Turbocharger Actuator Assembly for 2020-2025 Chevy GMC L5P 6.6L Diesel 12691238

Turbocharger Actuator Assembly for Chevy GMC L5P 6.6L Diesel

This turbocharger actuator assembly 12691238 controls the variable geometry vanes on the L5P 6.6L Duramax turbo, regulating boost pressure so the engine delivers steady power under load and cleaner response off the line.

Overview

This turbocharger actuator assembly is the electronic control unit that moves the vanes inside the turbocharger on 2020-2025 Chevy and GMC trucks with the L5P 6.6L diesel engine. It translates ECM commands into precise vane movement, holding the turbocharger at the boost level the engine demands through every driving condition. A direct fit for drivers replacing a failed or sticking unit on the L5P turbocharger.

Built For Performance

• Electronic actuator designed to move variable geometry vanes through their full travel range
• OEM cross-reference 12691238 for straightforward part matching
• Sealed housing built to resist heat and oil exposure in the turbocharger environment
• Plug-in electrical connection for the factory harness and ECM signal
• Calibrated to deliver consistent boost control instead of the limp behavior of a failed actuator

Fits These Machines

• for Chevy Silverado 2500HD with L5P 6.6L diesel, 2020-2025
• for Chevy Silverado 3500HD with L5P 6.6L diesel, 2020-2025
• for GMC Sierra 2500HD with L5P 6.6L diesel, 2020-2025
• for GMC Sierra 3500HD with L5P 6.6L diesel, 2020-2025

On-The-Job Use

• Restoring boost control on a truck that has dropped into reduced power mode
• Replacing a sticking or electrically failed actuator on the L5P turbocharger
• Routine turbo service on work trucks and tow rigs that see heavy load duty
• Shop repair where a factory-fit replacement actuator is needed quickly

Specs At A Glance

Good To Know

Q: Will this actuator need programming after installation? A: Most L5P applications require a relearn or calibration through a scan tool after the actuator is installed. Confirm the procedure for your model year before the job.

Q: How do I know the actuator is the problem rather than the turbocharger? A: A failed actuator typically sets a boost control code and leaves the truck in reduced power while the turbo spins freely. Check codes and vane movement before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.