Is Your 1998 Bravada or GM Truck Running Rough? The PCM Might Be the Culprit.
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic engine behavior, stalling, or a no-start condition in your 1998 Oldsmobile Bravada or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a very likely cause. The PCM is the central computer, the brain of your vehicle’s engine and transmission operations. When it fails, it can create a cascade of problems that are often difficult to diagnose, leading to wasted time and money on unnecessary repairs.
This is a genuine, used OEM Powertrain Control Module, service number 16266645 (interchangeable with 09355699 and others listed), that has been meticulously tested and is ready to be programmed specifically for your vehicle. We take the guesswork out of the repair by flashing the module with the latest GM-certified software updates using your vehicle’s unique Vehicle Identification Number (VIN). This ensures that all factory settings, security protocols (like GM’s Passlock system), and specific operational parameters for your engine and transmission are perfectly matched, providing a true plug-and-play solution.
From the Diagnostic Bay
We had a ’98 GMC Jimmy in the shop that was driving the owner crazy. It would start fine cold, but after about 15 minutes of driving, it would intermittently stall at stoplights. No consistent codes, just a random P0300 (Random Misfire) every now and then. We checked fuel pressure, spark, and vacuum lines—all were perfect. On a hunch, we monitored the PCM’s data stream while tapping on the case. We saw the injector pulse width data drop out right before it would stall. The internal circuits of the original PCM were failing under heat. We installed one of these VIN-programmed units, performed the security relearn, and the Jimmy ran like new. It’s a classic example of how a failing computer can mimic a dozen other problems.
Symptoms of a Failing GM PCM
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Vehicle refuses to start or has difficulty starting
- ✔ Unexplained stalling or rough idling
- ✔ Poor engine performance and reduced power
- ✔ Decreased fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Communication errors with diagnostic scan tools
The Critical Importance of VIN Programming
You cannot simply take a PCM from another vehicle and install it in yours. On these late-90s GM vehicles, the PCM is a critical component of the vehicle’s anti-theft system (Passlock/VATS). It is tied directly to your specific VIN. Our process ensures this connection is correctly established before the part ever leaves our facility. By providing us with your VIN after purchase, you receive a module that is ready for installation, saving you a costly trip to the dealership for programming. This 1998 Bravada PCM Engine Computer will be loaded with the correct software for your exact make, model, engine, and transmission configuration.
Installation is Straightforward
While professional installation is always recommended, replacing the PCM is a manageable task for a confident DIY mechanic. The module is typically located in the engine bay. The basic steps involve disconnecting the vehicle’s battery, carefully unplugging the wiring harnesses from the old module, unbolting it from its bracket, and installing the new one in its place. After installation, a ‘Security Relearn Procedure’ may be necessary to sync the new PCM with your vehicle’s anti-theft system. This procedure is simple and can be done without special tools, typically involving a sequence of key turns.
This module is a direct replacement for a wide range of 1998-1999 GM trucks, vans, and SUVs. Please verify your original part number or consult the detailed fitment list to confirm compatibility with your specific vehicle. Restore the reliability and performance of your vehicle with this pre-programmed, quality-tested PCM.
Frequently Asked Questions
Do I need to send you my old computer?
No, there is no core charge or need to send your old module to us. This is an outright purchase.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. This is absolutely essential for us to program the computer correctly for your specific vehicle configuration.
Is this part difficult to install?
Installation is relatively simple. It involves disconnecting the battery, removing the old module, and plugging in the new one. However, you will likely need to perform a security relearn procedure, which involves a series of key cycles. We can provide instructions for this procedure.
Will this fix my vehicle’s problem?
This PCM will fix any issues directly caused by a faulty computer. While the symptoms listed are common for PCM failure, it’s crucial to have your vehicle properly diagnosed to ensure the PCM is the root cause of the problem. This part will not solve issues related to other faulty sensors or mechanical components.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. It is guaranteed to be functional and is programmed with the latest software for your vehicle.