Is your 1998-2000 Oldsmobile Bravada, Chevy S10, GMC Jimmy, or other compatible GM vehicle suffering from perplexing issues like poor fuel economy, erratic shifting, or a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. A faulty PCM can lead to a cascade of problems, making your vehicle unreliable and frustrating to drive. This replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
The PCM is the brain of your vehicle’s operation. It constantly analyzes data from sensors throughout the engine and drivetrain to precisely control fuel injection, ignition timing, transmission shift points, and emissions systems. When this critical component begins to fail, the signals become corrupted, leading to the symptoms you’re experiencing. Simply replacing the module with a used one from a junkyard is not a solution, as it won’t be programmed for your vehicle’s specific configuration and security system.
From the Diagnostic Bay
We had a 1999 GMC Sonoma with the 4.3L V6 come into the shop with a complaint of a harsh 1-2 shift and intermittent stalling at stoplights. The owner had already replaced the throttle position sensor and the mass airflow sensor, but the problem persisted. After hooking up our scanner, we noticed erratic data coming from the PCM. Instead of chasing more phantom sensor failures, we identified the root cause: internal failure of the PCM’s driver circuits. We installed a VIN-programmed module just like this one, performed the security relearn procedure, and the truck ran and shifted like new. It’s a reminder that sometimes the issue isn’t a sensor, but the computer interpreting the data.
Common Symptoms of a Failing 1998-2000 Bravada PCM
If you’re experiencing any of the following issues, a failing PCM is a likely culprit. Replacing it can resolve these problems and prevent further damage to your engine or transmission.
- ✔ Check Engine Light: The most common indicator, often with codes related to sensors, misfires, or transmission solenoids.
- ✔ Poor Shifting: Harsh, delayed, or erratic automatic transmission shifts.
- ✔ Engine Performance Issues: Stalling, rough idling, hesitation, or misfires.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, wasting fuel.
- ✔ No-Start Condition: The PCM may fail to control the fuel pump or ignition system, preventing the vehicle from starting.
- ✔ Failed Emissions Test: Improper engine management leads to high emissions levels.
A True Plug-and-Play Solution
We take the guesswork and dealer expense out of the equation. This module is not just a part; it’s a complete service. When you place your order, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most up-to-date software directly from GM for your specific vehicle. This ensures that all factory parameters for your engine, transmission, and options are perfectly matched. This VIN-specific programming is critical for a successful repair of your 1998-2000 Bravada PCM and ensures it communicates correctly with all other modules on your vehicle.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. It fits a wide array of popular GM trucks and vans, making it a versatile and reliable choice for your repair needs. Please verify the part number and consult the detailed fitment list to confirm compatibility with your exact model.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, from fuel mixture and spark timing to transmission shifting, to ensure optimal performance, fuel economy, and emissions.
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact factory software and calibrations for your specific vehicle’s engine, transmission, and options. This step is essential for the module to function correctly and is a service that dealers charge hundreds for.
Is this part difficult to install?
The physical installation is straightforward, typically involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new module, you may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn), which can usually be done without special tools. Instructions can be readily found online for your specific vehicle.
Will this fix my check engine light?
If the check engine light is on due to a fault within the PCM itself, then yes, this replacement module will resolve the issue and turn off the light after installation. However, if the light is on due to a separate faulty sensor or component, that part will still need to be addressed.
Is this a new or used part?
This is a professionally prepared, high-quality replacement part that has been tested to meet or exceed original equipment specifications. It is programmed with the latest software to ensure peak performance and longevity.