Restore Peak Performance to Your F-Body
Is your 1999 Pontiac Firebird or Chevrolet Camaro running rough, stalling, or showing a persistent Check Engine Light? The Powertrain Control Module (PCM) is the brain of your vehicle, managing everything from fuel delivery and spark timing to transmission shifts. When it fails, it can cause a host of frustrating and difficult-to-diagnose problems. This direct-fit 1999 Firebird PCM is the reliable solution you need to get your car back on the road and running smoothly.
As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can mimic other issues, leading to wasted time and money on unnecessary parts. That’s why we take the guesswork out of the repair. This module isn’t just a part; it’s a complete solution. We program it specifically to your vehicle’s VIN using the latest GM software updates before it ever leaves our facility. This ensures perfect communication with your car’s engine, transmission, and security systems, a critical step for proper function.
From the Diagnostic Bay: The Intermittent Stall
A customer brought in his ’99 Camaro 3.8L with a problem that had stumped two other shops: it would randomly stall at traffic lights, but only when warm. There were no consistent trouble codes, just a history of random misfires. We checked fuel pressure, ignition components, and sensors—all tested fine. On a hunch, I monitored the PCM data stream during a long test drive. Just before it stalled, I saw the injector pulse width data go haywire. The thermal stress was causing an internal failure in the PCM. Replacing it with a correctly programmed module solved the problem instantly. This is a classic example of how a failing 1999 Firebird PCM can create phantom issues that are nearly impossible to trace without experience.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty powertrain module could be the culprit. A failing PCM can often trigger diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error).
- ✔ Check Engine Light is on or flashing
- ✔ Vehicle will not start or is difficult to start
- ✔ Rough or unstable idle
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass an emissions test
- ✔ Loss of power or sluggish acceleration
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIY enthusiast. The module is located in the engine bay, making access relatively simple. Follow these steps carefully.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: Open the hood and find the PCM. On these models, it’s mounted behind the right-hand (passenger side) strut tower.
- Disconnect the Harnesses: Carefully unclip and disconnect the electrical wiring harnesses from the old module. The connectors have locking tabs that need to be released.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Seat your new, pre-programmed PCM into the bracket and secure it with the mounting bolts.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You MUST perform the GM VATS (Vehicle Anti-Theft System) relearn procedure. This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle will not start until this is completed.
Verified Vehicle Compatibility
This module is a guaranteed fit for the following vehicles equipped with the 3.8L V6 engine. It is a direct replacement for service numbers 09374997 and 9374997.
- 1999 Pontiac Firebird (3.8L Engine)
- 1999 Chevrolet Camaro (3.8L Engine)
By providing your VIN at checkout, you ensure this 1999 Firebird PCM arrives ready for installation, saving you a trip to the dealership and getting you back to enjoying your drive.
Frequently Asked Questions
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and it will arrive with the latest GM software, matched to your car.
What is the VATS security relearn procedure?
It’s a required process to sync the new PCM with your car’s anti-theft system. After installation, you’ll cycle the ignition key on and off in a specific sequence (usually 3 cycles of 10-15 minutes ‘ON’). The car will not start until this is done. Instructions are widely available online for your specific model.
Where is the PCM located on my 1999 Firebird or Camaro?
The electronic control module is located in the engine compartment, positioned behind the passenger-side (RH) strut tower.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like code P0601), this part will resolve the issue. However, you should always diagnose the codes first to ensure the problem isn’t a faulty sensor or other component.
What information do you need from me?
All we need is your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct, vehicle-specific software and updates onto the module.