Engine Coolant Temperature (ECT) Sensor GMC Yukon 5.3L 2007-2014 Location and Replacement

Exact Component Location

This video focuses exclusively on showing you the exact, precise location of the Engine Coolant Temperature (ECT) sensor on this vehicle. If you are struggling to find it on the 5.3L V8 engine, look at the front of the driver’s side cylinder head. The sensor is threaded directly into the side of the aluminum cylinder head casting, positioned just below the valve cover, right behind the alternator bracket and slightly above the first exhaust manifold port.

How This Video Helps Your DIY Repair

Locating the sensor quickly is the crucial first step for any successful do-it-yourself project. By seeing the exact spot and identifying how the alternator bracket, ignition coil packs, and main wiring loom line up around the sensor beforehand, you can easily plan your approach, determine if you need a deep socket or an extension to clear the surrounding components, save valuable time, and proceed with confidence knowing you are targeting the correct component from the start.

Symptoms of a Faulty ECT Sensor

A failing engine coolant temperature sensor sends erratic or incorrect temperature data to the engine control module, disrupting both fuel management and dashboard instrumentation. Common symptoms include a Check Engine Light (CEL) with codes like P0117 or P0118, a temperature gauge on the dash that drops to zero or reads erratically, the radiator cooling fans running continuously at maximum speed, difficult or extended engine cranking when cold, and a rich fuel condition that hurts fuel economy.

Safety Measures and Precautions

Before beginning any work on your vehicle, it is essential to prioritize safety. Always wear proper protective gear, including safety glasses and mechanic gloves, to protect your eyes and skin from scalding coolant, sharp engine castings, and road grime. Because this sensor is integrated directly into the engine’s pressurized cooling passages, stay alert, ensure the engine is completely turned off and fully cooled down before unthreading the sensor, and keep a drain pan and clean shop towels ready beneath the area to catch the small amount of engine coolant that will spill out during the swap.

Expert Assistance and Comments

As an experienced mechanic with years of hands-on automotive repair knowledge, I am here to support you. If you have any specific questions about releasing the GM squeeze-style electrical connector, applying thread sealant to the new sensor, bleeding trapped air out of the cooling system afterward, or encounter a problem while working, feel free to drop a message in the comments below, and I will help you with your car repair.