Restore Peak Performance to Your GM Truck or SUV
Is your 1998-2000 Oldsmobile Bravada or other GM vehicle suffering from frustrating issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the computer that acts as your engine’s brain. A faulty PCM can disrupt everything from fuel delivery to ignition timing, leading to poor performance and reliability. This isn’t just an annoyance; it’s a critical component failure that needs a dependable solution.
This replacement PCM is the definitive fix. We take the guesswork and high dealership costs out of the equation. Before we ship it, we flash the module with the latest official GM software updates, programmed specifically to your vehicle’s VIN. This ensures perfect compatibility and function right out of the box, restoring the smooth operation and efficiency you expect from your vehicle. Don’t let a bad computer keep your trusty truck or SUV off the road.
Case Study: A Tricky Diagnosis
A customer brought in a ’99 GMC Jimmy with the 4.3L, complaining of random stalling and a check engine light that shops couldn’t seem to fix. They’d already replaced the fuel pump and ignition coil. My scan tool showed a P0601 (Internal Control Module Memory Check Sum Error) and intermittent communication loss. After verifying the wiring and grounds were solid—a crucial first step—I knew the PCM’s internal processor was failing. These older units are prone to failure from years of heat cycles and vibration. We installed one of our VIN-programmed modules, performed the security relearn, and the Jimmy ran perfectly. It’s a common failure I’ve seen hundreds of times on these GM platforms.
Is Your Vehicle Showing These Symptoms?
A failing PCM can cause a wide range of problems. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0604, P0606, or U-series communication codes
- ✔ Engine stalling or shutting off while driving
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to start or intermittent starting issues
- ✔ Noticeable decrease in fuel economy
- ✔ Failing a state emissions inspection
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle in under an hour with basic hand tools. Our pre-programming service eliminates the need for expensive dealer tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old PCM: On most of these vehicles, the PCM is located in the engine bay, often on the driver’s or passenger’s side fender well or near the battery. Refer to the fitment list for its specific location on your model.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. They have locking tabs that may need to be gently pried up. Inspect the connectors for any corrosion or damage.
- Remove the Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): Some GM vehicles require a simple security relearn procedure to allow the vehicle to start. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit the following vehicles. Please confirm your specific model and options.
GMC 1500/2500/3500 PICKUP (99-00), SIERRA 1500 (99-00), ENVOY (98-00), JIMMY S15 (98-00), SAFARI (99-01), SAVANA 1500/2500/3500 VAN (99-02), SONOMA (98-00), YUKON (99-00)
CADILLAC ESCALADE (99-00)
OLDSMOBILE BRAVADA (98-00)
ISUZU HOMBRE (98-00)
Note: Some 1998 models require build date option ZN4. Please verify your vehicle’s specifications.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information.
Is any additional programming required after installation?
No. This PCM comes fully flashed with the latest GM software for your specific VIN. In some cases, a simple ‘Security Relearn’ or ‘Crankshaft Variation Relearn’ may be needed, which can be done without special tools. Instructions are widely available online or in service manuals.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (like code P0601), then yes, this part will resolve the issue. However, you should always ensure other potential causes (sensors, wiring) have been properly diagnosed first.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) typically controls both the engine and transmission, while an ECM (Engine Control Module) only controls the engine. For these GM vehicles, this unit functions as the PCM.
Is this a used part?
This is a high-quality, tested, and verified component that has been professionally prepared and programmed for your vehicle. It is guaranteed to restore your vehicle’s functionality.