The troubled mother of the “affluenza teen” — who used his wealthy upbringing as a defense for killing four people while driving drunk — is back in jail after failing a urine test.

Tonya Couch, 52, was jailed Friday in Fort Worth, Texas, after failing the test as part of her $75,000 bond that bars drugs, alcohol or any medication, records show.

It is the third time she has landed in jail for failed tests since her original arrest in December 2015 for helping her then-16-year-old son, Ethan Couch, flee to Mexico after his fatal 2013 crash.

Her current bond relates to charges of money laundering and hindering apprehension related to her son’s escape.

Couch’s crash sparked outrage after he used his wealthy upbringing as a defense for his crime, saying it impaired his ability to tell right from wrong.

He was released from jail last April after serving nearly two years at Tarrant County Jail for fleeing to Mexico.

Last month his GPS monitor was removed but he still has to comply with other conditions, including a curfew, alcohol monitor and substance abuse test patch, the Fort Worth Star-Telegram revealed.

With Post wires