Powertrain, generic

P0EA3 DC/DC Converter Current Sensor C Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0EA3 marks a current sensor C signal above the top of its accepted window. Electrically this means the signal line touching a voltage source, an open sensor ground or a failed output stage of the sensor; a genuine overcurrent of the converter is a different matter and has its own code, P0D33. No manufacturer documents P0EA3 publicly. Mercedes-Benz illustrates the fault type on the first current channel of the converter in the EQB and the G-Class, which logs P0E5400 for a short to plus; in that bulletin the entry comes from a wrong wake-up of the converter rather than from damaged wiring; a converter reset ends the error state. Ford treats raw current signals above 6.0 V as faulty. If only sensor C is affected, its path is the suspect. The low fault is P0EA2.

Likely causes

Sensor C signal shorted to supply

Open ground of the current sensor

Converter error state after wake-up

Symptoms

12 V or high-voltage warning in the cluster
Converter output stopped
Reduced performance possible

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€60–2,500

Time0.3–5 h

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

Parts involved

dcdc current sensor cwiring harnessdcdc converter

References: static.nhtsa.gov, fordservicecontent.com, law.cornell.edu.