Powertrain, generic (extended)

P2C8D DC/DC Converter Temperature Sensor D Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2C8D is the plausibility test of DC/DC converter temperature sensor D: the voltage is electrically valid, but the temperature it implies does not match what the controller expects. Typical cross-checks compare the sensor with its neighbours after a long rest or look for a value that hardly changes while the converter works hard. FCA applies the code to its eTorque Ram 1500 pickup of model year 2021 (3.6 L V6), next to P0C39, P0C3E and P0E59 for the other converter sensors. Bulletin 08-037-21 flashes new Hybrid Control Processor software for trucks built up to 5 January 2021, and with it P2C8D becomes a one-trip fault, so the MIL lights after the first failed drive. FCA does not publish its limits. CARB demands rationality checks for hybrid component temperature sensors.

Likely causes

Hybrid control software level (FCA HCP update per 08-037-21)
Sensor D drifting and disagreeing with the other converter sensors
Uneven cooling of the converter, e.g. low coolant or air in the circuit

Symptoms

  • MIL on, with newer FCA software after one faulty drive
  • Reduced eTorque assist or start-stop availability

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–2,500
Time0.3–5 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

P2C8CP2C8EP2C8FP0E59P0C39P0C3E

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