Is Your GM Truck or SUV Running Rough?
If your 1998 Oldsmobile Bravada, Chevrolet S10, GMC Jimmy, or another compatible GM vehicle is experiencing perplexing issues like stalling, poor fuel economy, a persistent check engine light, or erratic transmission shifting, the culprit is often a failing Powertrain Control Module (PCM). As the central computer, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can create a cascade of problems that are difficult to diagnose.
The Direct Solution: A VIN-Programmed 1998 Bravada PCM
Don’t let a faulty computer keep you off the road. This replacement PCM, part number 9355699, is the reliable and cost-effective solution to restore your vehicle’s performance and dependability. We take the guesswork out of the replacement process. Before this unit ships, we program it specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that it has the correct software and the latest updates from GM, making it ready for installation right out of the box. This is a genuine, used OEM part sourced from a salvaged vehicle, offering original factory performance without the new-part price tag.
Expert Pro Tip
After installing this PCM, you will likely need a certified mechanic with a capable scan tool to perform a Crankshaft Variation Relearn procedure, also known as a CASE Relearn. This synchronizes the new PCM with your engine’s crankshaft position sensor. Skipping this step will almost certainly result in a Check Engine Light with code P1336 and may cause drivability issues. It’s a quick procedure for any professional shop and is critical for a successful installation.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light stays on, often with codes that seem unrelated or won’t clear.
- ✔ Poor Engine Performance: You may experience rough idling, hesitation, stalling, or a significant loss of power.
- ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the engine’s fuel delivery, leading to more trips to the pump.
- ✔ Transmission Issues: Hard or delayed shifting can be a sign that the PCM is not communicating correctly with the transmission.
- ✔ No-Start Condition: In severe cases, the vehicle may crank but refuse to start because the PCM isn’t managing spark or fuel.
- ✔ Failed Emissions Test: Incorrect air/fuel mixtures managed by a faulty PCM will lead to an automatic failure at the emissions station.
Simple Ordering and Installation Process
Getting your vehicle back to factory-spec operation is straightforward. After placing your order, simply provide us with your vehicle’s VIN. Our technicians will handle the programming, ensuring the module is a perfect match for your specific make, model, and engine configuration. This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. Please verify the extensive fitment list to confirm compatibility with your vehicle.
Frequently Asked Questions
Do I need to get this computer programmed?
No, we handle the programming for you before it ships. You must provide us with your vehicle’s VIN at checkout so we can load the correct GM software and updates for your specific vehicle.
Is this part difficult to install?
Physically, the installation is straightforward for a DIYer with basic tools. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. However, as noted in our Pro Tip, a final Crankshaft Variation Relearn (CASE Relearn) procedure is required with a professional scan tool for the job to be complete.
What does a PCM actually do?
The Powertrain Control Module (PCM) is the main computer that controls your vehicle’s engine and transmission systems. It takes data from dozens of sensors to manage fuel injection, spark timing, emissions systems, and automatic transmission shifting to ensure optimal performance, efficiency, and low emissions.
How can I be sure my old PCM is the problem?
Diagnosing a bad PCM can be tricky. It’s best to have a qualified mechanic rule out other potential causes like faulty sensors, wiring issues, or fuel system problems. Common indicators of a bad PCM include multiple random trouble codes, no communication with a scan tool, or stalling for no apparent reason when the engine is warm.
Will this fit my 1999 Chevy Silverado?
Yes, this PCM fits a very wide range of GM trucks, vans, and SUVs from the late 1990s, including many Chevrolet, GMC, Oldsmobile, and Cadillac models. Please check the detailed fitment list on this page to confirm compatibility with your exact year, make, model, and engine.