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P0117

Overview

Code

P0117

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0117 indicates that the engine coolant temperature sensor signal is lower than the expected value detected by the ECM

Symptoms

Check Engine Light illuminated; Poor cold start performance; Cooling fan running continuously

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

Low ECT input can cause incorrect fuel delivery and cooling fan operation

Possible Causes

Faulty ECT sensor; Short to ground in wiring; Poor electrical connection

Diagnostic Steps

1 Confirm code P0117; 2 Inspect wiring for shorts; 3 Monitor live ECT voltage and temperature data; 4 Compare readings to actual coolant temperature; 5 Replace the ECT sensor if necessary

Drive Safety Notes

Driving is possible, but engine may not operate efficiently Repair is recommended soon

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