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Home / DTC / B2829 — Communication error with Radio control module

B2829 — Communication error with Radio control module

Detailed page for trouble code B2829.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

B2829

HYUNDAI B — Body

Communication error with Radio control module

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

Causes

  • Faulty Radio Control Module (head unit)
  • Damaged or disconnected wiring harness or connector
  • Poor ground or battery voltage issues
  • Blown fuse or power supply problem to the radio
  • Fault or short on vehicle data bus (CAN, LIN or MOST)
  • Intermittent BCM / gateway module fault or software mismatch

Symptoms

  • No audio, display blank, or touchscreen unresponsive
  • Loss of radio, Bluetooth, navigation or phone functions
  • Radio shows error/warning, or repeatedly reboots
  • Other modules report loss of communication with radio
  • Related vehicle features (steering wheel audio controls) not working

What to check

  • Scan vehicle network with a capable diagnostic tool and read freeze frame/communication errors
  • Check battery voltage and charging system (stable 12V+ with engine off and running)
  • Inspect radio power and accessory fuses and relays
  • Visually inspect radio connector(s) for corrosion, bent pins, water intrusion or damage
  • Check radio and BCM ground connections for security and corrosion
  • Measure CAN bus voltages at the radio connector (CAN_H, CAN_L) and check termination resistance (~60 ohms across CAN_H–CAN_L)

Signal parameters

  • CAN bus recessive voltage: CAN_H ≈ 2.5V, CAN_L ≈ 2.5V (both equal when idle)
  • CAN bus dominant state: differential ~2.0V to 3.0V between CAN_H and CAN_L (e.g., CAN_H ~3.5V, CAN_L ~1.5V)
  • Termination resistance: ~60 ohms between CAN_H and CAN_L with ignition ON or key in accessory
  • LIN (if present): reference 0–12V pulses per protocol; check for expected message timing
  • MOST (optical) systems: verify optical ring continuity/power and no broken fibers (if vehicle uses MOST)
  • Audiovisual control power: battery/switch ignition feed and ground continuity

Diagnostic algorithm

  1. Start with a full scan: record B2829 and any other related codes (U0xxx, B28xx, U01xx). Note freeze-frame data and frequency of occurrence.
  2. Verify battery voltage is within spec (12.0–14.5V). Repair charging/battery issues first.
  3. Check fuses and relays for radio power/ignition/accessory circuits; replace if blown.
  4. Inspect radio connectors for damage, corrosion or water; disconnect and reseat connectors. Check for bent pins.
  5. Check ground strap at radio and nearby chassis ground; clean and tighten as needed.
  6. With a multimeter/oscilloscope measure CAN_H and CAN_L at the radio connector: confirm recessive voltages (~2.5V) and proper differential when bus is active. Measure termination resistance ≈60Ω across CAN lines. Repair wiring faults or shorts.
  7. If vehicle uses MOST or optical bus for audio, inspect optical connectors and ring for signal present; replace broken fiber or connectors.
  8. Perform wiggle/scan tests: wiggle harness while monitoring live bus messages to attempt to reproduce intermittent faults.
  9. If wiring and power are good, try swapping in a known-good radio (if available) or bench-testing the suspect unit to confirm module failure.
  10. Check for and install any OEM software/firmware updates for the radio and gateway/BCM. Re-flash or reprogram modules as required.
  11. After repairs, clear codes and road-test while monitoring network for recurrence. If code returns, escalate to module-level diagnostics or dealer-level tools.

