Cobb Accessport for 4Runner (2025+)

The Accessport from COBB Tuning is the world’s best-selling, most flexible, and easiest-to-use ECU upgrade solution for Toyota vehicles. It unlocks hidden performance by replacing conservative factory calibrations with more aggressive, refined tuning. Follow a staged upgrade path using pre-loaded Off The Shelf (OTS) maps or work with a professional tuner for fully custom calibrations at any modification level. Designed for power, drivability, and control, this is the last engine management solution you’ll ever need.

This version of the Accessport also includes the ability to flash the TCM (Transmission Control Module), allowing you to fine-tune automatic transmission behavior for a driving experience that matches your style.

Important notes

• ECU and TCM flashing: Supports engine and automatic transmission tuning
• Transmission tuning included: OTS TCM maps adjust shift points, firmness, skip-shift behavior, and torque limits
• Gateway bypass harness included: Required for initial installation, unsupported ROM reads, or flash recovery
• Harness usage limitation: Not required for map changes or uninstalling the Accessport
• Software warning: Installing over non-OEM or non-COBB software may result in ECU or TCU failure
• Emissions compliance: 50-state legal with CARB Executive Order D-660-277

Features

• Vehicle compatibility: Designed specifically for the 2025 Toyota 4Runner
• ECU tuning: Unlocks additional horsepower and torque with refined engine calibrations
• TCM tuning: Improves shift behavior, throttle response, and torque management
• Large color display: High-resolution, full-color screen for clear data visibility
• Multi-gauge monitoring: Displays up to six live parameters in real time
• Customizable layout: Configure race, street, or dyno-style gauge clusters
• In-cabin mounting: Includes mount with on/off switch for daily use
• Data logging: Records multiple channels simultaneously for in-depth analysis
• Map storage: Holds up to 100 ECU and TCM calibrations
• Map switching: Quickly change maps for performance, towing, or daily driving
• Accesstuner support: Compatible with Accesstuner software for custom tuning (sold separately)
• Interchangeable faceplates: Customize the look with optional bezel colors

Gateway bypass harness overview

The included Gateway Bypass Harness connects to the vehicle’s OBD-II port, gateway connector, and the Accessport. It enables ECU communication in scenarios where flashing would otherwise be blocked, such as first-time installation, unsupported ROM extraction, or recovery from a failed flash. Installation instructions are provided by COBB.

Emissions compliance

• CARB EO number: D-660-277
• Legal status: Approved for use on emissions-controlled vehicles in all 50 states when installed per application guidelines

ECU map options

• Stage 0: Factory-equivalent calibration
• Stage 1 (87/91/93 octane): Increased power and improved throttle response
• Performance tow: Optimized calibration for towing and load management

TCM map options

• Simulated stock: Factory-style transmission behavior
• COBB OEM+: Sporty yet refined shift points with moderate torque increases
• COBB sport: Performance-focused calibration with aggressive shift points and torque limits

What’s included

• Accessport V3 handheld tuner
• Gateway Bypass Harness
• In-cabin mounting hardware
• OBD-II cable
• Installation instructions