Powertrain, generic

P0E82 Auxiliary Cooling System Coolant Temperature Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0E82 is set when temperature sensor A of the auxiliary cooling loop delivers a clean electrical signal whose value does not make sense against other temperatures. No manufacturer documents P0E82 publicly, but Ford's 2019 hybrid summary spells out such a plausibility test for its heater-loop sensor ECT2 under P2183. After at least 360 minutes of soak both coolant sensors must agree within 30 °F; with the loops joined and the electric pump above 2,500 rpm for 90 seconds, ECT2 plus a 7 °F hose loss must stay within 30 °F of the engine sensor; and the reading must stay between −30 and 275 °F. CARB includes hybrid component temperature sensors in its rationality requirements. A sensor that drifts, or a stuck bypass valve that keeps the loops apart, can trip it. Pure circuit faults are P0E81, P0E83 and P0E84.

Likely causes

Sensor A reading drifted out of tolerance
Stuck bypass valve keeping the loops from mixing
Low coolant or air around the sensor tip
Corroded terminals shifting the signal

Symptoms

  • Check engine light
  • Cabin heat regulation off target

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–400
Time0.3–2 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

P0E81P0E83P0E84P2183P0E7F

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