TORQDEX // POWERTRAIN DTC
Engine Coolant Temperature Sensor 1 Circuit High Input
The engine coolant temperature sensor signal is above the expected electrical range.
00 // CODE DEFINITION
What P0118 means
P0118 indicates a coolant-temperature signal voltage above the expected range, often interpreted as an implausibly cold engine.
An open sensor, disconnected connector, broken wire, or poor terminal connection may be responsible.
01 // COMMON SYMPTOMS
What you may notice
02 // COMMON CAUSES
What can trigger P0118?
Open temperature sensor
The sensor may have failed internally.
Disconnected sensor
An unplugged connector can produce a high-voltage signal.
Open circuit
Broken signal or ground wiring can create an implausibly cold reading.
03 // DRIVEABILITY
Can I keep driving with P0118?
The vehicle may remain driveable depending on the symptoms. Diagnose the fault soon, especially if performance, fuel economy, starting, shifting, or engine operation has changed.
04 // DIAGNOSTIC ORDER
Start here
Review live temperature
Look for an unrealistically low coolant-temperature value.
Inspect the connector
Check whether the sensor is unplugged or terminals are damaged.
Check continuity
Verify signal and ground circuits.
Test sensor resistance
Compare the sensor with expected resistance at the measured temperature.
05 // COMMON REPAIR AREAS
Systems commonly involved
These are common areas associated with P0118. Testing should confirm the actual fault before parts are replaced.
Open temperature sensor
The sensor may have failed internally.
Disconnected sensor
An unplugged connector can produce a high-voltage signal.
Open circuit
Broken signal or ground wiring can create an implausibly cold reading.
06 // DIAGNOSTIC PRINCIPLE
Confirm the fault before replacing parts
P0118 identifies a condition detected by the vehicle control system. It does not automatically identify one failed component. Test the affected system before replacing parts.
07 // RELATED TORQDEX DIAGNOSTICS
Related diagnostic guides
Continue troubleshooting by symptom and system. These TorqDex guides cover common diagnostic paths associated with this trouble code.