PS491

SUBJECT:
GROUP
Engine
MODEL
2017MY
Niro (DE)
NUMBER
491
DATE
February 2017
Voltage Protection Device (VPD) DTCs
P1BA7 and P1B77
The Voltage Protection Device (VPD) (1) is mounted on top of the HV battery pack. If the HV
battery overcharges, the battery cells/modules/case can swell. If swelling occurs, the VPD
switch will turn ON, and the Battery Management System (BMS) will receive the VPD “ON”
signal and turn off the Power Relay Assembly (PRA) to prevent damage.
Exercise caution when working on or in the area of the HEV battery assembly. Leaning or
pressing on the VPD switch can cause:
 The switch to activate/turn ON,
 The BMS to turn OFF the PRA,
 The EV Warning Light to turn ON, and
 DTCs P1BA7/P1B77 to set. (These DTCs will prevent the vehicle from going into the
READY mode.)
CAUTION
Use caution not to touch or push on the VPD (1) as it may set DTCs: P1BA7 (Battery
Overcharge Detection Active) and P1B77 (HV Pre-Charge Fault), and result in an
inoperable vehicle.
 NOTICE
If DTCs P1BA7 and P1B77 are erased from the BMS, the P1BA7 will not recode and
only the PRA DTC P1B77 will display as an active DTC. Under these circumstances,
DO NOT replace the PRA assembly. Instead, remove the VPD, reset/unswitch the
VPD, reinstall, and erase all DTCs.
Page 1 of 1