Toyota defect petition DP26006
Road debris/rocks damaging the heat exchangers. NHTSA’s Office of Defects Investigation opened this defect petition about the cooling system on 3 model years (2024–2026). Opened Aug 20, 2026 and still open — 2 months so far, against NHTSA’s goal of four months for a defect petition. open
What NHTSA says
Source: Office of Defects Investigation, as filedThe Office of Defects Investigation (ODI) received a Petition dated July 20, 2026. The Petition requests an investigation of road debris / rocks damaging the heat exchangers in model year (MY) 2024-2026 Toyota Grand Highlander vehicles. The Petition contends that the Grand Highlander’s front-end grill has large, open apertures and no protective screen between the grill and the vehicle’s heat exchangers. The Petition further alleges that as a result, during normal driving, the damage to heat exchangers results in coolant leakage and sudden loss of propulsion. The Petitioner cites thirteen (13) complaints received by ODI alleging this failure, which, when added to the petitioner’s own complaint, bring the total under consideration at this time to fourteen (14). ODI will evaluate these complaints to determine if they are related to the failure cited in the Petition and conduct a technical review under 49 CFR Part 552. This Defect Petition is being opened to evaluate whether to grant or deny the petition. The petition can be reviewed at NHTSA.gov under ODI number 11754975.
A Defect Petition is a petition from a member of the public asking NHTSA to open a defect investigation; the agency grants or denies it and publishes the reasons. 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.
| Document | Code | Filed | At NHTSA |
|---|---|---|---|
| Opening resume | INOA | 2026 | |
| Filed document | INOV | 2026 | |
| Filed document | INDA | 2026 |
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 Aug 20, 2026, owners had filed 434 complaints with the agency about the model years above, of which 47 named the engine NHTSA went on to investigate. Owner complaints are the agency’s main early signal, and more can be filed while an action is open.
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 is open. Nothing is owed on the vehicle today; if it becomes a recall, owners are written to and the repair is free. The moment to know is the day the campaign number appears — Recall Watch checks each VIN against every new NHTSA campaign and emails you when one lands, or take a free one-line alert by model year.
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.
An investigation is not a recall. Yet.
If NHTSA’s questions become a recall, the campaign lands in the federal file first. Recall Watch checks your VINs against every new campaign the night it is filed.
Common questions
Source: NHTSA Office of Defects InvestigationIs DP26006 a recall?
No. A defect petition is NHTSA asking questions, not a recall. A safety recall carries an NHTSA campaign number and a duty to repair for free; this one has not produced one. Whether one particular vehicle has an open recall is a VIN question at nhtsa.gov/recalls.
Is DP26006 still open?
Yes, as of NHTSA’s latest file: opened Aug 20, 2026, 2 months ago.
Which vehicles does DP26006 cover?
NHTSA opened it on 3 model years: 2026 Toyota Grand Highlander, 2025 Toyota Grand Highlander, 2024 Toyota Grand Highlander. That is the scope of the inquiry, not a list of affected vehicles; a recall, if one follows, defines its own population by VIN.