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.

2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

DTC P0116 Engine Coolant Temperature Circuit Range/Performance Problem: Description

Refer to DTC P0115 (See .

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0116	When either of following conditions met (2 trip detection logic) When cold engine started and engine warmed up, Engine Coolant Temperature (ECT) sensor value does not change After warmed up engine stopped and then next cold engine start performed, ECT sensor value does not change	Thermostat Engine Coolant Temperature (ECT) sensor

Factory Service Tools

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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.