Code
P0B15
Generic
P — Powertrain
Hybrid/EV Battery Pack Voltage Sense B Circuit Range/Performance
Views:
UK: 21
EN: 30
RU: 24
AI status
Completed
Completed
100%
Causes
- Open or short in the voltage sense B wiring or connector
- Corroded, loose, or damaged sense connector pins or terminals
- High-resistance connection in the sense circuit (poor crimp, corrosion)
- Faulty battery management system (BMS) or HV battery ECU input channel
- Failed or degraded voltage divider/resistor network inside the HV battery or service module
- Actual battery pack voltage problem (intermittent cell/module failure affecting sense circuit)
Symptoms
- HV system warning or battery system malfunction lamp illuminated
- Hybrid/EV system may go into reduced-power or limp mode
- Inability to charge or start EV/hybrid drive, charging disabled
- Reduced or no regenerative braking
- Inconsistent or incorrect battery pack voltage displayed by vehicle diagnostics
- Intermittent faults that may clear then return
What to check
- Read stored and pending codes and freeze-frame data with a capable scan tool
- Check for other HV or BMS-related DTCs (isolation, pack communication, current sensor)
- Compare pack voltage reported by BMS to independent measurement at service disconnect (use HV-rated meter and PPE)
- Visually inspect all HV battery connectors, junctions and harnesses for damage, corrosion, moisture, or loose pins
- Inspect sense circuit wiring for chafing, pinched sections, or poor routing that could cause intermittent contact
- Check continuity and insulation resistance of the sense wiring (with HV system disabled and isolated per manufacturer procedure)
Signal parameters
- Signal type: low-voltage analogue proportional to HV pack voltage (typically 0–5.0 V) via a resistor divider
- Expected behavior: sense voltage scales linearly with pack voltage; no sudden jumps or open-circuit indication
- Typical sense voltage range: ~0.0 V at 0 V pack to ~4–5 V near maximum pack voltage (vehicle-specific divider)
- Comparator thresholds: BMS expects signal to be within programmed min/max windows and stable during measurement
- Communications: BMS may also report pack voltage over CAN—compare both sources
Diagnostic algorithm
- Ensure vehicle is made safe for HV work per manufacturer procedures (remove service plug, isolate HV system, wear PPE)
- Retrieve all HV/BMS codes and freeze-frame data; note pack voltage, ambient temp, and ignition state when DTC set
- Recreate or monitor the fault while logging BMS-reported pack voltage and sense-channel voltage if available
- Perform a visual inspection of battery pack connector B, junction block and harness routing; repair any damaged insulation or terminals
- With HV system safely isolated, perform continuity and resistance checks on sense B wiring between the BMS connector and the battery pack sense terminal; look for opens, shorts to ground, and high resistance
- Measure the low-voltage sense signal at the BMS with the pack connected (follow safety procedures) and compare to actual pack voltage measured at service disconnect; verify divider ratio and linearity across pack voltage range
- Wiggle-test connectors and harness while monitoring sense voltage or live data to find intermittent faults
- If wiring and connectors are good, inspect/replace the voltage divider or sense board at the battery pack (or repair internal pack connector) per manufacturer guidance
- If the sense hardware at the pack is confirmed good, consider replacing or reprogramming the BMS input module or control unit only after confirming fault is not wiring-related
- After repairs, clear codes and perform a full functional test including charge/discharge and road test to confirm no return of the DTC
Likely causes
- Open or shorted sense harness between battery pack and BMS
- Corroded or water-intruded connector at the battery pack junction block
- High resistance at crimped terminal or damaged terminal sleeve
- Failed voltage divider or sensing board inside the HV battery pack assembly
- BMS input channel failed
Fault status
Status
Hybrid/EV battery pack voltage sense B circuit range/performance fault. BMS reports voltage-sense-B out of expected range or inconsistent. HV functionality may be limited until resolved.
