Is Your GM Truck or SUV Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, stalling, or a no-start condition in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is a likely culprit. The PCM is the electronic brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety.
I once had a ’99 Chevy Tahoe in the shop that was driving the owner crazy. It would randomly stall at red lights and sometimes refuse to start for an hour. He had already replaced the fuel pump and ignition coil based on advice from forums. We scanned it and found a slew of intermittent communication codes. Before condemning the expensive PCM, we spent an hour checking the basics: battery voltage, main power feeds, and especially the ground straps from the engine to the frame. Sure enough, we found a corroded ground strap near the firewall. A new $15 strap and 30 minutes of cleaning the contact points fixed the truck completely. The original PCM was fine. It’s a stark reminder: always verify power and grounds to the module before replacing it. A faulty ground can mimic all the symptoms of a bad computer.
Your Direct-Fit Solution: The Programmed 1998 Bravada PCM
Stop chasing ghosts in your electrical system. This genuine, used OEM Powertrain Control Module, service number 09355699, is the definitive solution for a wide range of 1998-1999 GM trucks, vans, and SUVs. Unlike a generic part from a local auto parts store, this unit is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the module has the correct software and calibrations for your engine, transmission, and factory options, eliminating compatibility issues and the need for an expensive trip to the dealership for programming.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various communication or sensor codes (e.g., U-codes, P0601-P0606).
- ✔ Engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ Stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
- ✔ Inconsistent or non-functional dashboard gauges.
Why Choose a VIN-Programmed Module?
In modern vehicles, the PCM is tied to the vehicle’s security system (like GM’s Passlock or Passkey systems). Simply swapping a module from another vehicle will often result in a no-start condition because the security credentials don’t match. Our process handles the heavy lifting for you. By providing your VIN at checkout, you receive a module that is ready for installation. In most cases, you will only need to perform a simple security relearn procedure, which can be done in your driveway without any special tools. This plug-and-play approach saves you hundreds of dollars in dealership labor and programming fees.
This unit is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 09366810. Please verify the part number on your original module to ensure a perfect match. This single part covers an extensive list of popular vehicles, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, S10/Blazer, Astro/Safari, and many more. Refer to the detailed fitment list to confirm compatibility with your exact model and options.
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 the engine and transmission to ensure optimal performance, fuel efficiency, and emissions. It takes data from sensors all over the vehicle and makes real-time adjustments to fuel delivery, spark timing, and gear shifts.
Does this part really come programmed?
Yes. After you place your order, you must provide us with your vehicle’s 17-digit VIN. We use this to load the latest GM-certified software and calibrations specific to your vehicle onto the module before we ship it to you.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. This ensures perfect factory fitment and operation, often at a fraction of the cost of a new unit.
What is the security relearn procedure?
The security relearn, or anti-theft relearn, syncs the new PCM with your vehicle’s existing anti-theft system. It typically involves a sequence of turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for a few seconds, and repeating this cycle three times. Instructions are readily available online for your specific model.
How do I find the part number on my old PCM?
Your PCM is usually located in the engine bay, often on the driver’s side fender or near the battery. It’s a metal box with several large wiring harness connectors. The part number, often called the Service Number, is printed on a sticker on the case. It will be an 8-digit number like 09355699.
What happens after I place my order?
After purchasing, please send us a message with your vehicle’s VIN. We cannot program or ship the module without it. Once we receive your VIN, we will program the module within 1-2 business days and then ship it to you.