P2184 Engine Coolant Temperature Sensor 2 Circuit Low
OBD-II Trouble Code Technical Description
Engine Coolant Temperature (ECT) Sensor #2 Circuit Low Input
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to all 1996-newer vehicles (Honda, Toyota, Volkswagen VW, Mazda, Dodge, Ford, BW, etc.). Although generic, the specific repair steps may vary depending on make/model.
The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it’s in contact with. It’s usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM.
As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P2184 code will set.
An example of an Engine Coolant Temperature ECT sensor
Note: This DTC is basically identical to P0117, however the difference with this code is that this refers to the #2 ECT sensor circuit. So vehicles exhibiting this code means they have two ECT sensors. Be sure you are diagnosing the correct sensor circuit.
Symptoms
Potential symptoms include:
Causes
Potential causes of the P2184 code include:
Possible Solutions
Since this code is for an abnormally low signal to the PCM from the #2 ECT sensor, the PCM saw a excessively "hot" condition in the engine coolant. This could be due to faulty ECT sensor or wiring, but it could, conceivably, be caused by an overheated engine. So if your engine was overheated diagnose that first. Having said that here are the possible solutions:
Using a scan tool, with KOEO (Key on engine off) check the #2 ECT sensor reading on the display. On a cold engine the ECT reading should match the IAT (Intake Air Temperature) sensor reading. If it doesn’t, replace the #2 ECT sensor.
1. If the ECT reading is showing an excessively hot reading, for example more than 260 deg. F, then unplug the ECT sensor. This should cause the ECT reading to drop to the extreme cold reading (around -30 deg.F or so). If it does, replace the sensor, because it’s internally shorted. If it doesn’t change the reading, the check for a short to ground on the signal circuit of the ECT wiring. It could be that the two ECT wires are shorted to each other. Look for any chafing or melted wiring. Repair as necessary.
a. If you can’t find any wiring problems and the ECT reading doesn’t drop to the extreme coldest when unplugged, then, check for voltage coming out of the PCM on the signal wire’s pin at the PCM connector. If there isn’t any voltage, or it is low, then the PCM may be bad. NOTE: On some models it is possible for the 5 Volt reference signal to be temporarily shorted. This can happen if an engine sensor internally shorts the 5 Volt reference. Since the 5 Volt reference is a "shared" circuit on many models, this will cause it to be abnormally low. Usually, though this will be accompanied by several other sensor codes. If you suspect that may be the case, unplug each sensor until the 5 Volt reference reappears. The last sensor unplugged is the offending sensor. Replace and recheck the signal wire from the PCM connector
2. If the scan tool ECT reading seems normal at this time then the problem may be intermittent. Use a "wiggle" test to manipulate the wiring harness and connectors while watching the ECT reading on the scan tool. Repair any wiring or connectors that are loose or corroded. You could check the Freeze frame data if your scan tool has that function. It will show the ECT reading when the failure occurred. If it shows the reading to be at the hottest extreme then replace the ECT sensor and see if the code reappears.
Related ECT sensor circuit codes: P0115, P0116, P0117, P0118, P0119, P0125, P0128, P2182, P2183, P2185, P2186
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"Delete Error Code Permanently, Disable DTC Error Code Function for p2184 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p2184 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p2184.
