Can I get a replacement ABS module for a 2015 Holden Captiva?

No, it shouldn’t be difficult at all. Plenty of online advertisers list the ABS module for this vehicle, including second-hand, reconditioned and brand new examples. Prices range from a few hundred dollars for a second-hand unit (that might have the same problems as the one you already have) to about $1300 for a reconditioned unit and up to $3000 for a brand new module.

Despite its patchy reputation, the Captiva sold well for holden (mainly on price) so there’s plenty of knowledge and spare parts out there for them in the repair industry. Don’t forget to try traditional auto parts stores, either, as these can sometimes be a better bet than an online seller, particularly if you need the part in a hurry.