4975 SPN Fault Code

Name:

Crash Checksum

Description:

The Crash Checksum is used to verify the signal path from the airbag ECU to other devices in case of a crash.The 4 bit checksum is the sum of the high nibble and the low nibble of the sum of the identifier, the first 7 data bytes and the 4 bit message counter. It is calculated as follows: Checksum = (Byte1 + Byte2 + Byte3 + Byte4 + Byte5 + Byte6 + Byte7 + (message counter & 0Fh) + message ID low byte + message ID mid low byte + message ID mid high byte + message ID high byte) Checksum = ((Checksum >> 4) + Checksum) & 0Fh

4975 spn fault code name is Crash Checksum. If you don't take the time to look into 4975 spn fault when it arises, it can add up quickly. One small issue like 4975 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 4975 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.

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