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Home / DTC / U05B8 — Invalid Data Received From Rear Radar Module B

U05B8 — Invalid Data Received From Rear Radar Module B

Detailed page for trouble code U05B8.

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U05B8

Generic U — Network/User

Invalid Data Received From Rear Radar Module B

Brand: Generic
Type: U — Network/User
Views: UK: 11 EN: 23 RU: 17
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Page language: EN

Causes

  • Faulty Rear Radar Module B (internal electronics or firmware)
  • Corroded, loose or damaged connector at the radar or control module
  • Open/shorted or intermittent CAN / LIN / data-bus wiring between the module and network gateway
  • Poor or intermittent power or ground to the radar module
  • Module in bus-off or unsupported state due to network errors
  • Software/firmware mismatch or corrupted module software

Symptoms

  • ADAS warnings or fault indicator related to rear radar (e.g., blind-spot, cross-traffic, adaptive cruise rear functions disabled)
  • DTC U05B8 logged and possibly other communication-related U-codes
  • Intermittent or total loss of rear radar functions
  • False detections or phantom alerts from rear radar features
  • Reduced vehicle safety features that depend on rear radar data

What to check

  • Read and record all stored/active codes and freeze-frame data with a capable OEM-level scan tool
  • Check for related communication codes (other U-codes) that indicate network-wide issues
  • Inspect the rear radar physical mounting area for damage, contamination, or water ingress
  • Visually inspect connectors, terminals and wiring for corrosion, bent pins, or loose latch
  • Verify vehicle battery voltage at key-on and cranking (low voltage can corrupt module comms)
  • Check module power and ground pins for correct voltages and good continuity to chassis

Signal parameters

  • Message presence: periodic CAN/LIN messages from Rear Radar Module B should be present when system is on (typical frequency ~5–20 Hz depending on function and OEM)
  • CAN bus physical levels: recessive ~2.5 V, dominant CANH/CANL differential ≈2.0 V (manufacturer dependent)
  • Bus termination: ~120 ohm per end -> ~60 ohm measured across CANH–CANL
  • Expected data fields (manufacturer-specific): object ID, range (typical short-range 0.1–50 m; long-range up to ≈200 m), relative speed, angle, signal quality/SNR, status bits
  • Data integrity: checksum/CRC or message counter must be valid; reserved fields should be zero/defined per spec
  • Error indicators: repeated checksum failures, invalid values (NaN, out-of-range numbers), or constant reserved/invalid status flags

Diagnostic algorithm

  1. Connect a diagnostic scan tool and read all stored and pending DTCs; save freeze-frame and live data recorded when the code set.
  2. Clear codes and attempt to reproduce the fault by cycling ignition and operating systems that use the rear radar (e.g., enable reverse, blind-spot, cross-traffic or adaptive cruise features).
  3. Inspect the radar sensor, bracket and lens for contamination, damage or water ingress. Clean and dry the sensor, then test again.
  4. Visually inspect the sensor connector and wiring harness for corrosion, damaged insulation, broken strands, or unsecured routing. Wiggle test while watching live data to check for intermittent faults.
  5. Measure battery voltage and verify stable supply to the radar module power pin(s) with key on and with the system active. Check ground continuity to chassis.
  6. Verify CAN/LIN wiring continuity between the radar connector and the gateway/module using a multimeter; check for short to battery or ground.
  7. Use a CAN bus analyzer or oscilloscope to confirm presence of the radar module’s messages, correct voltage waveforms, expected message frequency, and absence of excessive error frames or bus-off conditions.
  8. Check termination resistors and bus impedance; repair any open or incorrect termination.
  9. If the radar messages are present but fields show invalid values or checksum errors, try power-cycle and module reset. Check for available software/firmware updates for the radar or network gateway.
  10. Inspect other modules on the same CAN network for bus errors or symptoms; isolate the segment if necessary to see if the condition follows the radar or the wiring/gateway.
  11. If wiring and network are confirmed good and messages remain corrupted or absent, replace or bench-test Rear Radar Module B per manufacturer procedures. After replacement, perform required module programming and sensor calibration.
  12. After repair, clear codes and perform a functional test and road test to confirm system operation; re-check for any re-appearing communication codes.

Likely causes

  • Intermittent or failed CAN wiring/connectors between Rear Radar Module B and vehicle gateway
  • Failed radar module (hardware or firmware) producing corrupted messages
  • Loss of proper power/ground to the sensor causing unstable data
  • CAN bus errors (bus-off or too many retransmissions) preventing valid messages
  • Connector corrosion or water intrusion at the sensor harness

Fault status

⚠️ Status
Invalid data received from Rear Radar Module B — communication or data integrity fault (checksum/format/status invalid or messages missing).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U05B0 U05B9 U0100 U0073 U1000 U0420
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