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P0125

Overview

Code

P0125

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 P0125 indicates insufficient engine coolant temperature for closed-loop fuel control operation

Symptoms

Check Engine Light illuminated; Poor fuel economy; Extended engine warm-up time

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

Closed-loop fuel control and emissions monitoring depend on proper engine warm-up

Possible Causes

Faulty thermostat stuck open; Low coolant level; Faulty ECT sensor

Diagnostic Steps

1 Confirm the fault code; 2 Monitor coolant temperature during warm-up; 3 Inspect thermostat operation; 4 Check coolant level; 5 Replace faulty components as needed

Drive Safety Notes

Driving is possible, but fuel efficiency and emissions performance will be affected

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