P0A4B fault code: what it means

P0A4B: Generator position sensor (resolver) circuit on a Lexus hybrid. Engine may not start and the car may not go into READY.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

resolver connector or wiring fault
failed generator resolver
inverter/MG ECU fault

P0A4B by make

Lexus

Generator position sensor (resolver) circuit on a Lexus hybrid. Engine may not start and the car may not go into READY.

Usual causes: resolver connector or wiring fault; failed generator resolver; inverter/MG ECU fault

Toyota

Generator (MG1) position sensor (resolver) circuit fault. The engine may not start and the car may not go into READY.

Usual causes: resolver connector or wiring fault at the transaxle; failed MG1 resolver; inverter/MG ECU fault

What the repair usually costs

Hybrid battery new genuine (Camry / RAV4 / Kluger / Lexus)NZ$5,310–NZ$10,550 · A$5,120–A$9,890

Not sure what P0A4B 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.