What Does P0B93 Mean?
The battery management system has detected that the voltage reading from hybrid battery sense circuit "R" exceeds the maximum expected threshold. This high-voltage condition may be caused by an overcharged cell, an open sense wire, or a cell with reduced capacity reaching its voltage limit prematurely.
Safety Warning
An overcharged cell poses a thermal runaway risk. Do not drive if cell voltage is genuinely elevated. Immediate professional inspection is required.
Common Causes
35%
Open voltage sense wire causing a floating high reading at the controller input
30%
Overcharged or imbalanced cell within module "R"
20%
Disconnected or backed-out pin at the module connector
15%
Battery management controller A/D converter fault
Diagnostic Steps
1
Step 1: Read the voltage for cell group "R" via scan tool and compare to other modules.
2
Step 2: With the HV system de-energized, directly measure module "R" voltage at terminals with a DVOM.
3
Step 3: Check sense wire continuity end-to-end — an open wire causes a floating high reading.
4
Step 4: Inspect connector pins at both ends for backed-out terminals or corrosion.
5
Step 5: If cell voltage is genuinely high, perform a discharge balance test to evaluate cell capacity.
Estimated Repair Cost
$200 - $4,500
Parts + labor, varies by vehicle and location
The battery management system has detected that the voltage reading from hybrid battery sense circuit "R" exceeds the maximum expected threshold. This high-voltage condition may be caused by an overcharged cell, an open sense wire, or a cell with reduced capacity reaching its voltage limit premature...
The most common cause of P0B93 (Hybrid Battery Voltage Sense "R" Circuit High) is: Open voltage sense wire causing a floating high reading at the controller input
Typical repair costs for P0B93 range from $200 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An overcharged cell poses a thermal runaway risk. Do not drive if cell voltage is genuinely elevated. Immediate professional inspection is required.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B93 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery Pack / High-Voltage System
Difficulty
Type
Generic (SAE)
Recommended Tools
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