P0BF7: motor B phase V low is evaluated with PWM output disabled

P0BF7 identifies motor B phase V current-sensor circuit low in the GM hybrid parameter table. The important finding is an out-of-range sensor report under a defined controller state. It does not alone establish the magnitude or direction of physical motor current.

Recover the monitor conditions

The published threshold is phase V sensor output below −700 A. The wakeup signal must be on while PWMOutputEnable is FALSE. A diagnostic record should preserve that disabled-output state with the reported value rather than interpret the number as an ordinary driving measurement.

The failure filter is ten qualifying counts out of fifteen at a 2.08 ms rate. Two-trip reporting is listed separately. These details distinguish the calibrated monitor result from one isolated live-data update.

Understand the effect on other checks

The phase V offset monitor is inhibited while P0BF7 or P0BF8 is active. No new offset code does not necessarily indicate a normal phase V sensor when a direct range problem remains.

The source does not supply a universal connector test, part replacement or safe current-injection method. A qualified hybrid technician must use the correct vehicle procedure to identify the signal and verify measurement integrity. Output disable is not confirmed high-voltage isolation. After repair, credible sensing and eligible monitor operation provide stronger evidence than merely clearing the code memory.

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 297.