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Home / DTC / B294900 — Radio Antenna Connection & Receive Quality

B294900 — Radio Antenna Connection & Receive Quality

Detailed page for trouble code B294900.

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Code

B294900

HYUNDAI B — Body

Radio Antenna Connection & Receive Quality

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loose or corroded antenna connector(s)
  • Damaged or cut coaxial cable
  • Failed antenna amplifier (active antenna)
  • Bad ground or missing power feed to antenna amplifier
  • Physical damage or corrosion to antenna mast/assembly
  • Water intrusion at connectors or antenna base

Symptoms

  • Weak or no AM/FM reception on one or more bands
  • Intermittent radio reception, dropouts or static
  • Station seek/scan fails or misses stations
  • Audio/navigation unit displays antenna or reception warning/message
  • Reception improves when repositioning antenna or touching connectors

What to check

  • Read and record all related radio/AVN/body module DTCs and freeze-frame data
  • Visually inspect antenna mast/assembly for damage, looseness and corrosion
  • Inspect coax connectors at the antenna and at the radio for corrosion, water or bent pins
  • Check fuses related to radio/antenna amplifier and verify power/ground at the antenna amplifier feed
  • Wiggle-test coax and connectors while monitoring reception to reproduce fault
  • Disconnect antenna connector and inspect center conductor and shield for corrosion or breaks

Signal parameters

  • Antenna amplifier supply voltage (when radio on): typically ~11–14 V (verify vehicle spec)
  • Antenna control signal: ON/OFF control (0 V or battery voltage depending on design)
  • Connector continuity: coax center continuity between antenna and head unit (should be continuous; no open)
  • Coax shield continuity: verify shield not shorted to center conductor (no short)
  • RF signal strength: reduced relative to known-good reference (requires RF test equipment)

Diagnostic algorithm

  1. Scan audio/AVN and body domains for related DTCs; note any communication faults and clear codes if needed.
  2. Visually inspect antenna and base for damage, corrosion or water ingress; repair or replace as required.
  3. Verify fuses and measure voltage at antenna amplifier power feed with radio ON. If no voltage, trace back wiring, connectors and module outputs.
  4. Disconnect antenna connector at head unit and inspect pins; check continuity of coax center conductor and shield back to head unit.
  5. Wiggle coax and connectors while monitoring reception to detect intermittent opens or shorts.
  6. If vehicle uses an active amplifier, bench-test or substitute a known-good amplifier or head unit to isolate component.
  7. Check module grounds and ground points near antenna and head unit; clean and secure as needed.
  8. Inspect for aftermarket devices or RF noise sources that could affect reception; remove or relocate to test.
  9. If wiring and antenna check good, update radio/AVN software if available and consider module replacement following manufacturer diagnostics.
  10. After repairs, clear DTCs and road-test to verify stable reception and that the code does not return.

Likely causes

  • Corroded/loose antenna connector at antenna or AVN unit
  • Broken or pinched coaxial lead between antenna and radio
  • Failed inline antenna amplifier (common on vehicles with power masts or shark-fins)
  • No power supply to the antenna amplifier (blown fuse, open feed, bad ground)

Fault status

⚠️ Status
B294900 — Radio antenna connection and receive quality fault. The audio/navigation control module detected poor or lost antenna signal quality or a fault in the antenna circuit (connectors, coax, amplifier, power/ground or related module).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0140
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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