Powertrain, generic

P0E9C DC/DC Converter Current Sensor B Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0E9C means current sensor B of a DC/DC converter gives a value within its electrical window that does not match the operating state, for example a current that stays put while the load changes, or that differs from the figure the controller derives from voltages and switching. No manufacturer documents P0E9C publicly. Ford describes such a rationality test for the boost converter of its hybrids under P0A94: a gap above 50 A between calculated and measured inductor current, lasting over 4 s in controlled operation, flags the converter. FCA treats the equivalent sensor A code P0E52 on the Ram 1500 eTorque as a one-trip fault after a software update. Circuit faults of sensor B are P0E9B, P0E9D and P0E9E.

Likely causes

Current sensor B drifting or with a shifted zero point
Fault in the converter power stage causing unexpected currents
Software with an unsuitable plausibility window

Symptoms

  • MIL, sometimes after a single trip
  • Reduced converter output and weak 12 V charging
  • Power reduction warning possible

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 bdcdc converterwiring harness

Related codes

P0E9BP0E9DP0E9EP0E9FP0E52P0EA1

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