Law enforcement sources tell TMZ ... cops got a call back on Nov. 6 about a man causing a disturbance inside a motorhome, and when they got there they made contact with Chico and noticed his RV had an expired registration of over 6 months.

We're told police impounded the vehicle and officers allegedly found methamphetamine and drug paraphernalia inside the ride.

The DeBarge singer was then arrested and booked for possession of a controlled substance and possession of drug paraphernalia ... and he was later released from custody on a promise to appear citation.

Chico's admittedly struggled with addiction for years, and he's been arrested 3 other times -- in 2007, late 2019 and early 2021 -- for drug possession.

As we first told you ... during the last drug bust, cops say Chico ID'd himself as James, his older brother from the family singing group, before being properly ID'd during the booking process.