The instrument cluster module is linked to the Engine Control Module (ECM) via these data link wires. The function is used to calculate functions related to time limits.
Conditions for diagnostic trouble code (DTC):
1) Internal fault in electronic control unit (ECU)
Probable cause
1) Instrument cluster
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Allison 1000 & 2000 Gen 5 Fault Code:U0074 CAN Communications BUS 2 Off
1000 & 2000 Gen 5