U0549Invalid Data Received From Remote Accessory Module
- Generic OBD-II code · Network
- How the car detects it
- No manufacturer explains in public what the remote accessory module is; the term shows up only in code lists, together with its lost-communication partner U0248. Going by the name, it is a body-side unit controlling accessories away from the main controllers, and it is distinct from the accessory protocol interface module covered by U0554. GM's Saab 9-5 documentation describes the supervision behind such codes: receivers watch for expected signals, substitute defaults when a signal is not valid and set a code against the sender, and its code list splits invalid data into subtypes such as wrong message counter, checksum error or implausible value. U0549 follows that scheme for this module. What stops working depends on the vehicle; driving is not affected.
- What you may notice
- An accessory function controlled by this module does not work
- Code stored without noticeable effect
- Likely causes
- PossibleRemote accessory module internally faulty
- PossibleRetrofitted or upfitter equipment disturbing the module's data
- RareLow battery voltage or power interruption while the module was active
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.