According to Hamburg police, the 32-year-old victim suffered from shock and severe bruising on her arms and legs, after being found by on Sunday following a huge manhunt. The driver has been jailed.
Authorities say the incident started when the woman, who was taking a cab home from the city's Reeperbahn entertainment district, became concerned that the driver was taking a detour in order to charge her more money.
When she asked whether he was trying to drive the fare up, the driver became angry and hit her in the face before forcing her into the taxi's boot and locking it, according to police.
The woman called the emergency number on her mobile phone, but she only found after passers-by heard her cries and called authorities.
The man had apparently parked the cab outside his apartment north of Hamburg in Schleswig-Holstein, left the screaming woman in the trunk and went inside.