Code Definition

P1115 — Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input

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

About P1115

P1115 is a manufacturer-specific powertrain diagnostic trouble code. 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

This fault code is set when the Powertrain Control Module (PCM) detects an intermittent high voltage signal from the Engine Coolant Temperature (ECT) sensor or a high input from the secondary Intake Air Temperature (IAT-B) sensor. These sensors provide critical data for fuel injection, ignition timing, and cooling system operation. A high voltage reading often indicates an open circuit or a faulty sensor.

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