🟡 Honda Jazz Mk4 1.5 i-MMD hybrid system warning

Hybrid system warning illuminates on the Honda Jazz Mk4 with the 1.5 i-MMD two-motor hybrid system. The fault is often caused by the 12V auxiliary battery deteriorating, which affects the hybrid system startup sequence. The Jazz uses a small lithium-ion 12V battery that should be replaced every 4-5 years. A Honda dealer can diagnose specific hybrid system faults. The two-motor e-CVT system has no physical gearbox oil to service, but the electric motor cooling system requires coolant checks.