P0B3D fault code: what it means

P0B3D: Hybrid battery voltage sensor A circuit low on a Lexus hybrid: low voltage on one battery block sense line.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

corroded bus bars or sense terminals
damaged sense wire
weak battery module
battery ECU fault

P0B3D by make

Lexus

Hybrid battery voltage sensor A circuit low on a Lexus hybrid: low voltage on one battery block sense line.

Usual causes: corroded bus bars or sense terminals; damaged sense wire; weak battery module; battery ECU fault

Toyota

Hybrid battery voltage sensor A circuit low: the battery ECU sees low voltage on one block sense wire. Usually corrosion on the battery bus bars or a weak module.

Usual causes: corroded bus bars or voltage sense terminals; damaged sense wire; weak or failed battery module; battery ECU fault

What the repair usually costs

12 V battery replace, standard flooded (small / medium car)NZ$190–NZ$330 · A$170–A$310
12 V battery replace, standard flooded (SUV / ute / 4WD)NZ$290–NZ$500 · A$270–A$460
Alternator replace (small / medium car, petrol)NZ$510–NZ$1,020 · A$480–A$1,000
Alternator replace (SUV / ute / diesel)NZ$750–NZ$1,560 · A$710–A$1,490

Not sure what P0B3D means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.