What it means
Hydrogen Tank B Temperature Sensor 1 Circuit: an electrical fault is present in the circuit.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
Hydrogen tank B temperature sensor 1 measures temperature at the vehicle-designated tank B location. This code identifies an electrical fault in sensor 1's circuit, which can make the control module's tank B temperature data unavailable or unreliable while other tank sensors may remain unaffected.
Common causes
Most likely first.
- Temperature sensor 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
- Scan the fuel-cell and related modules and save freeze-frame data, noting any additional faults for tank B, temperature sensor 1, or communication.
- Check live data for tank B temperature sensor 1 and compare it with the other available tank temperature readings for a missing or implausible value.
- Inspect the tank B sensor 1 connector and accessible wiring for looseness, corrosion, moisture, or physical damage without disturbing hydrogen-system parts.
- Test sensor 1 circuit power, ground, signal, and continuity against the manufacturer's wiring diagram and specifications.
- If the circuit passes, test tank B temperature sensor 1 using the manufacturer's procedure and check the gateway or CAN path if the reported data is still missing.
Common fixes
- Secure or clean a confirmed poor connection at tank B temperature sensor 1.
- Repair damaged sensor 1 wiring or a confirmed power or ground fault.
- Replace tank B temperature sensor 1 if it fails the specified test and its circuit is sound.
- Correct a confirmed gateway or CAN communication fault affecting tank B sensor data.
Can I keep driving?
This fault can make the tank B sensor 1 temperature reading unreliable. If the vehicle displays fuel-cell warnings, reduced power, or a shutdown warning, stop safely and follow the vehicle's instructions.
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.