your direct-fit, reliable solution to get your truck back on the road and running strong.
We take the guesswork and dealer expense out of the equation. Each module is meticulously programmed with the latest official GM software updates tailored specifically to your vehicle’s VIN. This means you’re not just getting a replacement part; you’re getting a component with improved logic that can resolve factory-known drivability issues. This is the smart, effective fix for both seasoned mechanics and determined DIYers looking to save time and money.
Case Study: A Tricky Diagnosis
A customer brought in a ’99 Suburban 1500 with a complaint that stumped a couple of other shops: it would randomly stall at stoplights, but only when the engine was hot. There were no consistent trouble codes, just an occasional P0601 (Internal Control Module Memory Check Sum Error) that would appear and disappear. After verifying fuel pressure and ignition components were solid, I focused on the 1998-1999 Tahoe PCM. On these GMT400 platforms, heat soak in the engine bay can expose failing internal processors in the PCM. We swapped in one of our pre-programmed units, and the problem vanished instantly. It’s a classic failure I’ve seen dozens of times, where the symptoms are elusive until the computer finally gives out.
Is Your Truck Showing These Symptoms?
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when warm.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A significant drop in fuel economy.
- ✔ Persistent Check Engine Light with codes like P0601, P0606, or other communication errors.
- ✔ Failure to pass an emissions or smog test.
- ✔ Inconsistent or non-working gauges.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine compartment on the driver’s side, often near the fender or firewall. It’s a silver box with multiple large wiring harness connectors.
- ✔ Disconnect the Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. Take care not to damage the locking tabs.
- ✔ Swap the Module: Unbolt the old PCM from its mounting bracket and remove it. Install the new module in its place and secure the bolts.
- ✔ Reconnect Everything: Firmly plug all wiring harnesses back into the new PCM. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: This step is crucial. You must perform the GM Passlock security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle will not start until this is completed.
Will This Fit My Truck or Van?
This PCM is a guaranteed fit for a wide range of GM vehicles. While it’s a primary replacement for the 1998-1999 Tahoe PCM, it also fits many others. Please verify your original part number matches one of these: 09355699, 16266645, 16250279, 16258815, 09366810, or 9366810. Key compatible models include:
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Suburban & GMC Yukon / Yukon XL (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500 Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 S10/S15/Sonoma, Blazer/Jimmy, Bravada, Envoy, Isuzu Hombre (4.3L V6)
Frequently Asked Questions
What information do you need from me after I order?
After your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We need this to program the module with the correct, updated software for your specific truck or van.
Is this part ready to install out of the box?
Yes, it comes programmed to your VIN. The only additional step required after physical installation is the security relearn procedure, which syncs the module to your vehicle’s anti-theft system. This procedure does not require special tools.
Why choose a tested, used OEM part over a new one?
A used OEM part offers the perfect balance of reliability and value. You get a genuine GM component, which ensures proper function and fitment, at a fraction of the cost of a new module from a dealer. Each one is tested and flashed with the latest software for optimal performance.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can cause erratic shifting, delayed engagement, or incorrect gear selection. Replacing a faulty PCM often resolves these communication-based transmission issues.
What if my part number is slightly different?
This module is a direct replacement for several part numbers, including 16266645, 16250279, and others listed above. As long as your original module’s part number is on our compatibility list, this unit will work perfectly for you.