7042 SPN Fault Code

Name:

Message Checksum

Description:

The message checksum is used to verify the signal path from the transmitting device to the receiving device. The message checksum is calculated using the first 7 data bytes, the message counter and the bytes of the message identifier. It is calculated as follows: Message Checksum = ((Byte 1 + Byte 2 + Byte 3 + Byte 4 + Byte 5 + Byte 6 + Byte 7 + Message ID low order byte + Message ID mid low byte + Message ID mid high byte + Message ID high order byte) & FFh) Where Message ID low order byte = Source Address from 29-bit header Message ID mid low byte = PDU Specific (PS) from 29-bit header Message ID mid high byte = PDU Format (PF) from 29-bit header Message ID high order byte = 6 bits of �0� followed by EDP and DP bits from 29-bit header

7042 spn fault code name is Message Checksum. If you don't take the time to look into 7042 spn fault when it arises, it can add up quickly. One small issue like 7042 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 7042 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

7042 SPN Fault Code

Name:

Description:

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