Code Definition

P1115 — Engine Coolant Temperature Sensor intermittent voltage high

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Honda

About P1115

P1115 is a manufacturer-specific powertrain diagnostic trouble code recorded for Honda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1115 is stored, the module has detected a signal or supply voltage higher than the expected operating range; and 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.

P1115 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Coolant Temperature (ECT) sensor is a negative temperature coefficient thermistor that reports coolant temperature to the Engine Control Module (ECM) for fuel enrichment, ignition timing, cooling fan control, and closed loop fuel feedback. The ECM feeds the sensor a reference voltage through an internal pull up resistor, so the signal voltage rises as the coolant gets colder and the sensor resistance increases. DTC P1115 sets when the ECM sees the ECT signal voltage momentarily climb above the expected range, which corresponds to an implausibly cold reading and points to an intermit...

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