Restore Your Vehicle’s Brain and Get Back on the Road
Is your Oldsmobile Bravada or other GM truck suffering from baffling issues like stalling, erratic idling, a persistent Check Engine Light, or a no-start condition? The Powertrain Control Module (PCM) is the central computer of your vehicle, managing everything from fuel delivery and spark timing to transmission shifts. When it fails, it can cause a host of frustrating problems that are often misdiagnosed. This replacement PCM, part number 16265035, is the reliable, cost-effective solution to restore your vehicle’s performance and dependability.
We take the guesswork and expense out of the repair. Unlike a generic module from a parts store, this unit comes professionally flashed with the latest GM software updates, specifically programmed to your vehicle’s unique VIN. This means no extra trip to the dealership for costly programming. It’s designed to be a direct-fit, plug-and-play solution for the savvy DIYer or professional mechanic looking for a first-time fix.
A Technician’s Notebook: The Case of the Heat-Soaked PCM
I remember a 1999 GMC Jimmy with the 4.3L V6 that came into my shop with a complaint that stumped two other mechanics. The owner said it would run perfectly for about 20 minutes, then suddenly start sputtering, misfiring, and eventually stall. Once it cooled down, it would start right back up. We checked fuel pressure, ignition components, and sensors—all tested fine. On a hunch, I let the engine get to full operating temperature and then used a simple heat gun to gently warm the PCM case. Within a minute, the engine began to stumble. The issue was a hairline fracture on the PCM’s internal circuit board that would separate only when it got hot. Replacing the PCM with a properly programmed unit solved the problem instantly. These intermittent, heat-related failures are a classic symptom for this generation of 1998-2000 Bravada PCM and its counterparts.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty engine computer could be the culprit. A failing module can often trigger diagnostic trouble codes (DTCs) that point directly to an internal fault.
- âś” Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error), P0602 (Control Module Programming Error), or P0606 (ECM/PCM Processor Fault).
- âś” The engine cranks but refuses to start.
- âś” Unexplained drop in fuel economy.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Rough running, stalling, or hesitation during acceleration.
- âś” Loss of communication with your OBD-II scan tool.
DIY-Friendly Installation Guide
Installing your new, pre-programmed PCM is a straightforward process. While specific locations vary slightly by model, the general steps are the same. For a 1998-2000 Bravada PCM, you’ll typically find it in the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most S-10 platform vehicles (Blazer, Jimmy, Bravada, Sonoma), the PCM is located in the engine bay on the passenger side (RH side). On full-size vans and trucks, it’s often on the driver’s side (LH side) near the battery or firewall.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. There are typically multiple color-coded connectors. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt the new PCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle is now ready to start. In some cases, a security relearn or Crankshaft Variation (CASE) relearn procedure may be needed, which can be done with many professional-grade scan tools or by following a simple key-cycle procedure.
Will This Fit My GM Vehicle?
This module is a direct replacement for service number 16265035 and is also compatible with part numbers 16263494, 8162634940, 218-11787, and 21811787. It fits a wide range of popular GM models, including:
- âś” 1998-2000 Oldsmobile Bravada
- âś” 1998-2000 Chevrolet S10 / GMC Sonoma (4.3L)
- âś” 1998-2000 Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada / GMC Envoy
- âś” 1999-2002 Chevrolet Express & GMC Savana Vans (1500/2500/3500 Gasoline)
- âś” 1999-2000 Chevrolet Silverado & GMC Sierra 1500 (4.3L V6)
- âś” 1999-2000 Cadillac Escalade, Chevrolet Tahoe, GMC Yukon
- âś” 1998-2000 Isuzu Hombre (4.3L)
- âś” And many other GM trucks, vans, and SUVs from 1998-2002. Please verify your part number or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, simply send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We will program the module with the correct, updated software for your specific vehicle before we ship it.
Is this part truly plug-and-play?
Yes, because we program it to your VIN, it is ready for installation right out of the box. In most cases, you can install it and start the vehicle. Some vehicles may require a simple security relearn procedure, which does not require special tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original PCM (like codes P0601-P0606), this replacement module will solve the issue. It’s always best to have a proper diagnosis to ensure the PCM is the root cause.
Where is the VIN on my vehicle?
You can find your VIN on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this compatible with my 1999 Chevy Silverado with a V8?
This specific module, 16265035, is primarily for the 4.3L V6 engines in the trucks and various engines in the vans and SUVs. The fitment list shows it’s also used for some 5.0L and 5.7L applications in 1999. Always verify the service number on your original module or provide us with your VIN to guarantee a perfect match.