EPAS3S family
EPAS3S_a091_espWsCsError
Not Available
What does the EPAS3S_a091_espWsCsError alert mean?
Invalid ESP_wheelSpeedsChecksum value received
What you'll see in your Tesla
- Not Available
What triggers it
Unexpected ESP_wheelSpeedsChecksum value observed
When it clears
Electronic Power Assist Steering (EPAS) observes expected ESP_wheelSpeedsChecksum
Potential impact
The power steering is operational but the level of assist is decreased
Affected models
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
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.