The SuperDraco engines power the capsule's launch abort system, which is created to propel astronauts away from the rocket in the case of a catastrophic launch failure.
In a statement, a SpaceX spokesperson confirmed there was a problem of some kind during tests of the spacecraft at Landing Zone 1, the former Launch Complex 13 at Cape Canaveral Air Force Station in Florida, but provided few details about the what happened.
But SpaceX and NASA are investigating the incident.
And it comes ahead of tests of the capsule's escape system, which is created to jettison the spacecraft away from its rocket in the event of an emergency.More news: NCAA Basketball: 2019 Las Vegas Invitational preview and predictions
The Crew Dragon successfully rendezvoused with the space station on March 8, during an uncrewed test launch.
A mysterious but apparently serious incident occurred Saturday in Cape Canaveral, Florida, involving the SpaceX capsule meant to carry American astronauts into space late this year, the private company and NASA announced.
In a statement, the company said the failure occurred as it was conducting "a series of engine tests".
Yesterday we talked a bit about a serious failure of the SpaceX Crew Dragon capsule during testing.
"The initial tests completed successfully but the final test resulted in an anomaly on the test stand", said SpaceX in a statement.More news: Liverpool's Alisson Sent Off For Handling Outside The Box Against Brighton
NASA administrator Jim Bridenstine said the agency will work with SpaceX to ensure the safety of the commercial crew program going forward.
It's not immediately clear just how this incident will affect SpaceX's timeline for launching crew. Under CCP, Boeing and SpaceX have been tasked with returning America's crewed spaceflight capability by providing crew rotation flights to and from the International Space Station. A crewed launch was supposed to take place as soon as July, but it seems likely the timeline will change for that as well. That Dragon was slated to be reused for the upcoming in-flight abort test.
SpaceX meant to fly that same rocket this summer in an in-flight abort test, SpaceNews said.
SpaceX's first crewed test flight is slated to launch in July with United States astronauts Doug Hurley and Bob Behnken.More news: The New 10.2 inch iPad is Just $249 this Black Friday