President Donald Trump was away in Florida at the time.
However, security at the address was immediately upraded while the vehicle was checked.
The incident followed an earlier one Saturday near the White House.
"Due to the fact that this is an on-going criminal investigation, the Secret Service will not provide any further details at this time". Last May, a man named Jesse Olivieri from Pennsylvania brandished a firearm at a White House security checkpoint and was then shot and injured by the Secret Service before being detained.
The vehicle was stopped Saturday around 11:00 p.m. about a quarter-mile from the White House.
Separately, the Secret Service said on Friday a laptop was stolen from an agent's vehicle in New York City but that such agency-issued computers contain multiple layers of security and are not permitted to contain classified information. But, despite the fact that Secret Service personnel "increased their posture of readiness" based on whatever they considered to be off or unsafe about the man, authorities announced Sunday morning that there did not turn out to be a bomb or other weapon or risky device on the man or in his vehicle. "Great response by @SecretService", Spicer tweeted. "In accordance with proper protocols, Secret Service personnel increased their posture of readiness", they added.
The incidents come about a week after the Secret Service said a Bay Area man scaled a fence to get onto White House grounds.
'It was a troubled person, ' he said about the intruder, whom authorities later identified as Tran.
The Secret Service hasn't said what caused the vehicle to be considered suspicious.