Restore Your Vehicle’s Core Performance
Is your Oldsmobile Bravada, Chevy S10, GMC Jimmy, or another compatible GM vehicle suffering from perplexing issues like erratic shifting, poor fuel economy, a no-start condition, or a persistent Check Engine Light? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing engine and transmission functions. When it fails, it can cause a wide range of frustrating problems that can be difficult to diagnose. This direct-fit replacement PCM, part number 21811787, is the definitive solution to restore your vehicle’s original performance and reliability.
Unlike generic modules from a salvage yard, this unit comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the latest GM software updates and is perfectly calibrated for your engine, transmission, and factory options. This eliminates compatibility issues and the need for expensive dealership programming, making installation straightforward for both DIY mechanics and professional technicians.
From the Diagnostic Bay
We had a 1999 GMC Jimmy in the shop that was driving the owner crazy. It would randomly stall at stoplights and had a harsh 1-2 shift that felt like being rear-ended. No codes were stored consistently, making it a diagnostic nightmare. After checking all the usual suspects—fuel pressure, sensors, wiring—we focused on the PCM. We swapped in this pre-programmed module, performed a quick security relearn, and the difference was night and day. The engine idled smoothly, the transmission shifted like new, and the stalling issue was completely gone. It’s a reminder that sometimes the ‘brain’ is the source of the most mysterious symptoms.
Solving Problems with a 1998-2000 Bravada PCM
A failing PCM doesn’t just impact performance; it can affect safety and drivability. This module directly communicates with critical systems, managing everything from fuel injector pulse width and spark timing to transmission shift points and torque converter lockup. By replacing your faulty unit with this correctly programmed module, you are not just swapping a part—you are restoring the precise operational logic that your vehicle was designed with from the factory.
Common Symptoms of a Faulty PCM
- ✔ Check Engine Light is on with various communication or sensor codes.
- ✔ Vehicle fails to start or stalls intermittently.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine misfires, stumbles, or runs poorly.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Issues with anti-theft system engagement.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. Please provide your VIN upon purchase so we can ensure the unit is flashed with the correct software for a seamless installation. Get your truck or SUV back on the road and running right with a reliable, correctly programmed PCM.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle the programming for you before shipment. Simply provide us with your vehicle’s VIN during checkout, and the module will arrive with the latest GM software, ready to be installed.
What are the most common signs of a failing 1998-2000 Bravada PCM?
The most common symptoms include a persistent check engine light, stalling, rough idling, poor shifting, and a complete no-start condition. Because the PCM controls so many functions, symptoms can vary widely.
Where is the PCM located on my vehicle?
On most compatible models like the S10/Blazer/Jimmy/Bravada, the PCM is located in the engine compartment on the right-hand (passenger) side. On Express/Savana vans, it’s typically in the left-rear of the engine compartment. Always consult a service manual for your specific vehicle to confirm the location before beginning work.
Will I need to perform any other procedures after installation?
In most cases, you will need to perform a security relearn procedure, also known as a Passlock or VATS relearn. This is a simple procedure that typically involves turning the key on for 10-15 minutes, then off, and repeating two more times. This syncs the new PCM with your vehicle’s anti-theft system. Instructions can be easily found online for your specific model.
Is this a new or used part?
This is a high-quality, inspected, and tested used OEM component that has been professionally programmed and verified to meet or exceed original factory specifications.