P2CAA DC/DC Converter Temperature Sensor F Circuit Low

P2CAA reports that the input for DC/DC converter temperature sensor F reads too low. With the usual thermistor circuit this corresponds to an impossibly hot reading, so the controller suspects the signal path before the hardware: a ground short in the harness, moisture in the connector or a thermistor that failed short. A useful check is whether the value stays low with the vehicle cold and the converter idle, since a real temperature would have dropped long ago. No manufacturer documents P2CAA publicly, and the lettered converter sensors named in bulletins end at D. CARB requires hybrid input components to be monitored for out-of-range signals. The converter is normally throttled or shut off. Siblings: P2CAB (high), and P2CA6 for sensor E.

Likely causes

Symptoms

• MIL and hybrid or charging warning on
• Very high converter temperature shown even with a cold vehicle
• Converter limited or switched off

Repair estimate

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

Parts involved

Related codes

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