P1183 Possible Causes
- Engine is not at operating temperature.
- Thermostat cooling system problem stuck.
- Faulty Engine Oil Temperature (EOT) sensor
- Engine Oil Temperature (EOT) sensor harness is open or shorted
- Poor electrical connection in the Engine Oil Temperature (EOT) sensor circuit
- Faulty Engine Control Module (ECM).
How to Fix Code P1183?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or engine warning light soon on)
P1183 Meaning
The Engine Oil Temperature (EOT) sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as temperature increases and resistance increases as temperature decreases. The variable resistance affects the voltage drop across the sensor terminals and provides an electrical signal to the Engine Control Module (ECM) corresponding to the temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that the change in the passive sensor’s resistance causes a change in the total current flow.
The voltage that drops across a fixed resistor in series with the sensor resistance determines the voltage signal at the ECM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The EOT sensor measures the engine oil temperature. The sensor is typically screwed into the engine oil lubrication system. The ECM can use the EOT sensor input to determine the following:
– On Variable Camshaft Timing (VCT) applications, the EOT input is used to adjust VCT control gains and camshaft timing logic.
– The ECM can use the EOT sensor input in conjunction with other ECM inputs to determine oil degradation
– The ECM can use the EOT sensor input to trigger an engine gradual shutdown. To prevent engine damage due to high oil temperature, the ECM has the capability to trigger an engine gradual shutdown. Whenever the engine speed exceeds a calibrated level for a certain period, the ECM begins to reduce power by disabling engine cylinders.