Restore Peak Performance to Your GM Truck or SUV
Is your trusty Yukon, Tahoe, or Suburban suddenly acting up? A faulty Powertrain Control Module (PCM) can be the hidden culprit behind a host of frustrating issues, from a persistent check engine light to rough idling and poor fuel economy. It’s the brain of your vehicle, and when it’s not functioning correctly, the entire system suffers. This module, part number 09355699, is the definitive solution to get your vehicle back to running the way it was meant to—smoothly, reliably, and efficiently. We take the guesswork out of the repair by pre-programming it with the latest GM software updates, tailored specifically to your vehicle’s VIN. Regain that worry-free drive and the confidence that your truck will start and perform every single time.
Warning Signs and How to Overcome Them
If you’re noticing any of the following symptoms, a failing PCM could be the cause. Replacing it with our correctly programmed unit can resolve these problems and restore your vehicle’s health.
- ✔ Persistent Check Engine Light: Often with DTCs like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error).
- ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in a gear.
- ✔ Engine Performance Problems: Stalling, hesitation, rough idle, or a sudden drop in fuel mileage.
- ✔ Intermittent or Complete No-Start Condition: The engine cranks but refuses to fire up.
- ✔ Communication Issues: Your scan tool can’t communicate with the module.
Guided Installation to Restore Peace of Mind
Installing your new PCM is a straightforward process that a confident DIYer can handle. Follow these steps to get back on the road quickly. Remember, the final step is crucial for the vehicle to start.
- Safety First: Begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most of these trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side near the battery or firewall.
- Disconnect Harnesses: Carefully unplug the electrical connectors from the old module. There are usually retaining clips that need to be released. Avoid forcing them.
- Remove the Old PCM: Unbolt the old module from its mounting bracket and remove it from the vehicle.
- Install the New Unit: Mount your new, pre-programmed PCM in the same location and secure it with the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely in place. Reconnect the negative battery terminal.
- Perform Security Relearn (CRITICAL STEP): Your vehicle will NOT start until you complete the security relearn procedure. Attempt to start the engine; it will crank but not run. Leave the key in the ‘ON’ position for 10-12 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). The vehicle should now start.
Expert Tip: Don’t Skip the Security Relearn!
Many people install their new PCM and panic when the truck won’t start. This is normal! The GM Passlock/VATS security system needs to sync with the new module. The 30-minute relearn procedure described in the final installation step is not optional—it’s a required handshake between the new ‘brain’ and your vehicle’s anti-theft system. Patience here is the key to a successful repair.
Tailored Fit for Your Ride: A Programmed 1999 Yukon PCM
This module is a direct-fit replacement for a wide range of GM vehicles. To ensure perfect compatibility, we program it using the VIN you provide after purchase. This module is compatible with part numbers 16250279, 09366810, and 09355699 and fits the following models:
- Cadillac Escalade: 1999
- Chevrolet Trucks (1500, 2500, 3500): 1998-1999
- Chevrolet Vans (Astro, Express 1500/2500/3500): 1998-1999
- Chevrolet SUVs (Blazer S10, Suburban, Tahoe): 1998-1999
- GMC Trucks (1500, 2500, 3500, Sonoma): 1998-1999
- GMC Vans (Safari, Savana 1500/2500/3500): 1998-1999
- GMC SUVs (Envoy, Jimmy S15, Yukon): 1998-1999
- Oldsmobile Bravada: 1998
- Isuzu Hombre: 1998
Please verify your vehicle’s specific engine and options against the fitment data. If you have any questions, we’re here to help.
Frequently Asked Questions
What exactly does a PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls critical functions of the engine and transmission, such as fuel mixture, ignition timing, and transmission shift points, to ensure optimal performance, fuel economy, and emissions.
Is this module difficult to install myself?
The physical installation is quite simple, requiring only basic hand tools. The most important part is the security relearn procedure, which requires patience but no special tools. Our instructions walk you through the entire process.
How do I provide my VIN for programming?
After you complete your purchase, we will send you a message requesting your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids. If the module’s internal drivers have failed, it can cause erratic and harsh shifting. A new, correctly programmed PCM will restore proper communication and function.
What happens if I don’t do the security relearn?
Your vehicle’s anti-theft system will not recognize the new PCM, and it will disable the fuel injectors as a security measure. The engine will crank but will not start and run until the 30-minute relearn procedure is successfully completed.