Conditions for Setting the DTC

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The ECM uses two ways to determine if the transfer case is in 4 low. The first way is to compare the transmission output speed sensor to the transfer case speed sensor in order to calculate transfer case range. The second way is to use a LAN message sent by the transfer case shift control module. If the first way and second way of determining this does not match while in 4 high then this DTC is set.
The ECM has detected 32 fail counts out of 400 samples.