What it means
Hydrogen Tank C Valve Enable Circuit: an electrical fault is present in the circuit.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
The Tank C valve enable circuit supplies the electrical permission for that tank’s valve control. This code sets when the enable path has an electrical fault, potentially leaving the Tank C valve unable to operate when requested.
Common causes
Most likely first.
- Enable wire open or relay failed
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Save freeze-frame data and scan all modules for related communication, relay, and power-supply codes.
- Check live data for the Tank C valve enable request and status, if available, to see whether enable is being commanded.
- With the vehicle safely powered down under its service instructions, inspect the Tank C enable wiring, connectors, and relay area for damage or corrosion.
- Test the enable fuse, relay, and circuit continuity using the manufacturer's wiring diagram and specification.
- If other modules also show communication faults, have the gateway and CAN termination checked against the manufacturer's specification.
- If the enable circuit tests correctly, verify the Tank C valve enable input and control response using the manufacturer's procedure.
Common fixes
- Reconnect or repair an open, loose, or damaged Tank C enable wire or connector.
- Replace a failed fuse or enable relay once the circuit has been checked.
- Correct a confirmed gateway routing or CAN network fault.
- Repair the Tank C enable input or control hardware if it fails the specified test.
Can I keep driving?
The Tank C valve may not be enabled, which can cause reduced power or system shutdown; limit driving and stop safely if warnings or performance worsen. Arrange prompt diagnosis and leave hydrogen-system work to qualified technicians.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.