Restore Peak Performance to Your GM Truck or SUV
Is your 1999-2000 Cadillac Escalade, Tahoe, or Suburban suffering from baffling issues like intermittent stalling, a persistent check engine light, or a complete no-start condition? As a technician with over two decades of experience, I’ve seen these symptoms hundreds of times. The culprit is often a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This isn’t just a part; it’s the command center for your engine and transmission. When it falters, your vehicle’s reliability and performance suffer dramatically.
This replacement PCM is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically to your vehicle’s VIN before we ship it. This means it arrives loaded with the latest GM software updates, ready for a straightforward installation. You get a reliable fix that restores factory performance without the need for expensive dealership programming tools.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2000 Yukon Denali that came into my shop on a tow truck. The owner was frustrated; he’d replaced the fuel pump and crank sensor at another shop, but it still had an intermittent no-start problem. It would run fine for days, then refuse to start for an hour. There were no consistent codes, just a generic communication error that would pop up and disappear. After checking the wiring harness for the fifth time, I focused on the PCM. On these GMT400/800 platforms, the PCM is often under the battery or on the fender, exposed to heat and vibration. Over 150,000 miles, the internal solder joints can crack. We swapped in a pre-programmed PCM, performed the security relearn, and the problem was gone for good. It wasn’t a ghost; it was a failing computer, and this is the exact fix that vehicle needed.
Is Your GM Vehicle Showing These Signs?
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when coming to a stop or at idle.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ The anti-theft or security light stays on, preventing the engine from running.
- ✔ Failure to pass an emissions test due to module communication issues.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the PCM: On most compatible vehicles like the Escalade, Tahoe, or Silverado, the PCM is located in the engine compartment, typically on the driver’s side fender, under the battery tray, or near the firewall.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- ✔ Reconnect the Battery: Reattach the negative battery terminal and tighten it.
- ✔ Perform Security Relearn: This is a critical final step for most GM vehicles of this era. Turn the key to the ‘ON’ position (don’t start the engine) for 10-15 minutes, or until the security light goes out. Turn the key off for 10 seconds, then repeat the process two more times. After the third cycle, the vehicle should start and run normally. This syncs the new PCM with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit the following models, but please verify your part number or contact us with your VIN to ensure a perfect match.
ESCALADE 99-00
Chevrolet / GMC Trucks:
CHEVROLET/GMC 1500 PICKUP 99 (5.0L, 5.7L)
CHEVROLET/GMC 2500 PICKUP 99-00 (Gasoline)
CHEVROLET/GMC 3500 PICKUP 99-00 (Gasoline)
SIERRA/SILVERADO 1500 PICKUP 99-00 (4.3L V6)
S10/S15/SONOMA 98-00 (4.3L V6)
TAHOE/YUKON 99-00 (incl. Denali)
SUBURBAN 1500/2500 99 (Gasoline)
Chevrolet / GMC SUVs & Vans:
ASTRO/SAFARI 99-01 (4.3L)
BLAZER/JIMMY S-Series 98-00
BRAVADA 98-00
ENVOY 98-00
EXPRESS/SAVANA 1500 VAN 99-02
EXPRESS/SAVANA 2500 VAN 99-02 (Gasoline)
EXPRESS/SAVANA 3500 VAN 99-02 (Gasoline)
Isuzu:
ISUZU HOMBRE 98-00 (4.3L V6)
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information, as it is required for the programming service.
Do I need to do anything after installing this PCM?
Yes, you will need to perform the vehicle’s security relearn procedure, also known as the Passlock or VATS relearn. Our installation guide provides a general overview of this simple, no-tools-required process.
What causes a PCM to fail on these trucks?
The most common causes of failure are age, heat cycles, and vibration. Over many years, these factors can cause microscopic cracks in the internal solder joints and circuit boards, leading to intermittent or total failure.
Is this part difficult to replace for a DIYer?
No, this is a great job for a DIY enthusiast. The module is typically easy to access, and the replacement involves simple hand tools. The key is our pre-programming service, which eliminates the most difficult part of the job.
Will this fix my specific problem?
This module will correct any issues directly caused by a faulty PCM. If you’re experiencing symptoms like a no-start condition, erratic shifting, or specific internal module error codes (like P0601), this is very likely the solution. However, always ensure your vehicle’s other systems (like fuel and ignition) have been properly diagnosed.