U0515 code meaning
Invalid Data Received From Remote Function Actuation Module
What U0515 means
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.
U0515 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0515
- 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
Common causes of U0515
- Most likelyModule software hanging or outdated, e.g. after an over-the-air update
- PossibleChafed or pinched data wire to the receiver module in the roof area
- PossibleSupply interruption or internal fault of the receiver module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Remote function module
What each part of U0515 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 15 | The exact fault in that area. |
What to do next
- Note U0515 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0515
What does U0515 mean?
U0515 means "Invalid Data Received From Remote Function Actuation Module". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U0515?
U0515 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0515 fail an emissions test?
U0515 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0515 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U0515 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.