Powertrain, generic

P0E83 Auxiliary Cooling System Coolant Temperature Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Sensor signal wire shorted to ground
Internally shorted sensor A
Genuinely very hot coolant in the auxiliary loop

Symptoms

  • Check engine light
  • Coolant pump or fan running continuously
  • Implausibly high temperature shown on a scan tool

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

aux cooling coolant temp sensor awiring harness

Related codes

P0E81P0E82P0E84P2184

References: fordservicecontent.com, law.cornell.edu.