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Home / DTC / U1702 — DTCP Sink Decode error.

U1702 — DTCP Sink Decode error.

Detailed page for trouble code U1702.

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Code

U1702

HYUNDAI U — Network/User

DTCP Sink Decode error.

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

Causes

  • Corrupted or incomplete encrypted media stream
  • DTCP key/certificate or authentication data missing or invalid
  • Incompatible DTCP protocol/firmware versions between sender and sink
  • Faulty infotainment head unit, display module, or media source
  • Damaged or intermittent digital video/audio wiring or connectors (LVDS, HDMI, MHL, USB)
  • Software/firmware bug in either source or sink module

Symptoms

  • Protected video/audio fails to play or is blocked
  • Black screen, frozen image, or error message related to content protection
  • Intermittent loss of multimedia during streaming or playback
  • Related U‑codes or network communication errors logged
  • Certain sources (Blu‑ray, streaming apps, phone mirroring) fail while others work

What to check

  • Read and record U1702 and any other related DTCs from all infotainment and display modules
  • Attempt to reproduce the failure with the same source, and with a known‑good source
  • Verify infotainment and display firmware/software versions and compare to manufacturer bulletin
  • Inspect connectors and cabling for LVDS/HDMI/USB/MHL between modules; check for corrosion, damage, or loose pins
  • Verify head unit accessory power (+12V), ignition switched power, and ground connections
  • Scan vehicle network (CAN/ethernet) for missing or repeating multimedia handshake messages

Signal parameters

  • CAN/automotive Ethernet: relevant multimedia message IDs present and toggling during handshake
  • Head unit power rails: accessory +12V present and stable, ground continuity confirmed
  • Digital video link (LVDS/HDMI/MHL): video clock and data lanes active during playback attempt
  • DTCP handshake exchange: authentication request/response sequence visible (protocol‑level traces if available)
  • Error counters: CRC/frame errors on digital link, message retransmits on network

Diagnostic algorithm

  1. Capture and record the U1702 event details (time, freeze frame, related codes).
  2. Reproduce the symptom: attempt protected content playback from the reported source and from a known‑good source to confirm scope.
  3. Check for related network U‑codes (lost communication or authentication failures) and address any bus communication faults first.
  4. Inspect and reseat connectors and cables between head unit, display and any external interfaces. Repair or replace visibly damaged harnesses.
  5. Verify module software/firmware levels against manufacturer data; if outdated or known‑buggy, perform a controlled update per OEM procedure.
  6. If accessible, verify DTCP key/certificate presence and integrity; restore or reinitialize key store per OEM procedure.
  7. Monitor digital video link signals (oscilloscope or protocol analyzer) to confirm clock/data presence and check for excessive errors.
  8. Test with a known‑good source device or a replacement head unit/display to isolate sender vs sink fault.
  9. If module hardware appears faulty or decode engine fails despite correct software and wiring, consult OEM technical service information and consider module replacement.
  10. After repairs/software actions, clear DTCs and recheck for recurrence under the same test conditions.

Likely causes

  • Infotainment or display module firmware update introduced mismatch
  • Failed or corrupted DTCP key store in the head unit or display
  • Intermittent wiring/connector fault on digital video link
  • External device (phone, media player) not supporting required DTCP version
  • Module hardware degradation (processor, crypto engine) preventing decode

Fault status

⚠️ Status
DTCP sink decode failure — content protection handshake or decryption failed; protected media playback blocked.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

U1700 U1701 U1703 U0121 U1101
371

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