Powertrain, generic (extended)

P2CAB DC/DC Converter Temperature Sensor F Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2CAB is set when DC/DC converter temperature sensor F delivers a voltage above the top of its valid band. For a thermistor input this is the typical signature of an open circuit, since the pull-up drags the line to reference voltage, or of a short to a higher voltage. The resulting value would be colder than the surroundings, which a working converter can never be. No manufacturer documents P2CAB publicly; bulletins name converter sensors only up to letter D. CARB requires range monitoring of hybrid input components. Checking the connector at the converter, its locking and the terminals for spread or corrosion comes first, as the sensor is frequently built into the converter assembly. P2CAA is the low counterpart, P2CA7 the same fault for sensor E.

Likely causes

Converter connector not latched or terminals spread
Broken signal or return wire of sensor F
Signal line shorted to a higher voltage

Symptoms

  • MIL and hybrid system warning on
  • Converter temperature shown far below ambient
  • Reduced 12 V supply from the converter

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 fwiring harnessdcdc converter

Related codes

P2CA9P2CAAP2CACP2CA7P2C8FP0E5B

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.