Engineering Analysis · Closed
Loss of steering control
Manufacturer: Tesla, Inc.
This investigation led to a recall
NHTSA links this probe to recall campaign 25V092.
Campaign 25V092 predates our recall archive — check NHTSA.gov for details.
What NHTSA is examining
On July 28, 2023, the Office of Defects Investigation (ODI) opened a Preliminary Evaluation (PE23014) to investigate instances of loss of electronic power-assisted steering in MY 2023 Tesla Model 3 and MY 2023 Tesla Model Y vehicles manufactured by Tesla, Inc. The complaints allege a sudden and unexpected inability to turn the steering wheel or an increase in effort required to turn the steering wheel. These conditions were alleged to occur both during the drive cycle, at various speeds, and at vehicle start up. Consumers reported receiving the warning message “Steering assist reduced” either before, during, or after the loss of steering control, and some consumers described their steering begin to feel “notchy” or “clicky” either prior to or just after the incident. On February 1, 2024, PE23014 was upgraded to EA24001 to further investigate the alleged defect in the affected vehicles. Tesla identified the cause of the increase in steering effort as an overvoltage breakdown (the voltage applied exceeds the maximum design limit), which can overstress motor drive components on the printed circuit board of the vehicle’s steering Electronic Control Unit (ECU). If the primary motor drive components experienced an overvoltage breakdown occurrence while the vehicle was traveling above 0 mph, electronic power-assisted steering would be diverted to secondary motor drive components. The secondary, or backup, motor drive components would maintain electronic power-assisted steering…
Vehicles under investigation
Source: NHTSA Office of Defects Investigation records, updated daily. An investigation is not a determination that a defect exists; many probes close without a recall.