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Home / DTC / U05B5 — Invalid Data Received From Front Radar Module A

U05B5 — Invalid Data Received From Front Radar Module A

Detailed page for trouble code U05B5.

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Code

U05B5

Generic U — Network/User

Invalid Data Received From Front Radar Module A

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 15 RU: 12
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Page language: EN

Causes

  • Faulty/damaged front radar module (hardware or internal processor error)
  • Corroded, loose, or damaged radar connector or wiring harness
  • Poor power supply or ground to the radar module (fuse, relay, battery connection)
  • CAN bus physical fault (short, open, high resistance, missing termination)
  • Software/firmware mismatch or corrupted calibration data in radar module
  • Intermittent electrical noise or electromagnetic interference on the bus

Symptoms

  • Warning lamp or message for radar/ADAS on instrument cluster
  • Adaptive cruise control, automatic emergency braking (AEB), or forward collision warning disabled or unavailable
  • Intermittent or steady DTCs related to radar and other network modules
  • Inconsistent sensor-based vehicle behavior (unexpected braking or gap control loss)
  • Possible diagnostic trouble codes appearing in multiple modules

What to check

  • Use a diagnostic scanner to read U05B5 plus any related codes and freeze frame data
  • Check for other communications codes (U0xxx, U1xxx) or radar-specific codes
  • Visually inspect the radar module, connector, and wiring for damage, corrosion, or water
  • Verify fuses and relays feeding the radar and check battery voltage at the module connector
  • Verify good ground at the module and chassis—inspect multiple ground points
  • Monitor the CAN bus with a scan tool or oscilloscope for valid frames from the radar (IDs, frequency) and correct voltage levels

Signal parameters

  • CAN message ID(s) used by front radar module (manufacturer-specific) and expected periodicity (check service data)
  • Message frequency / update rate (typically a few Hz to tens of Hz depending on message)
  • Data length code (DLC), commonly 8 bytes for radar CAN packets (verify with OEM data)
  • CAN voltage levels: recessive ~2.5 V each side, dominant differential ~2.0 V (CANH higher, CANL lower)
  • Checksum/CRC or status bytes within the radar message (validate using OEM data frame format)
  • Power supply voltage at module connector (approx. battery voltage ~12 V) and ground continuity

Diagnostic algorithm

  1. Connect a factory-level or capable aftermarket scan tool. Record U05B5 and all related trouble codes and freeze frame data.
  2. Note occurrence pattern: permanent, intermittent, only when cold/hot, after impacts or repairs.
  3. Visually inspect the radar assembly and harness for damage, moisture, or connector corrosion. Repair as needed.
  4. Verify fused power and relay operation to the radar. Measure supply voltage at the module connector with key ON; compare to battery voltage.
  5. Verify ground(s) at the radar module and back-probe ground pins for low resistance to chassis.
  6. With scan tool or oscilloscope, monitor the CAN bus while operating relevant systems. Confirm the radar module transmits expected message IDs and valid payload format. Look for noise, missing frames, or malformed frames.
  7. Check CAN termination resistance per manufacturer procedure. Repair wiring faults, shorts, or open circuits found.
  8. If wiring and bus are good, compare radar module software/part number to other modules. Reflash/update software if an OEM update addresses communication errors.
  9. Replace the radar module only after verifying power/ground and network integrity. After replacement or repair, clear codes and perform required sensor calibration/ADAs system relearn per OEM procedure.
  10. Road test to confirm faults do not return and that radar-dependent ADAS features function correctly.

Likely causes

  • Damaged radar connector or pin corrosion causing intermittent/malformed messages
  • Power/ground fault at the radar (blown fuse, intermittent supply) causing corrupt output
  • CAN bus wiring fault or missing 120-ohm termination producing corrupted frames
  • Defective radar module internal fault producing invalid message payloads
  • Module software version incompatible with other network modules

Fault status

⚠️ Status
Invalid data received from Front Radar Module A: module is sending malformed or unexpected CAN messages or communication frames are being corrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 to 3.0 hours

Similar codes

U0235 U0100 U0073 U0155 U0142
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