Restore Your Truck’s Brain and Get Back on the Road
If you’re dealing with frustrating engine problems in your 1999-2000 Chevrolet Tahoe or another compatible GM truck, a failing Powertrain Control Module (PCM) is often the hidden culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cause a cascade of issues that seem impossible to pin down. This isn’t just a replacement part; it’s a reliable, plug-and-play solution designed to restore your vehicle’s performance and dependability. We take the guesswork and hassle out of the repair by programming this module specifically to your vehicle’s VIN with the latest GM software updates before it even leaves our facility.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2000 Tahoe that came into the shop with a problem that had stumped two other mechanics. The owner complained of random stalling at stoplights and a check engine light that would come and go. They had already replaced the fuel pump and cleaned the throttle body, but the issue persisted. After hooking up my scan tool, I noticed intermittent communication loss with the PCM. A quick tap on the module housing while the engine was running caused it to sputter. The internal circuit board had developed micro-fractures from years of heat and vibration. We installed a VIN-programmed 1999-2000 Tahoe PCM, and the truck ran perfectly. It’s a classic failure mode for these units, and this module is the definitive fix.
Is Your Truck Showing These Signs of a Bad PCM?
A failing engine computer can manifest in many ways. If you’re experiencing any of the following, it might be time for a replacement. Catching it early can prevent further damage to other components like your catalytic converter.
- âś” Check Engine Light is illuminated with codes like P0601, P0602, or P0605 (Internal Control Module Memory Errors).
- âś” The engine cranks but refuses to start.
- âś” Unexplained stalling or rough idling.
- âś” A noticeable drop in fuel economy.
- âś” Harsh or erratic transmission shifting.
- âś” Failure to pass an emissions inspection.
- âś” Communication errors with diagnostic scan tools.
Your Straightforward PCM Installation Guide
One of the best features of this module is its ease of installation. Because we program it for you, you won’t need a trip to the dealership. This is a job most DIYers can handle in their own driveway with basic tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait about 10 minutes to ensure the system is fully discharged.
- Locate the PCM: On most 1999-2000 Tahoes and similar trucks, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. Inspect the pins for any corrosion or damage before proceeding.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module. Reconnect your negative battery terminal. A security relearn procedure may be required, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Fitment For These GM Vehicles
This module, part number 16265035, is a direct replacement for a wide range of GM trucks and vans. It is compatible with part numbers 16263494, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on the list below. Providing your VIN at checkout is essential for us to ensure perfect compatibility and programming.
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
EXPRESS 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
EXPRESS 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
ASTRO 00-01 Electronic Control Module; (LH front by battery), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
SAVANA 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
ASTRO 99 Electronic Control Module; (LH front by battery), (4.3L), ID 16263494
ISUZU HOMBRE 99-00 Electronic Control Module; (RH front engine compartment), 4.3L (6 cylinder)
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SAVANA 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/build date opt ZN4
YUKON 00 Electronic Control Module; (LH front under battery), Denali
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/build date opt ZN4
CHEVROLET 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ENVOY 99-00 Electronic Control Module; (RH front engine compartment)
EXPRESS 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/extended build date opt ZN4
SIERRA 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SAVANA 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SUBURBAN 1500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
EXPRESS 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SUBURBAN 2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SAVANA 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BRAVADA 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you before we ship the part. All we need is your vehicle’s 17-digit VIN during checkout. It will arrive ready to install.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Will this fix my check engine light?
If the check engine light is on due to a faulty PCM (common codes include P0601-P0606), then yes, this module will resolve the issue. However, you should always ensure a proper diagnosis has been performed, as other failing sensors can also trigger the light.
Is this a difficult part to replace?
For most DIYers with basic hand tools, this is a straightforward repair that can take less than an hour. Since no programming is required on your end, it’s a simple swap of the old module for the new one.
What if I have an aftermarket alarm or remote start?
The programming we provide restores the factory settings. Some aftermarket systems, especially those with anti-theft functions, may need to be reintegrated or reset by the original installer after the new PCM is in place.