P0BD9: inverter B sensor 2 high voltage uses a startup warm-up condition

GM identifies P0BD9 as inverter B temperature sensor 2 circuit high. A generic reader labels that channel inverter temperature sensor D. In this table, high means electrical signal voltage near five volts, associated with PIM Temp 1 below −40°C.

A cold-looking value can be an electrical fault

The inverse signal relationship means that this code should not be interpreted as a high-temperature warning merely from its title. Compare the affected channel with the other temperature reports and retain its circuit-fault status when judging whether the displayed value is physically credible.

For a malfunction already present at trip start, the source requires at least 1.5 minutes of accumulated inverter warm-up above its absolute-torque threshold. The continuation appears on the next physical page. Ignoring it can lead to an incorrect expectation that the monitor always completes immediately after wakeup.

Retest under the actual prerequisites

The wakeup signal must be on, and the row uses a repeated-count filter at a 10.4 ms rate. These are calibration conditions, not an invitation to create torque or heat without the proper service procedure.

The summary does not identify a particular connector defect or require replacing the inverter. Vehicle-specific circuit information and trained high-voltage personnel are needed for physical diagnosis. Verify credible sensor behavior during eligible operation rather than treating cleared memory as repair confirmation.

Source and applicability

GM 2010 10OBDG10 Hybrid Diagnostics, cited BPCM or hybrid-controller monitor only. Historical calibration values are not universal specifications; no per-code model, engine or hardware fitment has been established. GM PDF, physical page 301 · GM PDF, physical page 302.