Hwy. 401 WB in Oshawa closed after multi-vehicle crash, diesel spill

Crews clean up after a crash caused a diesel spill on Hwy. 401 in Oshawa on Wednesday, April 29, 2026. OPP

Posted April 29, 2026 11:30 am.

Last Updated April 29, 2026 2:29 pm.

Ontario Provincial Police (OPP) officers say they’ve closed all westbound lanes of Highway 401 at Courtice Road in Oshawa after a multi-vehicle crash that resulted in a diesel spill.

The crash, involving three vehicles, happened at Harmony Road at around 9:12 a.m.

One driver has been taken to the hospital with minor injuries.

One of the vehicles involved was a commercial truck that had spilled diesel across all lanes.

The highway was closed at Courtice Road for a cleanup before reopening just before 2 p.m.

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