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Home / DTC / U05B7 — Invalid Data Received From Rear Radar Module A

U05B7 — Invalid Data Received From Rear Radar Module A

Detailed page for trouble code U05B7.

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U05B7

Generic U — Network/User

Invalid Data Received From Rear Radar Module A

Brand: Generic
Type: U — Network/User
Views: UK: 9 EN: 14 RU: 11
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Page language: EN

Causes

  • Faulty rear radar module (hardware or internal software fault)
  • Intermittent or failed power supply or ground at the radar module
  • Damaged, corroded, or loose connector or wiring between module and network
  • CAN bus wiring fault (short to battery/ground, high resistance, missing termination)
  • Network interference or excessive bus error frames
  • Module configuration or software mismatch after replacement or update

Symptoms

  • Stored U05B7 fault and possible other related communication codes
  • Reduced or disabled rear ADAS features (rear collision alert, cross-traffic alert, blind spot, parking assist)
  • Warning lamp or message on dash related to ADAS or sensor fault
  • Intermittent operation of radar-dependent functions
  • Possible additional network-related faults (multiple U-codes)

What to check

  • Read all stored DTCs and freeze frame data from all modules using a capable scan tool
  • Visual inspection of rear radar module, connector, and harness for corrosion, damage, moisture, or loose pins
  • Verify battery voltage and measure module supply and ground with ignition ON
  • Check CAN bus physical layer voltages (CAN_H / CAN_L) and resistance to verify termination
  • Use a diagnostic tool or bus monitor to confirm the radar module message IDs and message frequency on the network
  • Check for recent software updates or module replacements and confirm correct calibration/programming

Signal parameters

  • CAN bus idle differential ~0 V (CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V); dominant state CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
  • Typical CAN data rates: 250 kb/s or 500 kb/s (vehicle-dependent) — confirm correct bus speed
  • Expected message ID(s) and cycle time for rear radar module (manufacturer-specific); message should appear at regular interval
  • Healthy message CRC/checksum validity and correct payload length
  • Low bus error counters and no continual error frames when module is present

Diagnostic algorithm

  1. Capture and record all network and module DTCs; note freeze frame and occurrence conditions.
  2. Visually inspect radar connector, harness routing, and mounting for damage, water intrusion, or corrosion; repair or clean as needed.
  3. With ignition ON, verify module supply voltage and ground integrity at the connector; repair power/ground faults before proceeding.
  4. Use scan tool or CAN bus monitor to check for the radar module’s diagnostic messages on the bus; confirm message ID, frequency, and payload validity.
  5. If messages are absent or corrupted, measure CAN_H and CAN_L with a scope to look for noise, missing termination, or fault conditions. Check bus resistance (approx. 60 ohms total for CAN).
  6. Isolate wiring: if possible, disconnect the radar module and verify bus behavior and other modules. Repair shorted or open circuits found in wiring.
  7. If wiring and bus are good but module messages remain invalid, attempt a module reset or reflash software if available and supported.
  8. Replace the rear radar module only after confirming wiring, power/ground, and bus are good. After replacement, program/calibrate per manufacturer procedure and clear codes.
  9. Verify repairs by re-checking for presence of valid messages, clearing DTCs, and performing a functional test/road test to confirm ADAS functionality.

Likely causes

  • Corroded/loose connector or damaged wiring at the rear radar module
  • Radar module hardware failure
  • CAN bus error or missing/incorrect termination causing corrupted frames
  • Power or ground fault at the radar module

Fault status

⚠️ Status
Invalid data received from Rear Radar Module A — communication or data integrity issue detected. Rear radar functions may be restricted until resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0121 U0155 U0415 U0424 U1100
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