Code
B2809
HYUNDAI
B — Body
No Response NM Message (RRC)
Views:
UK: 10
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty RRC (rear-right) module
- Broken, corroded or loose connector at RRC
- Open or short in the CAN/NM wiring (CAN High, CAN Low, or power/ground)
- Blown fuse or failed power/ground supply to RRC
- Other module on same bus pulling down communications
- Intermittent wiring damage (pinch, water intrusion)
Symptoms
- Malfunction or loss of the specific rear-right functions controlled by RRC (e.g., door lock/window/mirror/lighting)
- One or more communication-related DTCs present (communication timeouts)
- Malfunction Indicator Lamp or warning messages related to body electronics
- Intermittent or permanent loss of control for components at the rear right corner
What to check
- Obtain full DTC report with a capable scan tool; note other network codes present
- Confirm vehicle application and identify the RRC module location using service manual/wiring diagrams
- Visually inspect RRC connector and harness for corrosion, bent pins, damage or water intrusion
- Check fuses/relays powering the RRC module
- With ignition ON, verify module presence on scan tool (can it be queried?)
- Measure battery voltage at RRC power pin (should be ~11–14.5 V with ignition ON)
Signal parameters
- Module supply voltage: ~11–14.5 V with ignition ON
- Ground:
- CAN bus idle (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V (differential ≈ 0 V)
- CAN bus dominant: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V)
- CAN bus termination: nominal ≈ 120 Ω across CANH–CANL (measured with power off)
- No response/time-out from module when polled by scan tool
Diagnostic algorithm
- Connect professional scan tool; read and record all DTCs and freeze frame data. Note ignition cycle state when code set.
- Attempt to communicate with RRC via scan tool. If module communicates intermittently, suspect wiring/connector issues.
- Visually inspect RRC connector and harness; repair any corrosion, bent pins or damaged insulation. Reseal or replace connector if water intrusion found.
- Check related fuses and power feeds; verify battery voltage at the module power pin with ignition ON.
- Check ground continuity from RRC ground to chassis/negative battery. Secure or repair ground as necessary.
- Measure CANH/CANL voltages at the RRC connector with ignition ON. Compare idle and dominant voltages to expected values in signal_params.
- If CAN lines show abnormal voltages or bus off, isolate by disconnecting the RRC connector and re-measuring bus at an upstream point to find shorted/loaded segment.
- If wiring checks normal and power/ground/CAN are correct but module still does not respond, try software wake or reprogramming per service instructions (check for Technical Service Bulletins).
- If module cannot be woken or reprogrammed and wiring is verified good, replace the RRC module and reprogram/configure as required. Clear codes and road-test to confirm.
- After repairs, clear DTCs, perform full system communication check and verify normal operation of rear-right functions. Monitor for recurrence.
Likely causes
- No battery power or ground at RRC
- Damaged or disconnected CAN bus wiring to RRC
- Faulty RRC module
- Intermittent connector corrosion or water ingress
Fault status
Status
No response to Network Management message from RRC module — communication timeout/absence.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
B2809
LAND ROVER
B — Body
Pressure sensor power supply - short circuit to ground
Views:
UK: 4
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Faulty RRC (rear-right) module
- Broken, corroded or loose connector at RRC
- Open or short in the CAN/NM wiring (CAN High, CAN Low, or power/ground)
- Blown fuse or failed power/ground supply to RRC
- Other module on same bus pulling down communications
- Intermittent wiring damage (pinch, water intrusion)
Symptoms
- Malfunction or loss of the specific rear-right functions controlled by RRC (e.g., door lock/window/mirror/lighting)
- One or more communication-related DTCs present (communication timeouts)
- Malfunction Indicator Lamp or warning messages related to body electronics
- Intermittent or permanent loss of control for components at the rear right corner
What to check
- Obtain full DTC report with a capable scan tool; note other network codes present
- Confirm vehicle application and identify the RRC module location using service manual/wiring diagrams
- Visually inspect RRC connector and harness for corrosion, bent pins, damage or water intrusion
- Check fuses/relays powering the RRC module
- With ignition ON, verify module presence on scan tool (can it be queried?)
- Measure battery voltage at RRC power pin (should be ~11–14.5 V with ignition ON)
Signal parameters
- Module supply voltage: ~11–14.5 V with ignition ON
- Ground:
- CAN bus idle (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V (differential ≈ 0 V)
- CAN bus dominant: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V)
- CAN bus termination: nominal ≈ 120 Ω across CANH–CANL (measured with power off)
- No response/time-out from module when polled by scan tool
Diagnostic algorithm
- Connect professional scan tool; read and record all DTCs and freeze frame data. Note ignition cycle state when code set.
- Attempt to communicate with RRC via scan tool. If module communicates intermittently, suspect wiring/connector issues.
- Visually inspect RRC connector and harness; repair any corrosion, bent pins or damaged insulation. Reseal or replace connector if water intrusion found.
- Check related fuses and power feeds; verify battery voltage at the module power pin with ignition ON.
- Check ground continuity from RRC ground to chassis/negative battery. Secure or repair ground as necessary.
- Measure CANH/CANL voltages at the RRC connector with ignition ON. Compare idle and dominant voltages to expected values in signal_params.
- If CAN lines show abnormal voltages or bus off, isolate by disconnecting the RRC connector and re-measuring bus at an upstream point to find shorted/loaded segment.
- If wiring checks normal and power/ground/CAN are correct but module still does not respond, try software wake or reprogramming per service instructions (check for Technical Service Bulletins).
- If module cannot be woken or reprogrammed and wiring is verified good, replace the RRC module and reprogram/configure as required. Clear codes and road-test to confirm.
- After repairs, clear DTCs, perform full system communication check and verify normal operation of rear-right functions. Monitor for recurrence.
Likely causes
- No battery power or ground at RRC
- Damaged or disconnected CAN bus wiring to RRC
- Faulty RRC module
- Intermittent connector corrosion or water ingress
Fault status
Status
No response to Network Management message from RRC module — communication timeout/absence.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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