Likely causes

  • Radio module internal electronics failure
  • Loose or corroded connector at radio or body control module (BCM)
  • Open/short in CAN High or CAN Low wiring near radio
  • Blown radio power or accessory fuse
  • Ground strap/cable at radio or chassis is corroded or loose
  • Incompatible or corrupted radio software/firmware after replacement

Fault status

⚠️ Status
Communication fault detected between Radio Control Module and vehicle network (CAN/MOST/LIN). Messages from the radio module are missing or corrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2828 B2830 B2840 U0100 U0073 U1000
371

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

HYUNDAI

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Code

B2829

LAND ROVER B — Body

Passive Keyless Entry antenna circuit fault

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

Causes

  • Faulty Radio Control Module (head unit)
  • Damaged or disconnected wiring harness or connector
  • Poor ground or battery voltage issues
  • Blown fuse or power supply problem to the radio
  • Fault or short on vehicle data bus (CAN, LIN or MOST)
  • Intermittent BCM / gateway module fault or software mismatch

Symptoms

  • No audio, display blank, or touchscreen unresponsive
  • Loss of radio, Bluetooth, navigation or phone functions
  • Radio shows error/warning, or repeatedly reboots
  • Other modules report loss of communication with radio
  • Related vehicle features (steering wheel audio controls) not working

What to check

  • Scan vehicle network with a capable diagnostic tool and read freeze frame/communication errors
  • Check battery voltage and charging system (stable 12V+ with engine off and running)
  • Inspect radio power and accessory fuses and relays
  • Visually inspect radio connector(s) for corrosion, bent pins, water intrusion or damage
  • Check radio and BCM ground connections for security and corrosion
  • Measure CAN bus voltages at the radio connector (CAN_H, CAN_L) and check termination resistance (~60 ohms across CAN_H–CAN_L)

Signal parameters

  • CAN bus recessive voltage: CAN_H ≈ 2.5V, CAN_L ≈ 2.5V (both equal when idle)
  • CAN bus dominant state: differential ~2.0V to 3.0V between CAN_H and CAN_L (e.g., CAN_H ~3.5V, CAN_L ~1.5V)
  • Termination resistance: ~60 ohms between CAN_H and CAN_L with ignition ON or key in accessory
  • LIN (if present): reference 0–12V pulses per protocol; check for expected message timing
  • MOST (optical) systems: verify optical ring continuity/power and no broken fibers (if vehicle uses MOST)
  • Audiovisual control power: battery/switch ignition feed and ground continuity

Diagnostic algorithm

  1. Start with a full scan: record B2829 and any other related codes (U0xxx, B28xx, U01xx). Note freeze-frame data and frequency of occurrence.
  2. Verify battery voltage is within spec (12.0–14.5V). Repair charging/battery issues first.
  3. Check fuses and relays for radio power/ignition/accessory circuits; replace if blown.
  4. Inspect radio connectors for damage, corrosion or water; disconnect and reseat connectors. Check for bent pins.
  5. Check ground strap at radio and nearby chassis ground; clean and tighten as needed.
  6. With a multimeter/oscilloscope measure CAN_H and CAN_L at the radio connector: confirm recessive voltages (~2.5V) and proper differential when bus is active. Measure termination resistance ≈60Ω across CAN lines. Repair wiring faults or shorts.
  7. If vehicle uses MOST or optical bus for audio, inspect optical connectors and ring for signal present; replace broken fiber or connectors.
  8. Perform wiggle/scan tests: wiggle harness while monitoring live bus messages to attempt to reproduce intermittent faults.
  9. If wiring and power are good, try swapping in a known-good radio (if available) or bench-testing the suspect unit to confirm module failure.
  10. Check for and install any OEM software/firmware updates for the radio and gateway/BCM. Re-flash or reprogram modules as required.
  11. After repairs, clear codes and road-test while monitoring network for recurrence. If code returns, escalate to module-level diagnostics or dealer-level tools.

Likely causes

  • Radio module internal electronics failure
  • Loose or corroded connector at radio or body control module (BCM)
  • Open/short in CAN High or CAN Low wiring near radio
  • Blown radio power or accessory fuse
  • Ground strap/cable at radio or chassis is corroded or loose
  • Incompatible or corrupted radio software/firmware after replacement

Fault status

⚠️ Status
Communication fault detected between Radio Control Module and vehicle network (CAN/MOST/LIN). Messages from the radio module are missing or corrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2828 B2830 B2840 U0100 U0073 U1000
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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