Network, generic

U0515 Invalid Data Received From Remote Function Actuation Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The remote function actuation module picks up the radio signals of key fobs and, on newer vehicles, of a phone used as a key, and hands lock, unlock, liftgate or remote start requests to the body controller. U0515 means its messages reach the network but fail the receiver's checks. Ford calls the unit RFA: on the Mustang Mach-E of model years 2021–2023 (SSM 51571, following an OTA software push) and the Lincoln Nautilus (SSM 54773) an RFA stuck in programming mode switched off the phone key function and left partner code U0214 in several modules; pulling the RFA fuse for a minute and reflashing with FDRS restored it. GM's bulletin 15-NA-004 lists U0214 on 2013–2016 Acadia where the keyless receiver's data line on the low-speed LAN got trapped by the rear HVAC duct. Fob, passive entry or phone key may then work erratically.

Likely causes

Module software hanging or outdated, e.g. after an over-the-air update
Chafed or pinched data wire to the receiver module in the roof area
Supply interruption or internal fault of the receiver module

Symptoms

  • Key fob or phone-as-a-key not working or only intermittently
  • Passive entry or remote start unavailable
  • Network codes stored in several body modules at the same time

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–450
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

remote function module

Related codes

U0214

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, en.wikipedia.org.