Programmed 2003 Trailblazer EXT PCM 89017750 | GM ECM ECU

Is your GM truck or SUV suffering from mysterious engine problems, erratic transmission shifting, or a frustrating no-start condition? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s performance, reliability, and fuel efficiency. We take the guesswork out of the repair by pre-programming the module specifically to your vehicle’s Vehicle Identification Number (VIN) with the latest GM factory software updates. This ensures a seamless installation and immediate return to factory-spec operation.

Is Your GM Truck or SUV Showing These Symptoms?

A failing PCM can manifest in numerous ways, often leading to confusing diagnostics. If you’re experiencing any of the following issues, a faulty engine computer is a likely cause. This replacement 2003 Trailblazer EXT PCM is designed to resolve these exact problems.

• ✔ Check Engine Light is on with communication-related trouble codes (e.g., U-codes) or multiple random sensor codes.
• ✔ Your vehicle fails to start or starts and then immediately stalls.
• ✔ Harsh, erratic, or delayed automatic transmission shifting.
• ✔ A noticeable drop in fuel economy for no apparent reason.
• ✔ The engine misfires, stumbles, or hesitates during acceleration.
• ✔ Cooling fans run constantly or not at all, leading to overheating.
• ✔ The anti-theft or security light stays illuminated, preventing the engine from starting.

The Brain of Your Operation: Why a Programmed PCM is Crucial

The PCM is the master controller for your vehicle’s powertrain. It processes data from dozens of sensors to manage critical functions like fuel injection timing, ignition spark, transmission shift points, and emissions systems. When it fails, the entire system is compromised. Simply installing a used module from another vehicle won’t work, as it’s programmed for that specific vehicle’s options and security system. Our service eliminates this barrier. By providing us with your VIN, we flash this module with the precise software your vehicle needs. This process ensures all systems communicate correctly, from the engine and transmission to the instrument cluster and anti-lock brakes.

A Direct-Fit Solution for a Wide Range of GM Vehicles

This module, identified by service number 89017750, is a direct replacement for a vast array of popular GM trucks and SUVs from the early to mid-2000s. While this listing is for a 2003 Trailblazer EXT PCM, it is also the correct computer for many Chevrolet Silverado, Tahoe, Suburban, GMC Sierra, Yukon, Cadillac Escalade, and Hummer H2 models. It is cross-compatible with service numbers 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify the part number on your original module or consult the detailed fitment list to confirm compatibility with your specific year, make, and model.