Code Definition

P1114 — ECT Sensor Circuit Intermittent Voltage Low

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

About P1114

P1114 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1114 is stored, the module has detected a signal or supply voltage lower 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.

P1114 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 Isuzu code indicates the Engine Coolant Temperature (ECT) sensor is intermittently reporting a voltage lower than expected. The ECT sensor is a thermistor whose resistance falls as the coolant heats, and the Engine Control Module (ECM) uses its signal to control fuel enrichment, ignition timing, and cooling fan operation. Because the signal voltage drops with resistance, an intermittent low voltage typically reflects a brief short to ground, which the ECM reads as an implausibly hot engine. The sporadic fault can disturb cold start enrichment, fan operation, and driveability, with symptom...

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