A plausibility error is when the ECU's detect a response that isn't what is expected, but there isn't a known error condition to put it down to. For example with an ABS sensor, if some magnetic reluctor segments are missing in the wheel bearing when they pass the sensor the ECU will activate the ABS on that wheel at slow speeds because it thinks the wheel is locking up, as that is exactly what the sensor sees, or rather doesn't see, when the wheel actually does lock up. But if it keeps seeing the same wheel locking up when none of the others are then that isn't plausible, so it alarms a plausibility fault.
If you sort the sensor communicaion failure then more than likely the plausibility error will disappear too.
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