Is Your GM Vehicle Running Rough?
If you’re experiencing frustrating issues like a persistent check engine light, sudden stalling, poor fuel mileage, or a car that simply won’t start, the problem might be deeper than a simple sensor. The Powertrain Control Module (PCM), often called the engine computer, is the central command for your vehicle’s engine and transmission. When it fails, it can cause a cascade of confusing and unpredictable problems. This genuine used GM PCM, part number 09361735, is the reliable, cost-effective solution to get your vehicle back on the road and running as it should.
The Plug-and-Play Solution for Your 1999 Regal Engine Computer
Replacing an engine computer used to mean a costly trip to the dealership for installation and programming. We eliminate that hassle. When you purchase this module, we flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once it arrives, it’s ready for installation, communicating perfectly with all the other modules and sensors in your car. It’s the closest you can get to a plug-and-play fix, saving you time and hundreds of dollars in dealership fees.
From the Diagnostic Bay
We had a 1999 Pontiac Grand Prix come in that was driving the owner crazy. It would stall randomly at red lights, but not always. Sometimes it would hesitate on acceleration. The check engine light was on, but the codes were all over the place—misfire, O2 sensor, transmission communication error. After chasing our tails checking wiring and sensors, we hooked up a high-level scanner and saw the PCM was intermittently dropping communication. We sourced a tested, used module with the same part number (09361735), programmed it to the car’s VIN, and installed it. The car immediately ran perfectly. All the ghost codes vanished. It’s a classic case of a failing computer creating symptoms that point everywhere else.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light is on, and you may have error codes related to multiple, unrelated sensors or communication failures (U-codes).
- ✔ Engine Stalling or Misfiring: Your engine may run rough, stall unexpectedly, or misfire, especially under load.
- ✔ No-Start Condition: The engine cranks but refuses to start, indicating a potential lack of fuel or spark command from the PCM.
- ✔ Poor Performance & Fuel Economy: A noticeable drop in power, acceleration, and a significant increase in fuel consumption.
- ✔ Erratic Shifting: The automatic transmission may shift harshly, late, or not at all, as the PCM also controls its functions.
- ✔ Failed Emissions Test: The vehicle cannot pass an emissions or smog test due to persistent engine codes.
Guaranteed Compatibility
This engine computer, part number 09361735, is a direct replacement for a wide range of General Motors vehicles from the 1999-2000 model years. It is crucial that you match this part number to the one on your existing module to ensure proper function. This PCM is compatible with models such as the Buick Regal, LeSabre, Park Avenue; Pontiac Grand Prix, Bonneville, Montana; Chevrolet Impala, Lumina, Monte Carlo; and Oldsmobile Intrigue, Silhouette, among others. Please verify the part number on your original computer before ordering.
Installation Guide
Installation is straightforward for a DIY mechanic. First, always disconnect the negative battery terminal. Locate your existing PCM—it’s typically in the engine bay on the driver’s side (often part of the air filter housing) or under the dash. Carefully unplug the wiring harnesses and unbolt the module. Install the new module, reconnect the harnesses, and then reconnect the battery. Important: After installation, you may need to perform a security relearn procedure (often called VATS or Passlock/Passkey). This procedure is simple, requires no special tools, and involves cycling the key in the ignition. Instructions are widely available online for your specific model.
Frequently Asked Questions
Is this part ready to install when it arrives?
Yes! This is the major benefit of our service. We program the computer to the VIN you provide during checkout. This means it’s ready for installation and will communicate with your specific vehicle’s options and security system. A simple security relearn may be required after you install it.
What information do I need to provide?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). We cannot ship the part without it, as the programming is essential for it to function in your car.
Where can I find my VIN?
Your VIN is located on a small metal plate on the driver’s side of the dashboard, visible through the windshield. It is also printed on your vehicle’s registration and insurance documents.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. Each unit is inspected and guaranteed to work correctly once programmed and installed.
Will this fix my car’s problem?
This part will correct issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, it is essential to have your vehicle properly diagnosed. We recommend confirming the PCM is the point of failure before purchasing, as this is an electrical component.