Restore Your Truck’s Heartbeat and Drive with Confidence
Is your trusty GMC or Chevy truck suddenly feeling unpredictable? Stalling at stoplights, shifting erratically, or throwing a stubborn check engine light? The Powertrain Control Module (PCM) is the central command center of your vehicle, managing everything from fuel mixture and spark timing to transmission shifts. When it begins to fail, it can create a cascade of frustrating and seemingly unrelated problems, turning your reliable workhorse into a source of daily stress. This isn’t just a part replacement; it’s about reclaiming the dependable performance and peace of mind you deserve from your vehicle.
This replacement PCM is your direct solution. It arrives meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN), loaded with the latest GM software updates. This critical step eliminates the need for expensive dealership programming, making the installation process straightforward for both seasoned mechanics and determined DIYers. Get ready to solve those nagging issues and feel that smooth, responsive power you’ve been missing.
Warning Signs Your PCM Needs Attention
- ✔ Persistent Check Engine Light: Especially with communication error codes like P0601, P0605, or P0606.
- ✔ Erratic Engine Behavior: Unexplained stalling, rough idling, hesitation during acceleration, or sudden drops in power.
- ✔ Poor Fuel Economy: A sudden, noticeable decrease in your miles per gallon can indicate the PCM is no longer managing fuel delivery efficiently.
- ✔ Harsh or Incorrect Shifting: The PCM controls transmission logic, and a fault can lead to jerky shifts, or getting stuck in a gear.
- ✔ Engine No-Start Condition: If the PCM fails to command the fuel pump or ignition coils, your truck may crank but refuse to start.
- ✔ Failure to Communicate: Your scan tool is unable to connect with the vehicle’s computer, pointing directly to a module issue.
From the Shop Floor: The Ghost in the Machine
“A customer brought in his ’99 Silverado with a classic case of ‘parts cannon’ fatigue. He’d replaced the plugs, wires, cap, rotor, and even the fuel pump trying to chase down a random misfire (P0300) and stalling issue. He was frustrated and out of patience. We hooked up our scope and saw the injector pulse width was all over the place—something was giving them bad commands. Instead of firing more parts at it, we tested the PCM’s driver circuits. Sure enough, the module was failing internally. We installed a VIN-programmed unit, performed the quick security relearn, and the truck ran like it just rolled off the line. It’s a powerful reminder that sometimes the problem isn’t the soldiers, but the general giving the orders.”
Guided Installation for a Lasting Fix
Installing your new 1998-1999 GMC 1500 PCM is a manageable job that can be completed with basic hand tools. Follow these steps to get your truck back in top form.
- Safety First: Always disconnect the negative terminal of your vehicle’s battery and secure it away from the post to prevent any electrical mishaps.
- Locate the PCM: On most GMT400 trucks like the C/K 1500, Tahoe, and Yukon, the PCM is located in the engine bay on the driver’s side, often near the fender or firewall. It’s a metal box with several large multi-pin electrical connectors.
- Disconnect the Old Unit: Carefully unplug the electrical connectors. There are typically release tabs or levers that need to be actuated. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM securely onto the bracket. Reconnect the electrical harnesses, ensuring they click firmly into place. The connectors are keyed and will only fit one way.
- Reconnect Power: Re-attach the negative battery terminal and tighten it securely.
- Perform Security Relearn (If Needed): Turn the key to the ‘ON’ position (without starting) for 10-15 minutes. Turn it ‘OFF’ for 10 seconds. Repeat this cycle 2-3 times. This allows the vehicle’s anti-theft system to sync with the new PCM. Your truck should now start and run smoothly.
Tailored Fit for Your GM Vehicle
This module is a direct replacement for service number 09366810 and is compatible with part numbers 16250279 and 09355699. Please verify your part number and check the extensive list below to confirm compatibility with your specific make, model, and engine.
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16250279
GMC 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
SAFARI (GMC) 98-99 Electronic Control Module; (LH front by battery), ID 16250279
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16258815
YUKON 98-99 Electronic Control Module; (LH engine compartment), ID 16250279
GMC 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16250279
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 16250279
EXPRESS 3500 VAN 98 Electronic Control Module; gasoline, ID 16250279
EXPRESS 2500 VAN 98 Electronic Control Module; gasoline, ID 16250279
ASTRO 99 Electronic Control Module; (LH front by battery), (4.3L), ID 16250279
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16250279
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16250279
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16250279
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 16258815
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 16250279
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 16258815
EXPRESS 1500 VAN 98 Electronic Control Module; ID 16250279
SAVANA 2500 VAN 98 Electronic Control Module; gasoline, ID 16250279
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16258815
CHEVROLET 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
SAVANA 3500 VAN 98 Electronic Control Module; gasoline, ID 16250279
SUBURBAN 1500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
TAHOE 98-99 Electronic Control Module; gasoline (LH engine compartment), ID 16250279
ASTRO 98 Electronic Control Module; (LH front by battery), ID 16250279
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 16258815
SUBURBAN 2500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 16250279
SAVANA 1500 VAN 98 Electronic Control Module; ID 16250279
CHEVROLET 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
CHEVROLET 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16250279
GMC 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to load the exact, correct software from GM for your truck’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box.
Is this a simple plug-and-play installation?
Yes, for the most part. Because we program the unit beforehand, you will not need a dealer-level scan tool. You simply install the module and may need to perform a simple key-cycle security relearn procedure, which takes about 30 minutes and requires no special tools.
Will this fix my check engine light?
If the check engine light and performance issues are caused by a faulty PCM, then yes, this part is the definitive solution. It is crucial to properly diagnose the issue first, as other failing sensors can sometimes mimic PCM symptoms.
What is a CASE relearn and will I need to do one?
A Crankshaft Variation Relearn (CASE) syncs the new PCM with the crankshaft position sensor. While the truck will run without it, you may have a P1336 trouble code. Most professional scan tools can perform this procedure in a few minutes, and many local repair shops can do it for a small fee.
Is there a warranty on this part?
Yes, all our powertrain control modules come with a comprehensive warranty. Please see the warranty tab on this page for specific details and duration, giving you confidence in your purchase.