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DTC codes / U04xx · Invalid data received from a module / U0476

U0476Invalid Data Received from Driver Assistance System

U0476 is a communication fault code indicating that a control module received invalid or corrupted data from the driver assistance system over the vehicle's network. The computer detected a message from the driver assistance system that failed its internal validity checks, such as a checksum error or out-of-range value, so it flagged the data as untrustworthy.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaInvalid data received from a module

Symptoms you may notice

  • Illumination of the malfunction indicator lamp (MIL) or a dedicated driver assistance warning light.
  • Often no symptoms besides the warning light, especially if the fault is intermittent.
  • Driver assistance features such as adaptive cruise control, lane keeping assist, or automatic emergency braking may be disabled or behave erratically.
  • A message on the dashboard indicating that forward collision alert or lane departure warning is unavailable.
  • In rare cases, the vehicle may enter a reduced power mode or limit certain functions as a fail-safe.
  • Intermittent operation of driver assistance features, with the warning light cycling on and off.

Common causes, most likely first

  1. Faulty or intermittent wiring and connectors in the controller area network (CAN) bus between the driver assistance system module and the module that set the code.
  2. Software bugs or outdated firmware in the driver assistance system module or the receiving module.
  3. A failing driver assistance system module that is transmitting corrupted data frames.
  4. Low voltage or a weak battery causing modules to reset or transmit invalid data.
  5. Electromagnetic interference from aftermarket accessories or a poorly routed wiring harness.
  6. Corrosion or water intrusion in a connector or module, particularly in areas exposed to the elements.
  7. A malfunctioning sensor (such as a radar or camera) that feeds invalid data to the driver assistance system module.

How to diagnose and fix it

  1. Verify the battery state of charge and perform a voltage drop test on the charging system; low voltage is a common cause of communication faults.
  2. Inspect all connectors and wiring at the driver assistance system module and the receiving module for corrosion, loose pins, or chafed wires.
  3. Check for technical service bulletins (TSBs) or software updates for the driver assistance system module and perform any available reprogramming.
  4. Use a scan tool to read live data and check for other codes in the driver assistance system and related modules; address any underlying sensor or module faults first.
  5. Perform a CAN bus integrity test with an oscilloscope or break-out box to check for signal distortion or intermittent shorts.
  6. If wiring and software are ruled out, substitute a known-good driver assistance system module and retest to confirm the fault.
  7. Clear the code and perform a road test to verify the repair, ensuring the driver assistance features operate correctly.

What most technicians overlook with U0476

  • A weak or failing battery is a frequent culprit because voltage dips during cranking can cause the driver assistance module to send malformed data frames that trigger U0476.
  • Aftermarket accessories wired into the CAN bus, such as dash cams or alarm systems, often introduce interference that corrupts data and sets this code without any hard failure.
  • The code can be set by a module that is not the driver assistance system itself; the receiving module may have a faulty CAN transceiver that misinterprets valid data as invalid.
  • In many cases, U0476 is a stored history code that does not affect driveability and may simply be a remnant of a low-voltage event that has since been resolved.
  • A misaligned or obstructed radar or camera can cause the driver assistance system to output invalid data, so always check sensor calibration and cleanliness before replacing modules.

Can I keep driving with U0476?

The vehicle is generally safe to drive because the fault typically disables only driver assistance features, but you should not rely on adaptive cruise control, lane keeping, or automatic emergency braking until the code is repaired. Avoid long trips or towing until the fault is diagnosed, as a failing module or wiring issue could escalate and affect other systems.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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