Powertrain, generic

P0E9D DC/DC Converter Current Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0E9D reports that the signal of DC/DC converter current sensor B has dropped below its valid range. Porsche documents it for the Taycan of model years 2020 to 2024 as P0E9D00, current sensor 2 of the converter with a short to ground, logged by the HV power electronics on the front axle (A49), the rear axle (A50) or both. A red warning tells the driver to stop safely because of an electrical fault, yet once the ignition has been cycled the entry is no longer active. Porsche blames a diagnostic threshold for current monitoring that was set too low and reprograms both control units, using PIWIS Tester version 43.500.000 or newer. Outside that case a real ground short or a dead sensor supply is the likely cause. The high counterpart is P0E9E.

Likely causes

Current monitoring threshold set too low in the software
Sensor B signal shorted to ground
Sensor supply missing inside the power electronics

Symptoms

  • Red warning to stop the vehicle safely
  • Fault no longer active after an ignition cycle
  • Drive power reduced or vehicle not ready to drive

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–2,500
Time0.5–5 h

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

Parts involved

dcdc current sensor bdcdc converterwiring harness

Related codes

P0E9EP0E9BP0E9CP0E9FP0E53P0EA2

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