01 Radiator Cap Warning Signs: Save Your Engine from Overheati… • 02 Understanding Why Cars Shut Off While Driving and Ensuring … • 03 How a Bad Ground Wire Can Ruin Your Car • 04 Unveiling the Mystery of Gaskets: Your Key to Automotive Se… • 05 This Is Why You’ll Want an Electric Car by 2030 • 06 How to Tell If You Need Wheel Balancing • 07 Solenoid and Valve Body: How They Disrupt Shifting (And How… • 08 Unveiling the 10 Cars That Cost More to Run Than to Buy • 09 5 Spark Plug Replacement Mistakes That Are Killing Your Eng… • 10 Why Aren’t the Rear Tires on Cars Made to Turn Like the Fro… •

DTC codes / U04xx · Invalid data received from a module / U0468

U0468Invalid Data Received From Fuel Cell Control Module

U0468 is a communication fault indicating that a control module received invalid or corrupted data from the fuel cell control module over the vehicle's network. The computer detected a message from the fuel cell module that did not match the expected format or contained out-of-range values, so it flagged the data as invalid rather than trusting it.

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) on the dashboard
  • Often no symptoms besides the warning light, especially if the fuel cell system is not actively powering the vehicle
  • Reduced power or a limp-home mode if the vehicle relies on the fuel cell for propulsion
  • Intermittent stalling or failure to start in fuel-cell-electric vehicles
  • Other warning messages related to the fuel cell or high-voltage system
  • Poor fuel economy or increased hydrogen consumption in hybrid fuel cell applications

Common causes, most likely first

  1. Corroded, loose, or damaged wiring or connectors in the controller area network (CAN) bus between the fuel cell control module and the receiving module
  2. Faulty fuel cell control module software or internal hardware failure causing it to transmit invalid data
  3. Low or unstable voltage supply to the fuel cell control module, often from a weak 12-volt battery or poor ground connection
  4. Electromagnetic interference (EMI) from high-voltage cables or aftermarket electronics corrupting the CAN bus signal
  5. A failed or improperly terminated CAN bus segment, such as a missing terminating resistor or shorted bus line
  6. Water intrusion or physical damage to the fuel cell control module connector or harness
  7. Outdated software in the receiving module that misinterprets valid data from the fuel cell module

How to diagnose and fix it

  1. Connect a scan tool and record all stored codes, freeze-frame data, and live data from the fuel cell control module to confirm U0468 is current and not history
  2. Inspect the fuel cell control module harness and connectors for corrosion, loose pins, chafing, or water intrusion, and repair as needed
  3. Measure battery voltage and check the fuel cell control module ground connections for excessive resistance
  4. Perform a CAN bus integrity test with an oscilloscope or multimeter to check for shorts, opens, or improper termination
  5. Check for technical service bulletins (TSBs) or software updates for the fuel cell control module and other modules on the network
  6. If wiring and power are good, substitute a known-good fuel cell control module or reflash the existing module with the latest calibration
  7. Clear codes and perform a road test to verify the repair, monitoring live data for any recurring invalid data messages

When the fuel cell module is not the culprit

  • A weak or failing 12-volt battery is a common cause of U0468 because the fuel cell control module may boot up slowly or transmit corrupted data when supply voltage dips during cranking.
  • Aftermarket accessories wired into the CAN bus, such as dash cams or alarm systems, can introduce interference that corrupts fuel cell module messages and sets this code.
  • The code can be stored intermittently by a single glitch, so always check the freeze-frame data and occurrence counter before replacing any module.
  • In some vehicles, the fuel cell control module shares a bus segment with other high-voltage modules, so a fault in a different module can disrupt communication and set U0468 indirectly.
  • A missing or corroded chassis ground for the fuel cell control module can cause invalid data without any visible wiring damage, so voltage drop testing is essential.

Can I keep driving with U0468?

If the vehicle drives normally and the only symptom is the warning light, you can drive to a workshop for diagnosis, but avoid long trips or heavy loads. If the vehicle enters limp mode, stalls, or shows other fuel cell warnings, stop driving and have it towed to prevent further damage or safety risk.

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage