Tesla engineering analysis EA24001
Loss of steering control. NHTSA’s Office of Defects Investigation opened this engineering analysis about the steering on 2 model years (2023). Opened Feb 1, 2024, closed Jun 25, 2026 after 2.4 years. It led to safety recall 25V092000. became a recall
What NHTSA says
Source: Office of Defects Investigation, as filedOn 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 until the vehicle reached 0 mph. If the vehicle was operating on the secondary system and reached 0 mph, the driver would lose electronic power-assisted steering with manual steering remaining available. Only manual steering would remain until the vehicle’s steering ECU is replaced. On February 19, 2025, Tesla filed safety recall 25V092 to address the loss of electronic power-assisted steering. The recall filing documents state that a steering ECU software update, identified as 2023.38.4, was introduced into production vehicles and provided to affected fleet vehicles through an over-the-air (OTA) update beginning in October 2023. The updated software was designed to prevent overvoltage breakdown and overstress of motor drive components on the printed circuit board. ODI’s analysis of related Vehicle Owner Questionnaires (VOQs) and Tesla field data found that complaint traffic declined following the 2023.38.4 software release. In view of the recall action taken by Tesla, ODI is closing this EA. ODI will continue to monitor the effectiveness of the remedy as is consistent with the Agency’s authority and practice. NHTSA reserves the right to take additional action if warranted by future circumstances. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.
A Engineering Analysis is the deeper stage, usually upgraded from a Preliminary Evaluation: NHTSA tests, requests engineering documents and decides whether a safety defect exists. The summary is the agency’s own text from its investigation file, unedited; the resumes carrying the full reasoning are linked below.
The paperwork NHTSA filed
Source: every document on this action, at nhtsa.gov- Opening resume — ODI’s own summary of why it opened this — the subject, what prompted it, and the vehicles in scope.
- Closing resume — ODI’s own summary of why it closed this, and what it concluded.
| Document | Code | Filed | At NHTSA |
|---|---|---|---|
| Opening resume | INOA | 2024 | |
| Closing resume | INCLA | 2024 | |
| Information request to the manufacturer | INIM | 2024 | |
| Manufacturer's response — full submission | INRL | 2024 | 3 files 123 |
| Memo granting a response extension | INRE | 2024 | 3 files 123 |
| Filed document | INOV | 2024 | |
| Confidential business information notice | INCCS | 2024 | 11 files 1234567891011 |
| Filed document | INCV | 2024 |
These are NHTSA’s own files, served from the agency’s site — the resumes are what ODI wrote when it opened and closed the action, and the rest is the correspondence behind them, including what the manufacturer sent when the agency asked. They are linked, not copied: where a document names the people who wrote in, that redaction is the agency’s to make and its copy is the one you should read.
What owners had already reported
Source: complaints on file the day it openedWhen NHTSA opened this on Feb 1, 2024, owners had filed 1,458 complaints with the agency about the model years above, of which 162 named the steering NHTSA went on to investigate. Owner complaints are the agency’s main early signal: ODI screens them, and a Preliminary Evaluation is usually where a pattern in them ends up.
This is what the complaint file held on that date, not a claim about which reports prompted the investigation — NHTSA’s complaint records carry no investigation number, so nobody can make that link from the data alone. The opening resume linked above names the reports ODI itself cited. Complaint records on this site begin with 2016.
What this means for an owner
Source: and what happens nextAn investigation is not a finding that a defect exists, and it puts no duty on anyone. NHTSA opens a Preliminary Evaluation when complaints and other reports suggest a condition worth asking the manufacturer about; it upgrades to an Engineering Analysis when the answers warrant testing; it closes either when it recommends a recall, when the manufacturer recalls on its own, or when no defect trend is found. The agency’s own goals are about four months for a petition, eight for a Preliminary Evaluation or a Recall Query and eighteen for an Engineering Analysis; many run longer.
This one became a recall. The campaign page carries the manufacturer’s filed defect, risk and remedy, the build window and every model year covered; whether one specific vehicle is included is settled by VIN at nhtsa.gov/recalls.
Model years it names
Source: as NHTSA filed themA vehicle page’s investigation list carries the same action; a name here is the scope NHTSA opened, not a list of affected VINs.
Common questions
Source: NHTSA Office of Defects InvestigationIs EA24001 a recall?
No — it is the investigation that led to one. Recall 25V092000 is the campaign; its page carries the remedy.
Is EA24001 still open?
No. It closed on Jun 25, 2026 and led to recall 25V092000.
Which vehicles does EA24001 cover?
NHTSA opened it on 2 model years: 2023 Tesla Model 3, 2023 Tesla Model Y. That is the scope of the inquiry, not a list of affected vehicles; a recall, if one follows, defines its own population by VIN.