Toyota
Lost communication with the hybrid battery sensor module (battery ECU). The hybrid ECU cannot read the battery, so hybrid operation is shut down or limited.
U029A fault code: what it means
U029A: Lost communication with the hybrid battery sensor module (battery ECU). The hybrid ECU cannot read the battery, so hybrid operation is shut down or limited.
Usual causes, most likely first
- battery ECU power, earth or fuse fault
- communication wiring or connector fault
- failed battery ECU
U029A by make
What the repair usually costs
- Hybrid battery reconditioned exchange (Aqua / Prius C / Axio / Fielder)NZ$1,360–NZ$2,430 · A$1,390–A$2,370
- Hybrid battery reconditioned exchange (Prius 20 / 30 / Prius alpha / Prius V)NZ$1,640–NZ$2,790 · A$1,880–A$3,550
- Hybrid battery reconditioned exchange (Camry / Estima / Lexus / RAV4)NZ$2,140–NZ$4,150 · A$2,650–A$5,000
- Hybrid battery new aftermarket (Aqua / Prius C)NZ$2,080–NZ$3,010 · A$2,350–A$3,610
Not sure what U029A 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.