B0099 indicates a malfunction detected within the vehicle's roll over sensor circuit or system. This sensor is part of the safety restraint or convertible top protection system designed to activate during a tip-over event. The code suggests the control module has detected an implausible signal, open circuit, or internal fault within the sensor.
The internal accelerometer or switch within the sensor has failed.
Wires leading to the sensor are broken, chafed, or shorted.
Corrosion or looseness at the sensor connector.
Weak battery or charging issues affecting safety module operation.
Structural deformation affecting sensor mounting or alignment.
Internal fault within the airbag or restraint control unit.
No, module failure is rare; the sensor or wiring is the usual cause.
The vehicle will drive, but safety systems may not deploy correctly in a rollover.
You can clear it, but it will return if the underlying fault is not repaired.
No, this is a body safety system code unrelated to engine emissions.