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U0460Invalid Data Received From Parking Assist Control Module "A"

Another control module received corrupted or implausible data messages from the parking assist control module over the vehicle network.

Definition

The parking assist control module reports obstacle distances, sensor status, and system readiness over the data bus, and receiving modules (typically the body control module or instrument cluster) run plausibility and message-counter checks on those frames. U0460 sets when messages from parking assist module "A" arrive but contain values that are out of range, internally inconsistent, or fail their integrity checks. The usual result is a "Park Assist Unavailable" or similar message and a disabled parking aid, sometimes with erratic warning chimes; engine operation and driveability are unaffected and the MIL does not normally illuminate.

Common causes

  • A faulty or water-contaminated ultrasonic park sensor feeding bad readings into the module's data
  • Water intrusion into the parking assist module or its connectors (often in the trunk or rear quarter area)
  • Damaged bumper harness wiring from a rear impact or corrosion at the connectors
  • Software or configuration mismatch after module or bumper sensor replacement
  • An internally failing parking assist control module
  • Low system voltage corrupting bus messages

Common misdiagnoses

  • Replacing all ultrasonic bumper sensors when only the module or wiring is at fault
  • Body control module or instrument cluster replacement
  • Replacing the entire bumper harness for a single corroded terminal
  • Battery replacement when charging-system voltage was normal

Troubleshooting steps

  1. 1.Scan the parking assist module directly

    Pull local B- and U-codes from the park assist module itself; a specific sensor circuit code there points to the real fault behind the invalid data.

  2. 2.Review live sensor data

    Watch each ultrasonic sensor's distance reading with objects at known distances and look for a channel that is stuck, dropping out, or reading impossibly.

  3. 3.Inspect the module and connectors for water

    Check the module mounting area and bumper connectors for moisture, green corrosion, or bent pins, especially after rear-end repairs.

  4. 4.Verify power, ground, and bus wiring

    Confirm battery voltage on the module's supply, a solid ground (under 0.1 V drop), and intact CAN/LIN wiring to the bumper area.

  5. 5.Update software and configure

    Apply available calibration updates and confirm the module's coding matches the vehicle's sensor count and options.

  6. 6.Replace the parking assist module if data remains invalid

    With good sensors, wiring, and power confirmed, an internally faulted module is the remaining cause; program it after installation.

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