P0EA3: DC/DC Converter Current Sensor C Circuit High

What does P0EA3 mean?

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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

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

Common causes

• High Sensor C signal shorted to supply
• Medium Open ground of the current sensor
• Low Converter error state after wake-up

Likelihood is a general estimate across vehicles; your make and model may differ.