Code Definition

P0116 (22) — Coolant temperature sensor signal error - sensor 1

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 sensor-related fault — the reported value from the named sensor is out of spec.

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 problem with the range or performance of the Engine Coolant Temperature (ECT) sensor circuit. This sensor is essential for monitoring the temperature of the coolant in the engine and provides data to the Engine Control Module (ECM) for managing engine operations like fuel injection and ignition timing. The ECM sets this code when it detects that the readings from the ECT sensor are not within the expected range or the sensor's performance is inconsistent.

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