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P0639

Overview

Code

P0639

Code Type

P

Code Class

P0

System

Engine

Severity Level

High

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0639 indicates a malfunction in the engine coolant temperature sensor circuit

Symptoms

Engine overheating; Poor fuel economy

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

Engine coolant temperature sensor

Possible Causes

Faulty coolant temperature sensor; Wiring issues

Diagnostic Steps

1 Inspect coolant temperature sensor 2 Test sensor output

Drive Safety Notes

Engine overheating can lead to severe damage

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