Powertrain, generic (extended)

P2C8F DC/DC Converter Temperature Sensor D Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C8F stands for a sensor D signal stuck above the upper edge of its permitted range. With a thermistor fed through a pull-up resistor, the voltage climbs towards the reference as soon as the loop is broken, so an unplugged connector, a cracked wire or a corroded pin is the classic finding; a short to a supply voltage gives the same picture. The resulting reading would be a converter colder than any real ambient. No manufacturer documents P2C8F publicly; FCA shows sensor D on the 2021 Ram 1500 eTorque but lists only P2C8D for it. CARB requires range monitoring of hybrid input components. Because a false cold value could hide real overheating, the controller treats the temperature as unknown and usually limits power. P2C8E is the low-signal counterpart.

Likely causes

Connector unplugged or sensor wire broken
Corroded or pushed-back pin at the converter connector
Signal shorted to a supply voltage

Symptoms

  • Hybrid system warning, MIL possible
  • Electrical power limited as a precaution

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–2,500
Time0.5–5 h

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

Parts involved

dcdc converter temp sensor dwiring harnessdcdc converter

Related codes

P2C8CP2C8DP2C8EP0E5BP2CA7

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