P2C8E DC/DC Converter Temperature Sensor D Circuit Low

P2C8E is logged when the voltage from DC/DC converter temperature sensor D drops under the lower limit of its window. Power electronics mostly use NTC thermistors, where a falling voltage means rising temperature; an implausibly low value therefore reads as a converter far hotter than it can be. The usual culprits are a signal wire touching ground, a crushed harness or a thermistor that has shorted internally, much less often real overheating. No manufacturer documents P2C8E publicly; FCA proves sensor D exists on the 2021 Ram 1500 eTorque but names only P2C8D for it. CARB requires out-of-range checks on hybrid input components. Since the controller has to assume overtemperature, it tends to throttle the converter straight away. P2C8F covers the opposite direction.

Likely causes

Symptoms

• Hybrid or charging system warning
• Converter derated right away, less electrical power available

Repair estimate

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

Parts involved

Related codes

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