Repair difficulty: Hard
Diagnostic time: 2.0-5.0 hours
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Code
P0B15
LAND ROVER
P — Powertrain
Battery for electric/hybrid vehicle - Voltage - Direction B - Range of performance / performance
Views:
UK: 15
EN: 22
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in the voltage sense B wiring or connector
- Corroded, loose, or damaged sense connector pins or terminals
- High-resistance connection in the sense circuit (poor crimp, corrosion)
- Faulty battery management system (BMS) or HV battery ECU input channel
- Failed or degraded voltage divider/resistor network inside the HV battery or service module
- Actual battery pack voltage problem (intermittent cell/module failure affecting sense circuit)
Symptoms
- HV system warning or battery system malfunction lamp illuminated
- Hybrid/EV system may go into reduced-power or limp mode
- Inability to charge or start EV/hybrid drive, charging disabled
- Reduced or no regenerative braking
- Inconsistent or incorrect battery pack voltage displayed by vehicle diagnostics
- Intermittent faults that may clear then return
What to check
- Read stored and pending codes and freeze-frame data with a capable scan tool
- Check for other HV or BMS-related DTCs (isolation, pack communication, current sensor)
- Compare pack voltage reported by BMS to independent measurement at service disconnect (use HV-rated meter and PPE)
- Visually inspect all HV battery connectors, junctions and harnesses for damage, corrosion, moisture, or loose pins
- Inspect sense circuit wiring for chafing, pinched sections, or poor routing that could cause intermittent contact
- Check continuity and insulation resistance of the sense wiring (with HV system disabled and isolated per manufacturer procedure)
Signal parameters
- Signal type: low-voltage analogue proportional to HV pack voltage (typically 0–5.0 V) via a resistor divider
- Expected behavior: sense voltage scales linearly with pack voltage; no sudden jumps or open-circuit indication
- Typical sense voltage range: ~0.0 V at 0 V pack to ~4–5 V near maximum pack voltage (vehicle-specific divider)
- Comparator thresholds: BMS expects signal to be within programmed min/max windows and stable during measurement
- Communications: BMS may also report pack voltage over CAN—compare both sources
Diagnostic algorithm
- Ensure vehicle is made safe for HV work per manufacturer procedures (remove service plug, isolate HV system, wear PPE)
- Retrieve all HV/BMS codes and freeze-frame data; note pack voltage, ambient temp, and ignition state when DTC set
- Recreate or monitor the fault while logging BMS-reported pack voltage and sense-channel voltage if available
- Perform a visual inspection of battery pack connector B, junction block and harness routing; repair any damaged insulation or terminals
- With HV system safely isolated, perform continuity and resistance checks on sense B wiring between the BMS connector and the battery pack sense terminal; look for opens, shorts to ground, and high resistance
- Measure the low-voltage sense signal at the BMS with the pack connected (follow safety procedures) and compare to actual pack voltage measured at service disconnect; verify divider ratio and linearity across pack voltage range
- Wiggle-test connectors and harness while monitoring sense voltage or live data to find intermittent faults
- If wiring and connectors are good, inspect/replace the voltage divider or sense board at the battery pack (or repair internal pack connector) per manufacturer guidance
- If the sense hardware at the pack is confirmed good, consider replacing or reprogramming the BMS input module or control unit only after confirming fault is not wiring-related
- After repairs, clear codes and perform a full functional test including charge/discharge and road test to confirm no return of the DTC
Likely causes
- Open or shorted sense harness between battery pack and BMS
- Corroded or water-intruded connector at the battery pack junction block
- High resistance at crimped terminal or damaged terminal sleeve
- Failed voltage divider or sensing board inside the HV battery pack assembly
- BMS input channel failed
Fault status
Status
Hybrid/EV battery pack voltage sense B circuit range/performance fault. BMS reports voltage-sense-B out of expected range or inconsistent. HV functionality may be limited until resolved.
Repair difficulty: Hard
Diagnostic time: 2.0-5.0 hours
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