Code Definition

P0116 — Engine Coolant Temperature Circuit Range / Performance Problem

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0116

P0116 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0116 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0116 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0116 code indicates a range or performance problem with the Engine Coolant Temperature (ECT) sensor circuit. The ECT sensor is a thermistor that reports coolant temperature to the Engine Control Module (ECM), which uses it to manage fuel injection, ignition timing, cooling fans, and closed loop operation. Unlike a simple circuit fault, this code sets when the signal is electrically valid but not rational, for example the coolant temperature does not match intake air temperature after a cold soak, or it warms up too slowly. Symptoms can include hard cold starting, poor fuel economy, a rich...

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