P0E83Auxiliary Cooling System Coolant Temperature Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0E83 means the signal voltage of temperature sensor A in the auxiliary cooling loop has fallen below its valid floor. Coolant sensors are normally NTC thermistors whose resistance drops as they warm, so a low voltage reads as extremely hot coolant. When the value is beyond anything physically possible, the cause is usually a signal wire touching ground or a shorted sensor rather than real overheating. No manufacturer documents P0E83 publicly. On Ford's 2019 hybrids the equivalent fault of the heater-loop sensor ECT2 is P2184, recorded after 5 seconds of driver fault status. CARB requires out-of-range detection for such temperature inputs. The module may then run pumps or fans on safe defaults. P0E84 is the opposite, a reading stuck cold; P0E82 covers values inside the range that are implausible.
- What you may notice
- Check engine light
- Coolant pump or fan running continuously
- Implausibly high temperature shown on a scan tool
- Likely causes
- LikelySensor signal wire shorted to ground
- PossibleInternally shorted sensor A
- RareGenuinely very hot coolant in the auxiliary loop
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.