DTC P0571 will set if the vehicle speed has cycled from 0-60 km/h (0-37 mph) 5 times without seeing a change in the brake status.
If DTC P0571 sets and there is no code DTC P0572 or DTC P0573, then the PCM has failed internally.
Verify DTCs P0572 and P0573 are not present. If either are present, refer to these DTCs first. If no DTCs are present, replace the PCM.