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Home / DTC / B2807 — No Response NM Message (RSE_L)

B2807 — No Response NM Message (RSE_L)

Detailed page for trouble code B2807.

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Code

B2807

HYUNDAI B — Body

No Response NM Message (RSE_L)

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

Causes

  • RSE_L module not powered (blown fuse, open power feed, ignition condition)
  • Poor or open ground at RSE_L
  • Disconnected, corroded or damaged connector/wiring to RSE_L
  • Faulty RSE_L module (electronic failure)
  • CAN/LIN bus wiring fault (open, short to ground or battery, high resistance)
  • Gateway/BCM software/configuration issue or lost network node

Symptoms

  • Rear Left entertainment screen/audio not working or absent
  • Related infotainment features disabled for left rear seat
  • Communication-related warnings or loss-of-function messages on cluster or head unit
  • Other modules report a missing node or communication errors
  • Possible intermittent operation of rear-left functions

What to check

  • Use a diagnostic scanner to read stored/current DTCs and confirm B2807 details and freeze frame data
  • Verify vehicle battery voltage and that ignition is in the correct position for communication
  • Inspect RSE_L connector for corrosion, bent pins, water intrusion and secure engagement
  • Check fuses and power feed to the RSE_L module
  • Verify good ground(s) for the RSE_L module at the chassis/ground point
  • Scan the network to confirm if the module appears in the module list or if other nodes report it missing

Signal parameters

  • CAN bus idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
  • LIN bus idle: pulled to battery voltage through pull-up; dominant state near 0 V (depends on vehicle design)
  • NM (Network Management) frames: periodic heartbeat messages expected from module — typically repeat every few hundred milliseconds to a few seconds (varies by implementation)
  • Expected resistance across CAN_H and CAN_L with proper termination: ~60 ohms (two 120 ohm terminators in parallel)
  • Typical power feed at module: near battery voltage with ignition ON (verify against vehicle wiring diagram)

Diagnostic algorithm

  1. Confirm code with a capable diagnostic scanner and note module addressing, time of occurrence, and related codes.
  2. Check battery voltage and key-on position; many modules only awake in specific ignition states.
  3. Visually inspect RSE_L connector, harness, and nearby wiring for damage or corrosion; repair any obvious faults.
  4. Verify fuses and measure module power pin for battery voltage and ground pin for good continuity to chassis ground.
  5. Use scan tool to request the RSE_L module; if no response, determine whether other modules on the same bus are responding.
  6. Probe CAN/LIN wires for activity. Use a scope to view valid CAN differential signals or LIN frames. If no activity, isolate and test wiring back toward the gateway/BCM.
  7. Check for shorts: measure resistance to battery and ground on the network wires with battery disconnected. Repair any shorts or high-resistance connections.
  8. Wiggle-test harnesses while watching for intermittent comms to reproduce failures; repair or replace connectors/harness as required.
  9. If wiring, power and ground are good but the module still does not respond, attempt dealer-level software/firmware reflash or initialization per service procedures.
  10. If reflash fails or module remains non-responsive, replace the RSE_L module. After repair, clear codes and verify normal network communication and function.

Likely causes

  • Loose/damaged connector or wiring to RSE_L (most common)
  • Power or ground circuit fault at the RSE_L module
  • CAN or LIN bus open/short or missing termination
  • Failed RSE_L module
  • Gateway/BCM or software mismatch preventing NM message handling

Fault status

⚠️ Status
No response to Network Management (NM) messages from RSE_L detected. The gateway or BCM logged a timeout/missing node condition when the expected periodic NM frames from the left Rear Seat Entertainment module were not received.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B2800 B2806 B2810 U0100 U0073 U0121
371

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