OBD2 Codes

P0117 – Engine Coolant Temperature Sensor Circuit Low Input

Coolant temperature sensor reading too low; check sensor and wiring.

Details

The coolant temperature sensor is reading abnormally low. Check sensor wiring and connections.

Typical causesFaulty coolant temperature sensor damaged wiring poor connection
SymptomsCheck engine light possible overheating gauge reading incorrectly
SeverityMedium — can cause engine damage if overheating
DIY checksCheck sensor wiring connections test sensor resistance
ToolsMultimeter OBD2 scanner

Utilities

Copy-paste helpers

Quick checklist

Check sensor wiring connections test sensor resistance

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P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Engine not reaching proper operating temperature; thermostat likely stuck open.

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FAQ

Common questions

Can I drive with this code?

Not recommended—incorrect temperature readings can lead to engine damage.

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