A bad connection at the sensor; An open in the ground circuit between the; ECT sensor; And the PCM; A short in the voltage feed between the sensor and the PCM; A bad PCM (less likely); A bad temperature sensor (shorted internally)

Read the code and freeze-frame data with an OBD-II scanner; Check the connector and wiring of the part named in the code; Test the part with scanner live data or a multimeter, using the values in the repair manual; Fix the cause, clear the code and test-drive

P0118 on Honda City GM2: Engine Coolant Temperature Sensor Circuit High Input

Short answer: P0118 means “Engine Coolant Temperature Sensor Circuit High Input”. The car’s computer has found a fault in the Engine system and turns on the Check engine light (MIL). First check: read the code and freeze-frame data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P0118
System: Engine
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on

Likely causes

A bad connection at the sensor
An open in the ground circuit between the
ECT sensor
And the PCM
A short in the voltage feed between the sensor and the PCM
A bad PCM (less likely)
A bad temperature sensor (shorted internally)

What to check, in order

Read the code and freeze-frame data with an OBD-II scanner
Check the connector and wiring of the part named in the code
Test the part with scanner live data or a multimeter, using the values in the repair manual
Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0117 P0120 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.