MyTeslaMate
IDB family

IDB_a100_RCMcollisionChecksum

Not Available

What does the IDB_a100_RCMcollisionChecksum alert mean?

Restraint Control Module (RCM) collision message RCM_collision checksum is incorrect.

What you'll see in your Tesla

  • Not Available

What triggers it

RCM_collision is received with incorrect CRC for longer than 100 milliseconds.

When it clears

RCM_collision Controller Area Network (CAN) message is received with correct Cyclic Redundancy Check (CRC) for 100 milliseconds.

Potential impact

Secondary Collision Mitigation (SCM) may be unavailable. There may be an issue with the transmitting Electronic Control Unit (ECU) or CAN bus. The vehicle should be driven with extreme caution.

Affected models

Model Y 2025+

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Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.