FAULT CODE READING

OBD2 codes.

A code identifies a signal or system that needs to be checked, not a part you should replace.

0 code entries · 1 related fault

P1BB2

System: Engine and transmission (P)
Code type: Manufacturer-specific code: its exact meaning depends on the make.

There is no code entry for P1BB2

Dual-clutch gearbox not engaging second gear and 12 V lithium battery overcharging (Niro II hybrid)Gearbox

Engine / equipment: Second-generation Kia Niro hybrid and plug-in hybrid with the 6-speed dual-clutch gearbox
Period mentioned: 2022–2023
Symptoms: Fault light and code P074A73 (second gear will not engage); on the hybrid, loss of power with “Check hybrid system, stop safely”, hybrid-system, service and charging warning lights and beeping for about ten seconds.
Possible cause described: Kia technical bulletin TRA106 (February 2023) for model-year 2023 Niro hybrids and plug-in hybrids built from 14/6/2022 to 12/12/2022: the clutch actuator and gearbox control unit earth bolts are tightened and the gearbox software is updated. In addition, service campaign SC335 (February 2025, superseding ELE318/SA553) updates the battery management software on Niro hybrids built from 21/6/2022 to 6/2/2023, because the 12 V lithium battery can overcharge (code P1BB2) and reduce power.
Check for the garage: Read codes P074A73 and P1BB2 and ask Kia by VIN whether bulletin TRA106 and the battery update have been applied.
Cost cited in the source: Free under warranty or the service campaign.A rough figure from the original database, not an up-to-date quote.