Seat Tarraco electronic parking brake issue

The symptoms you describe are quite common with electronic parking brake systems, particularly on VAG vehicles. A fault code scan is essential, pinpointing which caliper is throwing the error. Before condemning the motor, I would check the wiring harness and connections to the caliper. Corrosion or damage there can mimic a faulty motor. Have you checked the brake sensor?

Thanks for the quick response. I did check the wiring harness visually, but didn't do a continuity test. Is that something I can do with a standard multimeter, or do I need specific tools? Also, is there a specific brake sensor I should be looking for?

A standard multimeter will suffice for a continuity test; check for shorts to ground as well. The brake sensor I referred to is the one integrated into the caliper motor assembly; it provides feedback to the ECU regarding the parking brake position. If the wiring checks out, and the sensor reading is erratic or absent, the motor assembly is likely the cause. A workshop with VCDS or ODIS can confirm this and perform the necessary coding after replacing the caliper. Your estimated repair cost of 505€ seems reasonable, inclusive of parts and labour.

Thank you for confirming my suspicions and explaining the likely cause in detail. It's booked in at the workshop. They've quoted 505€, which seems in line with what you suggested. I'll post again once the repair is complete.