Restore Peak Performance to Your GM Truck or SUV
Is your 1998 or 1999 Chevrolet Tahoe, GMC Yukon, or Suburban running rough? Experiencing strange shifting, a persistent check engine light, or even a no-start condition? The Powertrain Control Module (PCM) is the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shift points. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. This replacement PCM is the definitive solution to restore your vehicle’s reliability and drivability.
We once had a ’99 GMC Suburban towed in that the owner was convinced needed a new 4L60E transmission. It was slamming into gear, shifting erratically, and sometimes wouldn’t shift out of first. The fluid was clean and the mechanicals seemed fine. After connecting a professional scan tool, we noticed the PCM was commanding erratic line pressure and would intermittently lose communication. Instead of a $3,000 transmission job, we installed a VIN-programmed PCM just like this one. After the quick security relearn, the truck was shifting perfectly, saving the customer a massive headache and thousands of dollars. It’s often the electronics, not the heavy hardware, that’s the root cause.
Symptoms of a Failing 1998-1999 Tahoe PCM
A failing powertrain control module can manifest in numerous ways. If your vehicle is exhibiting any of the following symptoms, a faulty PCM could be the culprit. Look out for:
- ✔ Check Engine Light: The light may be on with communication-related codes (U-codes) or false sensor codes that don’t resolve after replacing the sensor.
- ✔ Erratic Shifting: Harsh shifts, delayed engagement into gear, or getting stuck in one gear (limp mode) are classic signs of a PCM issue affecting the 4L60E or 4L80E transmission.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly at idle or while driving. You might also experience random misfires (P0300) that can’t be traced to spark plugs, wires, or coils.
- ✔ No-Start Condition: The engine may crank but refuse to start. This can be due to the PCM not firing the injectors or ignition coils.
- ✔ Poor Fuel Economy: If the PCM isn’t managing the engine’s fuel and air mixture correctly, you’ll notice a significant drop in gas mileage.
- ✔ Failed Emissions Test: An improperly functioning PCM will prevent the vehicle from passing an emissions or smog inspection.
The Plug-and-Play Solution: VIN-Programmed for Your Vehicle
Don’t settle for a generic module that requires an expensive trip to the dealership for programming. We take the guesswork and extra cost out of the equation. When you order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will use that information to flash the module with the latest, most up-to-date GM factory software specific to your truck’s engine, transmission, and options. This ensures that your new 1998-1999 Tahoe PCM is a true plug-and-play solution. Once installed, you will only need to perform a simple security relearn procedure, which can be done in your driveway without any special tools.
This module is a direct replacement for part numbers 09366810, 16250279, and 09355699, and fits a wide range of GM trucks, vans, and SUVs from that era, including the Chevrolet C/K pickups, Suburban, Express Van, GMC Sierra, Yukon, Savana, and Cadillac Escalade. Please verify the part number on your original module and consult our detailed fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for installation with the latest GM software for your specific vehicle.
What is the security relearn procedure?
This is a simple process required by GM’s anti-theft system (VATS/Passlock) to recognize the new PCM. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this sequence three times. The vehicle should then start. Instructions are readily available online for your specific model.
Will this fix my transmission shifting problems?
If the transmission problems are caused by faulty electronic commands from the PCM, then yes, this part is very likely to solve the issue. It’s a common failure point that is often misdiagnosed as a mechanical transmission failure.
How do I find the part number on my original module?
Your original PCM is typically located in the engine compartment, often on the driver’s side fender or near the battery. The part number, also called a service number, is printed on a sticker on the module’s case. It will be an 8-digit number.
Is any other setup required after installation?
In some cases, a Crankshaft Variation Relearn (CASE Relearn) may be needed to clear a P1336 trouble code and ensure accurate misfire detection. This procedure requires a bi-directional scan tool but is not always necessary for the vehicle to run and drive properly.