What it means
Hydrogen Tank A Valve Performance: the component is electrically intact but its response does not match the command.
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
Tank A’s valve controls hydrogen flow from that tank when the fuel-cell system requests it. The controller compares the valve’s reported response with its command; this code sets when the valve circuit appears electrically intact but the valve does not respond as expected.
Common causes
Most likely first.
- Valve stuck mechanically
- 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
- Record freeze-frame data and scan all modules for related communication codes to see whether the fault is isolated to Tank A’s valve or part of a network problem.
- Compare Tank A valve commands and reported status in live data, if available, and note when they disagree.
- With the vehicle safely powered down according to its service instructions, inspect Tank A valve connections and nearby wiring for damage, corrosion, or signs of interference.
- Have a qualified technician check whether the gateway is routing the valve command and status messages correctly.
- If network faults are present, have the CAN bus and terminating resistance checked against the manufacturer’s specification before condemning the valve.
- If wiring and communications are sound, have the Tank A valve inspected for binding or failure using the manufacturer’s procedure.
Common fixes
- Repair a loose, damaged, or corroded Tank A valve connector or wiring.
- Correct a gateway configuration or communication-routing fault.
- Repair the CAN network or replace an out-of-spec termination component as directed by the manufacturer.
- Repair or replace the sticking Tank A valve.
Can I keep driving?
Because a hydrogen tank valve fault can trigger reduced-power operation or shutdown, avoid relying on the vehicle for normal travel; stop safely if warnings escalate or the vehicle loses power. Have the hydrogen system checked promptly, and do not handle or dismantle its high-pressure components.
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.