Restore Peak Performance to Your GM Truck or Van
Is your 1999-2000 GMC Yukon, Chevy Tahoe, or other GM vehicle running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of diagnostic experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can create a host of frustrating and hard-to-diagnose problems. The PCM is the brain of your vehicle’s engine and transmission, and when it starts to fail, it can affect everything from fuel economy to shift quality. This isn’t just an inconvenience; it can be a reliability issue that leaves you stranded.
This replacement PCM is the definitive solution to get your truck back in top form. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door loaded with the latest official GM software updates, ensuring optimal performance and compatibility. You get a reliable, plug-and-play part without the expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in his 2000 Chevy Silverado with the 4.3L V6, complaining of an intermittent no-start and a random stalling issue that no one could solve. The parts cannon had already been fired at it: new fuel pump, crank sensor, and ignition coil. The problem persisted. When I connected my scan tool, I noticed intermittent communication loss with the PCM. This is a classic red flag. On these specific GM trucks, corrosion on the PCM connectors or internal board failure is common. After confirming the wiring harness was sound, we installed a VIN-programmed PCM. The communication dropouts vanished, and the truck started and ran perfectly. It’s a textbook example of how a faulty 1999-2000 Yukon PCM can mimic other component failures, costing you time and money.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module is a likely culprit:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) for internal module failure, such as P0601, P0604, or P0605
- ✔ Unexplained stalling or engine hesitation
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine cranks but refuses to start (no-start condition)
- ✔ Noticeable decrease in fuel economy
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. Here’s a general guide for a GMC Yukon or similar truck:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to discharge completely.
- Locate the PCM: On most trucks like the Yukon, Tahoe, and pickups, the PCM is located in the engine compartment on the driver’s side, sometimes under or near the battery tray. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
- Disconnect Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. Inspect the connectors for any signs of corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. There are typically a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform CASE Relearn (If Necessary): After installation, a Crankshaft Position System Variation (CASE) relearn procedure may be required using a capable scan tool to ensure optimal engine timing and prevent certain trouble codes.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. It is guaranteed to fit the following vehicles (please verify your specific options):
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
Do I need to do any programming after I receive the module?
Do I need to do any programming after I receive the module?
No. This PCM arrives pre-programmed with the latest GM software matched to your vehicle’s VIN. It is ready for installation right out of the box. The only additional step that may be needed is a CASE relearn.
How do I provide my VIN number for programming?
Do I need to do any programming after I receive the module?
No. This PCM arrives pre-programmed with the latest GM software matched to your vehicle’s VIN. It is ready for installation right out of the box. The only additional step that may be needed is a CASE relearn.
What is a CASE Relearn and is it required?
Do I need to do any programming after I receive the module?
No. This PCM arrives pre-programmed with the latest GM software matched to your vehicle’s VIN. It is ready for installation right out of the box. The only additional step that may be needed is a CASE relearn.
Is this a direct replacement for part number 16263494?
Do I need to do any programming after I receive the module?
No. This PCM arrives pre-programmed with the latest GM software matched to your vehicle’s VIN. It is ready for installation right out of the box. The only additional step that may be needed is a CASE relearn.