A method for current sensor fault detection in a battery system comprises receiving a sequence of battery voltage samples from a voltage sensor configured to measure a battery voltage of a battery and a sequence of battery current samples from a current sensor configured to measure a battery current of the battery; determining a change in the battery voltage samples over a predetermined number of samples and a change in the battery current samples over the predetermined number of samples; checking whether a ratio of the change in the battery voltage samples and the change in the battery current samples is within an expected range for one of (i) a resistance of the battery and (ii) a conductance of the battery; and detecting a fault in the current sensor based on whether the ratio is within the expected range.