Technical Description of OBD-II Trouble Code
Circuit Range/Performance of Engine Coolant Temperature (ECT) Sensor #2
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to all vehicles manufactured from 1996 onwards (Ford, Hyundai, Kia, Mazda, Mercedes-Benz, etc.). Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
The ECT (Engine coolant temperature) sensor is a thermistor that changes its resistance based on the temperature of the coolant in contact with it. The #2 ECT sensor is typically located in the engine block or coolant passage. It is usually a two-wire sensor, with one wire providing a 5 Volt supply from the PCM (Powertrain Control Module) to the ECT, and the other wire serving as a ground for the ECT.
As the temperature of the coolant changes, the resistance on the signal wire also changes accordingly. The PCM monitors this reading to determine the coolant temperature, which is essential for proper engine fuel management. When the engine coolant is low, the sensor’s resistance is high, resulting in a high signal voltage (indicating low temperature) to the PCM. Conversely, when the coolant is warm, the sensor’s resistance is low, and the PCM detects a high temperature. The PCM expects to observe gradual resistance changes on the ECT signal circuit. If it detects a rapid voltage change that is inconsistent with the engine warming up, it will trigger the P2183 code. Alternatively, if it detects a lack of change in the ECT signal, this code may also be set.
Note: This DTC is essentially identical to P0116, but the difference lies in the fact that this code specifically refers to the #2 ECT circuit. Therefore, vehicles displaying this code have two ECT sensors. It is important to ensure that the correct sensor circuit is being diagnosed.
Symptoms
If the problem is very intermittent, there may be no noticeable symptoms. However, the following symptoms may occur:
Causes
Possible causes of the P2183 code include:
An example of an Engine Coolant Temperature (ECT) sensor
Possible Solutions
If there are any other ECT sensor codes present, it is advisable to diagnose them first.
Using a scan tool, check the readings for ECT #1 and #2. On a cold engine, the ECT reading should match the Intake Air Temperature (IAT) reading or be equal to the ambient (outside) temperature reading. If it matches the IAT or ambient temperature, check the freeze frame data on your scan tool (if available). The saved data should indicate the ECT reading at the time of the fault.
a) If the saved information indicates that the engine coolant reading was at the coldest extreme (around -30 deg. F), it is a good indication that the ECT resistance was intermittently high (unless you live in Anchorage!). Check for an open in the ECT sensor ground and signal circuits, and repair them as necessary. If they appear to be in good condition, warm up the engine while monitoring the ECT for any intermittent high or low jumps. If such jumps occur, replace the ECT.
b) If the saved information indicates that the engine coolant reading was at the warmest extreme (around 250+ deg.F), it is a good indication that the ECT resistance was intermittently low. Check for a short to ground in the signal circuit and repair it as necessary. If it appears to be fine, warm up the engine while monitoring the ECT for any intermittent high or low jumps. If such jumps occur, replace the ECT.
Related ECT sensor circuit codes: P0115, P0116, P0117, P0118, P0119, P0125, P0128, P2182, P2184, P2185, P2186
