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.
DTC P0116: ECT Sensor Circuit Range/Performance Problem
- If DTC P0117 and/or P0118 are stored at the same time as DTC P0116, troubleshoot those DTCs first, then recheck for DTC P0116.
- Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Turn the ignition switch ON (II).
- Check the ECT with a scan tool or the HDS.
Is about 176 °F (80 °C) or more, or 0.86 V or less indicated?
- YES - Go to step 3.
- NO - Go to step 7.
- Note the coolant temperature from step 2.
- Turn the ignition switch OFF.
- Cool the engine for 1 hour.
- Check the ECT with a scan tool or the HDS.
Did the ECT change 3.6 °F (2 °C) or more?
- YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
- NO - Replace the ECT sensor (see SPECIAL TOOLS ).
- Note the coolant temperature from step 2.
- Start the engine. Hold the engine speed at 3,000 RPM without load (in neutral) until the radiator fan comes on, then let it idle.
- Check the ECT with a scan tool or the HDS.
Does the ECT change 3.6 °F (2 °C) or more?
- YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
- NO - Replace the ECT sensor (see SPECIAL TOOLS ).
Use the Manual With the Right Hardware
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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.
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