Code Definition

P1117 — Engine Coolant Sensor intermittent/ECT Sensor Intermittent

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

About P1117

P1117 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 P1117 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.

P1117 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 signal from the Engine Coolant Temperature (ECT) sensor. The ECT sensor provides critical temperature data for engine management, including fuel injection, ignition timing, and cooling system operation. An intermittent signal can cause improper fuel calculations, cooling fan malfunctions, and drivability issues.

Quick Facts