DTC U0401 - Invalid Data Received From ECM/Pcm A

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U0401 - INVALID DATA RECEIVED FROM ECM/PCM A

Description:	Network DTC concerns occur during module to module communication.
Possible Causes:	Invalid data network concerns - data is transferred within the normal inter-module message, but contains known invalid data. The transmitting module logs a DTC related to the invalid data concern. Missing message network concerns - missing message concerns are logged by the module upon failure to receive a message from another module within a defined retry period.
Diagnostic Aids:	Check for other reductant dosage control module DTCs or reductant dosage control module related symptoms. Diagnose all other reductant dosage control module DTCs or reductant dosage control module related symptoms first.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST RM .