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.
Diagnostic Aids
- If DTCs P0105, P0110, P0115, and P0120 are also set, malfunction may be a faulty sensor ground circuit.
- Check for a faulty electrical connection to PCM.
- Check for proper operation of the engine cooling system and verify correct coolant level.
- Use the Temperature vs. Resistance table to evaluate possibility of a shifted ECT sensor. A shifted sensor could result in a DTC P0115. See TEMPERATURE VS. RESISTANCE table.
An intermittent malfunction may be caused by a fault in ECT sensor electrical circuit. Check wiring harness and components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article. Repair any electrical circuit faults found.
If DTC P0115 cannot be duplicated, information included in freeze frame data can be useful in determining vehicle operating conditions when DTC first set.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.