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P0116

Overview

Code

P0116

Code Type

P

Code Class

P0

System

Engine

Severity Level

Low

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0116 indicates that the engine coolant temperature sensor signal is outside the expected range or performance limits

Symptoms

Check Engine Light illuminated; Poor engine warm-up performance; Reduced fuel efficiency

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Incorrect coolant temperature data affects fuel mixture, ignition timing, and emissions control

Possible Causes

Faulty ECT sensor; Wiring or connector issues; Cooling system problems

Diagnostic Steps

1 Confirm the fault code; 2 Monitor coolant temperature data during warm-up; 3 Inspect wiring and connectors; 4 Compare readings to actual engine temperature; 5 Replace the ECT sensor if data is inaccurate

Drive Safety Notes

Vehicle operation is usually possible, but prolonged driving may affect emissions and fuel efficiency

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