P0117 2010 Toyota Camry Code - Engine Coolant Temperature Circuit Low Input

Code P0117 indicates that the Engine Control Module (ECM) has detected an unusually low voltage input from the engine coolant temperature (ECT) sensor, suggesting the coolant temperature is below expected values.

Symptoms can include a check engine light, higher or lower than normal engine temperature readings, poor fuel economy, and potential engine overheating.

Common causes include a faulty engine coolant temperature sensor, corroded or damaged sensor wiring, a bad electrical connection at the sensor, or a problem with the engine control module itself.

To fix this code, inspect and replace the engine coolant temperature sensor if defective, repair any damaged wires or connectors, and ensure the coolant level is adequate. Resetting the engine control module after repairs is also necessary.

Driving with the P0117 code can lead to engine damage due to overheating or other related issues. It's advisable to address the problem as soon as possible to avoid potential costly repairs.

Diagnosing this code involves using an OBD-II scanner to confirm the code, visually inspecting the ECT sensor and associated wiring, and checking the coolant level. A multimeter can be used to test the sensor's voltage according to the manufacturer's specifications.

You'll need an OBD-II scanner, a digital multimeter, basic hand tools for removing components if necessary, and possibly a replacement ECT sensor.

The cost can vary but generally includes the price of the sensor (if replacement is needed) which can range from $20 to $50, plus labor which can vary depending on the mechanic's rate and location. Total costs typically range from $100 to $200.

While a bad thermostat itself does not trigger this code, a malfunctioning thermostat that causes the engine to run cooler than normal could indirectly cause the ECT sensor to send a low input signal, potentially leading to this code.