Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
This test monitors ECT sensor after timer reaches 4.25 minutes. The PCM looks at the test condition every second and increments the timer each time test conditions are met. After 4.25 minutes, and if ECT drops to less than 41°F (5°C) for 3 seconds, DTC P0125 will set. If ECT is greater than 41°F (5°C), test will be considered passed regardless of timer. The timer will decrement if PCM is disabling fuel to any cylinder during traction control maneuvers, acceleration reduction, torque management, etc. The timer will reset only when engine stops running.
For duplication of DTC, ensure DTCs P0112, P0113, P0117 or P0118 are not set, engine is running, IAT is at 32°F (0°C) or greater, and vehicle speed is at least 10 MPH.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.