What Does P0BA6 Mean?
DTC P0BA6 indicates the hybrid battery voltage sense circuit for group "V" is reading lower than the expected minimum threshold. The BMS is detecting an abnormally low voltage on this sensing line, which could indicate a short to ground in the sense wiring, severely depleted cells, or a failed connection that is pulling the voltage reading down.
Safety Warning
A low voltage condition in a cell group can indicate deep discharge that risks cell reversal, internal short circuits, and potential thermal runaway. The hybrid system may reduce power output or disable electric drive to protect the battery. Immediate diagnosis is recommended.
Common Causes
30%
Short to ground in the group V voltage sense wiring
25%
Severely degraded or failed cells within group V
20%
Open or high-resistance cell tap connection causing voltage drop
15%
Water intrusion or corrosion in the voltage sense connector
10%
BMS voltage sense IC input failure reading low
Diagnostic Steps
1
Record freeze frame data and note the reported voltage for group V. Compare against the nominal expected voltage for that cell group configuration.
2
Measure the actual cell group voltage directly at the battery module cell taps using a high-impedance multimeter to determine if the low reading reflects true cell voltage or a circuit fault.
3
Inspect the voltage sense harness for group V from the BMS to the battery module, checking for chafing, pinched wires, or insulation damage that could cause a short to ground.
4
Check the connector terminals for water intrusion, corrosion, or green deposits that could create a resistive path to ground.
5
If cell voltage is genuinely low, perform individual cell testing within the group to identify which cell(s) are failing and determine if module replacement is needed.
Estimated Repair Cost
$200 - $4,500
Parts + labor, varies by vehicle and location
DTC P0BA6 indicates the hybrid battery voltage sense circuit for group "V" is reading lower than the expected minimum threshold. The BMS is detecting an abnormally low voltage on this sensing line, which could indicate a short to ground in the sense wiring, severely depleted cells, or a failed conne...
The most common cause of P0BA6 (Hybrid Battery Voltage Sense "V" Circuit Low) is: Short to ground in the group V voltage sense wiring
Typical repair costs for P0BA6 range from $200 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low voltage condition in a cell group can indicate deep discharge that risks cell reversal, internal short circuits, and potential thermal runaway. The hybrid system may reduce power output or disable electric drive to protect the battery. Immediate diagnosis is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BA6 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery / High-Voltage System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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