High Voltage Battery
The traction battery, running at several hundred volts DC and supplying every part of the propulsion system. Lethal to touch — this is not a shock hazard but an electrocution one, and no part of it is suitable for home repair or for a workshop without high-voltage training. It isolates itself through contactors that open whenever the interlock loop is broken, whenever the car is switched off, and in a crash. Two things are widely misunderstood about it: gradual capacity loss with age is designed-for behaviour rather than a fault, and a fully charged pack is completely unreachable if the ordinary 12 volt battery is flat, because that small battery is what wakes the computers that close the contactors.
Also known as: traction battery, hv battery, hybrid battery, battery pack, main battery, propulsion battery, hv pack
Referenced by 795 codes
Codes involving this component (795)
- P0A0A High Voltage System Interlock Circuit A Stop driving Critical
- P0A0B High Voltage System Interlock Circuit A Performance Stop driving Critical
- P0A0C High Voltage System Interlock Circuit A Low Stop driving Critical
- P0A0D High Voltage System Interlock Circuit A High Stop driving Critical
- P0A0E High Voltage System Interlock Circuit A Intermittent Stop driving Critical
- P0D23 Battery Charger A Output Shorted Stop driving Critical
- P0D5E Battery Charger Hybrid/EV System Discharge Time Too Long Critical
- P0D85 Battery Charging Output Voltage Too High Critical
- P0DAA Battery Charging System Isolation Fault Critical
- P0DE6 Hybrid/EV Battery Pack Cell Voltage Low Stop driving Critical
- P0DE7 Hybrid/EV Battery Pack Cell Voltage High Critical
- P0E2E Battery Charger A Fuse Stop driving Critical
- P0E2F High Voltage Fuse B Stop driving Critical
- P0E30 High Voltage Fuse C Stop driving Critical
- P0E74 Hybrid/EV Battery Voltage Internal Isolation Fault Critical
- P0A08 DC/DC Converter Status Circuit High
- P0A0F Engine Failed to Start High
- P0A1F Battery Energy Control Module A Performance High
- P0A27 Hybrid/EV Battery Power Off Circuit High
- P0A28 Hybrid/EV Battery Power Off Circuit Low High
- P0A29 Hybrid/EV Battery Power Off Circuit High High
- P0A7E Hybrid/EV Battery Pack A Over Temperature High
- P0A7F Hybrid/EV Battery Pack A Deterioration High
- P0A80 Replace Hybrid/EV Battery Pack High
- P0A82 Hybrid/EV Battery Pack Cooling Fan 1 Performance/Stuck Off High
Other components in Hybrid Propulsion
- Power Inverter 370
- Motor Generator 249
- Hybrid/EV Battery Pack Sensor Module 243
- Battery Energy Control Module 228
- On-Board Charger 209
- Hybrid Battery Contactor 136
- Charge Port 131
- DC-DC Converter 99
- Inverter Coolant Pump 92
- Motor Current Sensor 73
- Electric A/C Compressor 63
- Inverter Coolant Temperature Sensor 60
- Motor Position Sensor 59
- Hybrid Battery Cooling Fan 54
- Battery Pack Coolant Control Valve 47
- Hybrid/EV Battery Pack Current Sensor 30
- Hybrid Powertrain Control Module 19
- Motor Temperature Sensor 18
- High Voltage Interlock Loop 15
- Drive Motor Control Module 15
- Active Engine Mount 6
- Starter/Generator 6
- High Voltage Service Disconnect 5
- Fuel Cell Stack 2
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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