Is your Duramax running rough, losing power, or showing poor fuel economy? The Walker Air Charge Temperature (ACT) Sensor is designed to restore the accurate intake air data your engine needs to perform at its best. This sensor measures the temperature and density of the air entering your engine and sends that information to the ECM, allowing it to fine-tune fuel delivery and timing. When it fails, your truck can exhibit hesitation, a rough idle, reduced efficiency, or even stalling. Replacing it with this direct-fit solution brings back smooth drivability, consistent power, and reliable performance, whether you're towing, daily driving, or working your truck hard.

Built for durability in harsh engine environments, this Walker product is manufactured from high-quality, heat-resistant materials that withstand extreme temperature changes, vibration, and contamination from oil and debris. Its rugged construction ensures accurate signal output even under demanding conditions, while OE-level engineering guarantees a precise fit and reliable operation. Each sensor is 100% tested for performance and longevity, delivering a dependable replacement that maintains consistent readings and long-lasting reliability in diesel applications.