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Home / DTC / U05BA — Invalid Data Received From Rear Radar Module D

U05BA — Invalid Data Received From Rear Radar Module D

Detailed page for trouble code U05BA.

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U05BA

Generic U — Network/User

Invalid Data Received From Rear Radar Module D

Brand: Generic
Type: U — Network/User
Views: UK: 13 EN: 18 RU: 12
AI status
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Page language: EN

Causes

  • Faulty rear radar module (Module D)
  • Intermittent or failed CAN/LIN communication between radar and gateway
  • Corroded/damaged connector or wiring (power, ground, CAN high/low)
  • Software/firmware mismatch or incomplete module programming
  • Water intrusion or physical damage to radar module
  • Faulty gateway/ECU interpreting radar messages

Symptoms

  • ADAS warnings or radar system fault message displayed
  • Features that rely on rear radar disabled (e.g., rear collision alert, cross-traffic alert, adaptive cruise in reverse)
  • Related DTCs present on gateway or other ECUs
  • Intermittent or permanent radar detection loss
  • Radar self-test failures or communication timeouts in scan tool

What to check

  • Retrieve freeze-frame and full DTC list from all modules with a capable scan tool; record mileage/time
  • Check for related U-codes on gateway, ABS, BCM, and other ADAS modules
  • Visually inspect the rear radar module, bracket and antenna area for damage or moisture
  • Inspect wiring harness and connector at the radar for corrosion, bent pins, water, or crushed wires
  • Verify radar module power and ground at the connector with key ON (compare to wiring diagram)
  • Check CAN/LIN bus continuity and resistance to other nodes; look for short to battery/ground

Signal parameters

  • Typical CAN message ID(s) for Rear Radar Module D (check vehicle-specific service data)
  • Message frequency/period (e.g., 10–100 Hz for target updates — verify service manual)
  • Expected payload elements: object ID, range, azimuth, relative speed, status/valid flags
  • CAN bus bit rate (commonly 500 kbps or 250 kbps depending on vehicle) — verify vehicle specification
  • Signal voltage levels: dominant and recessive bus voltages on CAN_H/CAN_L (compare to other nodes)
  • Checksum/CRC and sequence counter present in radar messages (verify correct incrementing)

Diagnostic algorithm

  1. Confirm DTC with a vehicle scan tool; note freeze frame, occurrence count and related codes from gateway and other modules.
  2. Inspect the rear radar module area and connector for corrosion, damage, moisture, or loose mounting causing connector stress.
  3. With ignition ON, verify module supply voltage and ground at the radar connector per wiring diagram. Repair any open/low circuits.
  4. Check CAN bus physical layer: measure CAN_H and CAN_L voltages, check bus termination resistances, and use a scope or known-good CAN logger to observe message traffic. Compare to a good node.
  5. If messages are present but malformed (bad checksum, invalid sequence), capture and compare a sample to expected format from service literature; check for electrical noise sources nearby.
  6. Inspect and wiggle-test harness while monitoring bus for intermittent faults; repair or replace damaged wiring or connector pins.
  7. Verify module software/firmware and calibration status. If module was recently replaced, ensure correct programming and VIN adaptation per manufacturer procedure.
  8. If wiring and tool data indicate the radar module is not transmitting or is transmitting invalid frames, replace the radar module or related ECU only after confirming wiring and power/ground are good.
  9. After repairs or module replacement, reprogram/configure module if required, clear DTCs, and perform self-tests and a functional road test to confirm codes do not return.
  10. If intermittent network problems persist after module replacement, inspect gateway and other nodes for bus driver faults and consider scope-based network fault isolation.

Likely causes

  • Poor connector pin contact at radar harness or ground
  • CAN bus short or open near rear radar
  • Radar module firmware incompatible after module replacement
  • Loss of module supply voltage or ground fault causing corrupted messages

Fault status

⚠️ Status
Invalid or malformed data received from Rear Radar Module D over vehicle network. ADAS features relying on this radar may be limited or disabled until the communication fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0415 U0423 U0140 U0121 U1000
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