What Does P0B95 Mean?
The battery management system has detected a general malfunction in hybrid battery voltage sense circuit "S." This circuit monitors a specific cell group within the HV battery pack, and the ECM has determined the signal is absent, incorrect, or outside normal operating parameters.
Common Causes
35%
Open or damaged voltage sense wire between battery module "S" and the battery management controller
30%
Corroded or disconnected connector at battery module "S"
20%
Failed battery management controller input channel
15%
Degraded battery cell producing an out-of-range reading
Diagnostic Steps
1
Step 1: Access hybrid battery voltage data via scan tool and compare cell group "S" reading against all other groups.
2
Step 2: With the HV system de-energized, inspect the sense harness connector at module "S" for physical damage, corrosion, or backed-out pins.
3
Step 3: Measure sense wire continuity from the controller connector pin to the module "S" terminal.
4
Step 4: Check for shorts between the sense wire and ground, and between adjacent sense circuits.
5
Step 5: Run manufacturer-specific battery controller self-tests if wiring checks pass.
Estimated Repair Cost
$150 - $3,500
Parts + labor, varies by vehicle and location
The battery management system has detected a general malfunction in hybrid battery voltage sense circuit "S." This circuit monitors a specific cell group within the HV battery pack, and the ECM has determined the signal is absent, incorrect, or outside normal operating parameters.
The most common cause of P0B95 (Hybrid Battery Voltage Sense "S" Circuit) is: Open or damaged voltage sense wire between battery module "S" and the battery management controller
Typical repair costs for P0B95 range from $150 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Power output may be limited and EV mode may be disabled. Prompt inspection is recommended to ensure continued safe battery monitoring.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0B95 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
OBD2 Scanner
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