A bill being introduced in the legislature would require repair shops to give customers written estimates and the right to authorize work before it was done.
Repair shops would also have to ensure their final bill is within a certain range of the estimate.
Premier Greg Selinger says the range hasn't been determined, but he is eyeing 10 per cent as a limit.
The Consumers Association of Canada says it supports the changes because car owners deserve to be informed.
The government says customers who feel cheated will be able to file complaints, and repair shops who break the law will face fines.