Powertrain, generic

P0E55 DC/DC Converter Current Sensor A Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0E55 deals with a current sensor A reading that flickers or vanishes for moments instead of failing for good. FCA documents it repeatedly for the Ram 1500 with eTorque mild hybrid, where the DC/DC converter sits in the 48 V battery pack and is run by the battery pack control module (BPCM). Bulletin 08-030-24 for the 2019 model lists P0E55 among ten BPCM codes; 08-333-25 and its revision 08-283-26 for the 2025 truck with the 3.6 litre V6 name it alone and describe the result: the 12 V battery is not kept charged, runs flat soon after driving and may leave the truck needing a tow, later also with limp-home mode and disabled start/stop. In all cases the fix is new BPCM software, not a part. Steady circuit faults are P0E51, P0E53 and P0E54.

Likely causes

Battery pack control module software (FCA eTorque, reflash)
Loose or corroded contact in the sensor path
Current sensor or converter electronics failing intermittently

Symptoms

  • MIL on
  • 12 V battery not charging, flat soon after driving
  • Limp-home mode and start/stop disabled

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–2,000
Time0.3–4 h

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

Parts involved

dcdc current sensor awiring harnessdcdc converter

Related codes

P0E51P0E52P0E53P0E54P0E9F

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.