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P0115

Overview

Code

P0115

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 P0115 indicates a malfunction in the engine coolant temperature (ECT) sensor circuit detected by the ECM

Symptoms

Check Engine Light illuminated; Hard starting; Poor fuel economy; Cooling fan running constantly

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

The ECT sensor provides critical temperature data used for fuel delivery, ignition timing, and cooling fan operation

Possible Causes

Faulty ECT sensor; Damaged wiring or connectors; Poor electrical ground; ECM fault (rare)

Diagnostic Steps

1 Scan and confirm code P0115; 2 Inspect ECT sensor wiring and connectors; 3 Monitor live coolant temperature data; 4 Compare readings to engine temperature; 5 Replace the ECT sensor if readings are incorrect

Drive Safety Notes

Driving is possible, but incorrect temperature data may cause overheating or poor engine operation Diagnosis is recommended promptly

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