DTC Advanced Diagnostics: P2184, P2185 (2.0L Engine) (2024 2025)
DTC P2184 : Engine Coolant Temperature (ECT) Sensor 2 Circuit Low Voltage DTC P2185 : Engine Coolant Temperature (ECT) Sensor 2 Circuit High Voltage
General Description
The powertrain control module (PCM) monitors engine coolant temperature (ECT) sensor 2 for electrical malfunctions. ECT sensor 2 is a thermistor that detects engine coolant temperature at radiator outlet, which is used in thermal management as engine coolant temperature upstream the engine. The ECT sensor 2 resistance varies depending on temperature. The sensor resistance and the output voltage increase as the engine coolant temperature decreases. The output voltage is continuously monitored against minimum and maximum thresholds. If the ECT sensor 2 output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 0.5 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P2184
The ECT sensor 2 output voltage [ECT Sensor 2 Voltage] is less than 0.11 V for at least 0.5 seconds.
DTC: P2185
The ECT sensor 2 output voltage [ECT Sensor 2 Voltage] is greater than 4.95 V for at least 0.5 seconds.
[ ]: HDS Parameter
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P2184
- ECT sensor 2 TW2 line short to ground
DTC: P2185
- ECT sensor 2 TW2 line short to power
- ECT sensor 2 TW2 line open
- ECT sensor 2 SG13 line open
Common
- ECT sensor 2 failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.