![]() As you drive the vehicle, compare these values to the Coolant Temperature Sensor PID or parameter ID. When diagnosing a P0117 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive while paying close attention to engine load, throttle position, RPM, and road speed on a data streaming scan tool. P0117 Diagnostic Theory for Shops and Technicians NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smogĬO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas In some cases, the engine may be hard starting and/or get poor fuel economyĬommon Problems That Trigger the P0117 Codeĭefective Engine Coolant Temperature Sensorįaulty or corroded Engine Coolant Temperature wiring or connectionsĮngine Coolant Temperature Sensor is replaced when the real cause is rusty coolantĮngine Coolant Temperature Sensor is replaced when the real cause is a poor connection or chafed wiringĮngine Coolant Temperature Sensor is replaced when the real problem is in the Cooling System In many cases, no abnormal symptoms may be noticed The Engine Coolant Temperature Sensor converts the coolant temperature into a voltage that is high when the engine is cold and low as the engine warms up.Ĭode P0117 indicates a low voltage input from the Coolant Temperature Circuit to the PCM. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, the cooling fans, and many components of the Emissions Control Systems. The Engine Coolant Temperature Sensor measures the rise and fall of the Engine Coolant Temperature. ![]() OBD-II Code P0117 is defined as a Engine Coolant Temperature Circuit Low Input We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0117 code. Our automotive experts have put together the following information about the P0117 diagnostic trouble code.
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