Restore Peak Performance to Your GM Vehicle
Is your 1999-2000 Pontiac Grand Prix, Bonneville, or other compatible GM vehicle suffering from perplexing issues like stalling, poor fuel economy, or a persistent Check Engine Light? The Powertrain Control Module (PCM), the electronic brain of your engine, is often the culprit. This vital component orchestrates everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the symptoms can range from minor annoyances to a complete no-start condition, leaving you stranded and frustrated. This listing is for a genuine, used OEM PCM with part number 09361735, meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) for a seamless and effective repair.
From the Diagnostic Bay
We recently had a 1999 Oldsmobile Intrigue come into the shop with a classic case of PCM failure. The owner complained of random stalling at traffic lights and a harsh 1-2 gear shift that seemed to have no pattern. We checked the fuel pressure, scanned for codes (which were intermittent and pointed to multiple unrelated sensors), and inspected the wiring. Everything seemed fine. It was only after monitoring live data that we noticed the ignition timing commands from the PCM were erratic just before a stall. We sourced a quality used module, programmed it to the car’s VIN, performed the necessary security and CASE relearn, and the car ran like new. It’s a perfect example of how a failing computer can mimic a dozen other mechanical problems, making correct diagnosis and a properly programmed replacement essential.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) on your dashboard.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Engine stalling, sputtering, or misfiring, especially when warm.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Importance of a Programmed 1999-2000 Grand Prix PCM
Simply swapping a used PCM from another vehicle will not work. Each module is coded with specific software and calibrations for the original vehicle’s engine, transmission, and options. Our process eliminates the guesswork and the need for expensive dealership programming. When you purchase this 1999-2000 Grand Prix PCM, you provide us with your VIN. We then use professional-grade equipment to flash the module with the latest, most stable software update available from General Motors for your exact vehicle configuration. This ensures all engine and transmission parameters are correct, restoring factory performance, drivability, and fuel economy. This unit arrives ready for installation, making your repair process significantly simpler.
Verified Vehicle Fitment
This module, part number 09361735, is a direct replacement for a wide range of GM vehicles. Please verify the part number on your original module and consult the list below to ensure compatibility:
- BONNEVILLE: 1999, 2000 (3.8L VIN K)
- CENTURY: 1999
- CUTLASS: 1999 (ID 9361735)
- EIGHTY EIGHT: 1999
- GRAND PRIX: 1999, 2000 (3.8L, incl. supercharged w/ opt K29)
- IMPALA: 2000 (3.4L & 3.8L)
- INTRIGUE: 1999
- LESABRE: 1999-2000
- LUMINA CAR: 1999
- MALIBU: 1999 (3.1L)
- MONTE CARLO: 1999-2000
- MONTANA: 1999
- PARK AVENUE: 1999
- REGAL: 1999
- RIVIERA: 1999
- SILHOUETTE: 1999
- TRANS SPORT: 1999 (Canada)
- VENTURE: 1999
Installation & Post-Installation Procedure
While this is a direct-fit part, proper installation is key. Always disconnect the vehicle’s battery before removing the old PCM. After installing the replacement, you may need to perform a security relearn procedure (often called a Passlock or VATS relearn) to allow the vehicle to start. Additionally, a Crankshaft Variation Relearn (CASE relearn) using a capable scan tool may be required to prevent a P1336 trouble code. We recommend installation by a qualified technician to ensure all necessary steps are completed.
Frequently Asked Questions
Do I need to send my old computer in (core charge)?
No, there is no core charge for this part. You can keep or dispose of your old module as you see fit.
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). This is crucial for us to program the module correctly for your specific vehicle’s configuration.
Is this a new part?
No, this is a high-quality, tested, used OEM part sourced from a salvaged vehicle. Each unit is inspected and then programmed with the latest GM software for your VIN before being shipped.
Will this PCM require additional programming at the dealership?
No. We program the module to your VIN before it ships, so it is ready to be installed. However, your technician may need to perform a security relearn and a CASE relearn procedure with a scan tool after installation for the vehicle to operate correctly.
What is a CASE Relearn?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with the crankshaft position sensor. If not performed, the engine may run fine, but you will likely have a persistent Check Engine Light with code P1336. This procedure requires a bi-directional scan tool.