Restore Your Truck’s Performance and Reliability
Is your 1999-2000 Silverado 1500 acting up? If you’re dealing with frustrating issues like stalling, erratic shifting, a persistent Check Engine Light, or a no-start condition that has you stumped, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a cascade of problems that are impossible to ignore. This isn’t just an inconvenience; it affects your truck’s dependability and your peace of mind.
We offer a straightforward, reliable solution. This is a direct-replacement PCM, part number 19109040, that arrives at your door pre-programmed with the latest GM software updates specifically for your vehicle. All we need is your truck’s Vehicle Identification Number (VIN) at checkout. This critical step ensures that when you receive the module, it’s ready for installation, saving you a costly trip to the dealership and hours of diagnostic headaches. Get your truck running the way it was meant to with a properly functioning 1999-2000 Silverado 1500 PCM.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2000 Sierra 1500 (which uses the same PCM) that came into my shop on a tow truck. The owner was at his wit’s end. He’d replaced the fuel pump, crank sensor, and even the ignition switch, but the truck would still randomly die while driving and then refuse to start for an hour. A scan tool showed a dozen intermittent, unrelated codes. Instead of chasing ghosts, I hooked up my scope and monitored the 5-volt reference signal from the PCM. Sure enough, after about 20 minutes of idling, the voltage would flutter and then drop to zero, killing the engine. This internal PCM failure is a classic symptom on these GMT800 trucks. A new, correctly programmed PCM fixed it instantly. The owner was thrilled to have his reliable workhorse back.
Is Your Truck Showing These Symptoms?
A failing engine computer can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your PCM is the root cause.
- ✔ Check Engine Light is on with internal processor fault codes like P0601, P0602, or P0606.
- ✔ Unexplained stalling or engine shutting off while driving.
- ✔ The engine cranks but will not start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Reduced fuel economy and poor engine performance.
- ✔ Communication errors with scan tools (U-codes).
- ✔ Multiple, unrelated sensor codes appearing simultaneously.
A Straightforward Guide to Installation
Replacing the 1999-2000 Silverado 1500 PCM is a job most DIYers can handle in their own driveway. The module is typically located under the hood on the driver’s side, below the battery tray.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Access the PCM: You may need to remove the battery and the battery tray to gain clear access to the old PCM. This is usually held in by a few bolts.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors from the old PCM. There are typically two or three large connectors with locking levers or tabs. Be gentle to avoid damaging the pins or clips.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reassemble: Reinstall the battery tray and the battery, then reconnect the negative battery terminal.
- Perform Security Relearn: This is a critical final step. The GM PassLock security system needs to relearn the new PCM. The procedure is simple: Turn the key to the ‘ON’ position (don’t start the engine) for 10-15 minutes, or until the ‘Security’ light on the dash stops flashing and turns off. Turn the key ‘OFF’ for 10 seconds. Repeat this cycle two more times (for a total of three 10-minute cycles). After the third cycle, the vehicle should start and run normally.
Will This Fit My Vehicle?
This PCM is a guaranteed fit for the following GM vehicles. It is a direct replacement for part numbers 19109040, 09354896, and 9354896. Please verify your vehicle and options below.
CAMARO 99-02 (5.7L)
CORVETTE 99-00
SILVERADO 1500 PICKUP 99-00 (8 cylinder)
SILVERADO 2500 PICKUP 99-00
SUBURBAN 1500/2500 00
TAHOE 00 (Silverado Style)
GMC:
SIERRA 1500 PICKUP 99-00 (8 cylinder)
SIERRA 2500 PICKUP 99-00
YUKON 00 (exc. Denali)
YUKON XL 1500/2500 00
Pontiac:
FIREBIRD 99-02 (5.7L)
Frequently Asked Questions About This 1999-2000 Silverado 1500 PCM
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and it will arrive ready for installation and the security relearn procedure.
What is the ‘security relearn’ and is it difficult?
The security relearn (or PassLock relearn) syncs the new PCM to your vehicle’s anti-theft system. It’s very simple and requires no tools. Just follow the 3-cycle key-on/key-off procedure outlined in the installation guide above. It takes about 30 minutes to complete.
Where is the PCM located on my 1999 Silverado?
On most 1999-2000 Silverado and Sierra trucks, the PCM is located under the hood on the driver’s side, mounted in a bracket beneath the battery tray.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine functions and transmission shift points. If the module is failing, it can cause harsh, delayed, or erratic shifting. Replacing a faulty PCM often resolves these types of transmission complaints.
Is this part compatible with other part numbers?
Yes, this module, 19109040, is a direct, interchangeable replacement for GM part numbers 09354896 and 9354896.