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U0468 — Invalid Data Received From Fuel Cell Control Module

Generic OBD-II · all makesNetwork / communication

OBD-II code U0468 indicates the vehicle's primary computer (PCM/ECM) has received invalid or out-of-range data from the Fuel Cell Control Module (FCCM). This typically disrupts hybrid or fuel-cell system operation and triggers a check-engine or hybrid-system warning.

Symptoms

What causes it — most likely first

1. Faulty Fuel Cell Control Module (FCCM)

Internal failures in the FCCM, such as corrupted firmware or hardware defects, can send invalid data to the PCM. This is the most common cause of U0468.

2. Wiring or connector issues between FCCM and PCM

Damaged, corroded, or loose wiring harnesses or connectors can corrupt data signals. Shorts to power/ground or open circuits are frequent culprits.

3. Communication bus failure (CAN or LIN network)

A malfunction in the vehicle's communication network, such as a shorted or open bus line, can prevent valid data transmission between modules.

4. Faulty or degraded fuel-cell stack sensors

Sensors providing input to the FCCM (e.g., hydrogen pressure, temperature, or voltage sensors) may fail or drift, causing the FCCM to send invalid data.

5. Power supply issues to the FCCM

Low voltage or unstable power/ground supplies to the FCCM can cause erratic behavior, leading to invalid data transmission.

6. PCM/ECM software or hardware failure (rare)

While uncommon, a fault in the PCM/ECM's communication interface or software could misinterpret valid data as invalid. This is a last-resort diagnosis.

How it's diagnosed

  1. Retrieve and document all stored trouble codes, including pending and history codes, from the PCM and FCCM.
  2. Inspect the wiring harness and connectors between the FCCM and PCM for damage, corrosion, or loose connections. Repair as needed.
  3. Check the vehicle's communication network (CAN/LIN) for proper voltage levels and continuity. Test for shorts to power or ground.
  4. Verify power and ground supplies to the FCCM meet manufacturer specifications. Test for voltage drops or instability.
  5. Use a scan tool to monitor live data from the FCCM and compare it to expected values. Look for erratic or out-of-range signals.
  6. If all other causes are ruled out, consider reflashing or replacing the FCCM. PCM replacement is rarely necessary and should be a last step.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0460 — Invalid Data Received From Automated DU0461 — Invalid Data Received From Audible AleU0462 — Invalid Data Received From Compass ModU0463 — Invalid Data Received From Navigation U0464 — Invalid Data Received From Navigation U0465 — Invalid Data Received From Pto Control

Frequently asked

Is the PCM usually the cause of U0468?

No. The PCM is rarely the cause of U0468. The issue is almost always due to a faulty Fuel Cell Control Module, wiring problems, or communication network failures. Replacing the PCM should only be considered after all other causes are ruled out.

Can I drive with U0468 stored?

Driving with U0468 is not recommended. The vehicle may enter a fail-safe mode, resulting in reduced power or stalling. Additionally, continued driving could cause further damage to the fuel-cell or hybrid system.

Why does U0468 trigger a check-engine light?

The PCM monitors data from the FCCM to ensure proper operation of the fuel-cell or hybrid system. If the data is invalid or missing, the PCM cannot guarantee safe operation, so it triggers the check-engine light to alert the driver.

Can a bad battery cause U0468?

A weak or failing 12V battery can cause voltage instability, which may lead to communication errors between modules, including U0468. However, the battery itself is not the direct cause; it would typically trigger other codes first.