Walker Engine Coolant Temperature Sensor 2003 Ram 5.9L Cummins

Need to fix inaccurate temp readings, poor cold starts, or a lingering check engine light on your 5.9L Cummins? The Walker Engine Coolant Temperature (ECT) Sensor is a direct-fit replacement designed to restore accurate coolant temperature sensor data when your factory unit starts to fail or drift out of spec. When the ECT sensor sends incorrect readings, it can throw off fuel delivery, timing, and cooling system operation, leading to rough starts, poor fuel economy, or overheating concerns. This sensor restores that critical signal so your ECU can properly manage engine performance and keep everything running smoothly and consistently.

Built to OE fit, form, and function standards, the Walker ECT sensor uses high-quality thermistor-based internal components designed to deliver precise temperature readings under constant heat cycling and engine load. The housing is engineered to withstand moisture, corrosion, and long-term exposure to coolant conditions that commonly cause sensor failure. Each unit is fully tested to OE specifications to ensure accurate signal output and reliable ECU communication, giving you dependable temperature control, consistent drivability, and long-term durability.