Powertrain, generic

P0E52 DC/DC Converter Current Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0E52 is the plausibility test of current sensor A: the signal is electrically valid, yet the measured current does not fit what the converter is doing. Two makers name it. FCA lists it for the 2021 Ram 1500 with the 3.6 litre eTorque mild hybrid; bulletin 08-037-21 brings new HCP software and turns P0E52 from a two-trip into a one-trip code, so the MIL may light after a single faulty drive. Ford reports it from the inverter system controller of the 2024–2026 Lincoln Nautilus and the 2025–2026 Maverick hybrid, together with several motor and inverter codes; the car loses power and shows Stop Safely Now or Service Vehicle Soon, and the special service message tells dealers to replace that controller. Pure circuit faults are P0E51, P0E53 and P0E54.

Likely causes

Control software with unsuitable limits (FCA eTorque HCP update)
Internal fault of the inverter system controller (Ford hybrid)
Current sensor drifting or offset out of tolerance
High resistance at sensor connector or ground

Symptoms

  • MIL on, often after only one drive
  • Limited power with Stop Safely Now or Service Vehicle Soon message
  • Reduced eTorque assist or start/stop function

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–3,000
Time0.3–5 h

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

Parts involved

dcdc current sensor awiring harnessdcdc converter

Related codes

P0E51P0E53P0E54P0E55P0E9C

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