Relearning and matching of Toyota Prius ABS C1251 and C1256 units is necessary. This service can also be availed in case the traction control light has lit up. We also recommend a brake oil flush with this service so that the ABS unit can give a long life. Toyota Prius, Aqua and newer radar variants are available with us. Our techs perfectly match the ABS units with other on board electronics.
C1251 – Malfunction in hydraulic brake booster pump motor
C1256 – Malfunction of accumulator low pressure
The Toyota Prius ABS light and the Traction light can turn on due to any problem with braking system. Since most of the Hybrid vehicles use regenerative braking to store electricity, any problem in ABS can cause a decline in the efficiency of vehicle.
Your Prius’s ABS system uses a system of sensors to determine wheel speed when braking. The antilock brake system runs through the ABS module. This module physically controls the anti-lock brake system If it becomes damaged, and can no longer control all four brakes, the ABS light will activate. Typically, corrosion is the most common reason why the module fails.
Read more here on Regenerative braking
or Toyota Prius Maintenance