Code
B298300
HYUNDAI
B — Body
HD Module SDIO Communication Error C Codes
Views:
UK: 5
EN: 19
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty or improperly seated SD card or SDIO peripheral
- Corroded, damaged or loose connector/pins between HD module and SDIO device
- Broken or shorted wiring harness (power, ground or data lines)
- Failed HD module SDIO interface or peripheral device
- Software/firmware incompatibility or corruption
- EMI (electromagnetic interference) or poor grounding causing signal disruption
Symptoms
- Malfunctioning infotainment/navigation or media playback
- ‘SD card error’ or related message on screen
- Intermittent reboots or freezes of the HD/head unit
- Stored B298300 (SDIO communication error) and related communication DTCs
- Loss of map data, music, or telematics functions that rely on SDIO device
- Possible degraded features that depend on HD module communications
What to check
- Scan all modules and record freeze frame data and full DTC history
- Visually inspect SD card, card slot and mating connector for corrosion, debris or bent pins
- Verify battery voltage and ground integrity at the HD module (no low-voltage conditions)
- Check related connectors for proper engagement and locking tabs
- Inspect wiring harness for chafing, breaks, or signs of water ingress near the SDIO device and HD module
- Confirm software/firmware levels for HD module and SDIO peripheral against dealer/service information
Signal parameters
- SDIO power rail (VCC, typically 3.3 V) and ground presence
- SDIO clock (CLK) activity when device is active
- SDIO command (CMD) line toggling during transactions
- SDIO data lines (DAT0–DAT3) activity and proper voltage levels
- Expected clock frequency range for SDIO (depends on device; verify service manual)
- Absence of excessive noise or level shifting on SDIO lines
Diagnostic algorithm
- Read and record the full failure record and related DTCs using a capable scan tool. Check manufacturer service notes for B298300 specifics.
- Confirm battery voltage is within specification and check HD module ground connections.
- Visually inspect SD card and slot; remove and reseat the SD card. If removable, try a known-good replacement SD card.
- Inspect and disconnect/reconnect all related connectors (HD module, SDIO peripheral). Look for bent pins, corrosion, or water contamination.
- With connectors disconnected, perform continuity tests on power, ground and key SDIO lines per wiring diagram. Repair any open/shorts found.
- With the system powered, probe SDIO CLK/CMD/DAT lines with an oscilloscope or logic analyzer while attempting device access to verify clock and data activity and signal integrity.
- Check for firmware updates or software reflash procedures for the HD module and SDIO device; apply updates if available.
- If wiring, connectors and peripheral card are good but errors persist, consider swapping the HD module or SDIO peripheral (if serviceable) to isolate faulty hardware.
- After repairs, clear DTCs, perform function tests (media/navigation/telemetry) and road test to confirm issue resolution. Re-scan for reoccurrence and verify no new codes appear.
Likely causes
- Loose/dirty SD card or damaged SD card slot
- Damaged wiring or connector between HD module and SDIO device
- Failed SD card or SDIO peripheral (media, modem, navigation unit)
- HD module firmware bug or corrupted module memory
- Failed HD module SDIO interface
Fault status
Status
HD module logged SDIO communication error (C codes). Peripheral access may be intermittent or lost; related infotainment/navigation features may be unavailable.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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