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Home / DTC / U0515 — Invalid Data Received From Remote Function Actuation

U0515 — Invalid Data Received From Remote Function Actuation

Detailed page for trouble code U0515.

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U0515

HYUNDAI U — Network/User

Invalid Data Received From Remote Function Actuation

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted or out-of-spec CAN/LIN messages from the Remote Function Actuation module
  • Poor network physical layer: damaged wiring, corroded connectors, shorts to power or ground
  • Module ground or supply voltage faults causing bad transmissions
  • Software mismatch or corrupted calibration in the sending or receiving module
  • Aftermarket alarm/keyless/remote start equipment interfering with messages
  • Intermittent module hardware failure or water intrusion in connectors

Symptoms

  • Remote keyless functions (lock/unlock, remote start) fail or work intermittently
  • Door locks/alarms or remote-start may not respond or operate unpredictably
  • One or more control modules report communication warnings or DTCs
  • Instrument cluster or HVAC may show related messages/errors
  • Possible vehicle security/immobilizer warnings or no-start conditions in some models

What to check

  • Read all U-codes and related freeze-frame data with a manufacturer-level scan tool
  • Check for other related codes (body control, immobilizer, CAN bus errors) and note time stamps
  • Verify vehicle battery voltage and charging system; inspect module power and ground circuits
  • Visually inspect wiring and connectors at the Remote Function Actuation module and BCM for damage, corrosion, or water intrusion
  • Disconnect any aftermarket remote, alarm, or remote-start modules and retest
  • Perform a network scan to confirm presence of the remote module on the bus (node alive) using OEM tool

Signal parameters

  • Bus type (CAN or LIN) and nominal baud rate (model dependent, commonly 250/500 kbps for CAN)
  • Node presence/alive messages for the Remote Function Actuation module (message ID varies by model)
  • Message cycle time / frequency and data length code (DLC) for remote actuation frames
  • Expected command/data field ranges (lock/unlock codes, button identifiers) — compare against captured payload
  • Bus voltage levels (CANH/CANL differential) and noise/spikes on the network
  • Error counters for CAN controllers (TX/RX error counts), if available

Diagnostic algorithm

  1. Connect a capable OEM or professional scan tool. Read and record all stored and pending DTCs and freeze-frame data.
  2. Check vehicle battery voltage and module supply/ground at rest and while operating. Repair any low or unstable supply/ground first.
  3. Inspect connectors and wiring at the Remote Function Actuation module and Body Control Module (BCM) for corrosion, bent pins, water, or damage; repair as needed.
  4. If aftermarket remote/alarm/remote-start systems are present, disconnect them and re-test to eliminate interference as the cause.
  5. Use the scan tool to verify the remote module is present on the network and can be polled or to request its status. Note any communication timeouts.
  6. While reproducing the symptom (press remote button, use remote start), monitor the network traffic. Capture the frame identified by the module and compare DLC, data bytes and timing to expected values or to a good vehicle if available.
  7. If physical-layer issues are suspected, measure CANH/CANL voltages and check termination resistances (approx. 60 ohms between CANH and CANL when power off, model dependent). Use an oscilloscope to look for noise, missing recessive/dominant states, or corrupted frames.
  8. If the module is present but sending invalid data, attempt software/firmware reflash or update per OEM service procedure. Clear codes and recheck.
  9. If the module fails to respond correctly after wiring and software checks, replace the remote function/BCM module following OEM replacement and programming procedures.
  10. After any repair, clear codes and perform a full system test to confirm the fault does not return.

Likely causes

  • Loose/corroded connector or damaged harness at the remote actuator or body control module
  • Weak or intermittent module supply/ground causing invalid frames
  • Aftermarket remote-start or security equipment sending unexpected frames
  • Module needs reflash/update due to software incompatibility
  • Faulty Remote Function Actuation module (internal hardware failure)

Fault status

⚠️ Status
U0515 - Invalid Data Received From Remote Function Actuation: The receiving control module detected data or a message format from the Remote Function Actuation subsystem that is out of expected specification or corrupted. Investigate communication integrity, power/ground, wiring, and module software.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

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U0100 U0140 U0155 U0299 U0401
371

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