Senior inspector Walter Ebora, Alaminos police chief, said charges of illegal possession of explosives have been filed against the three Indians, Inquirer.net reported.
He said the suspects underwent inquest proceedings earlier in the day.
Chief superintendent Benito Estipona, Calabarzon police regional director, said the three took the Toyota Avanza for engine oil replacement at a repair shop along Maharlika Highway in Barangay village and left it a few minutes later.
Later, a mechanic discovered the IED under the engine of the vehicle.
Some reports said the bomb was made from military-grade C4 explosives rigged to a mobile phone as a trigger device.
"The mobile phone's battery ran out, that's why the device didn't explode," police said.
Authorities have yet to determine the motive behind the incident.