What it means
Hydrogen Tank A 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 A temperature sensor 1 measures temperature at the vehicle-designated tank A location and sends an electrical signal to the fuel-cell control system. This code means the sensor 1 circuit has an electrical fault, which can make that temperature reading unavailable or unreliable; it does not identify a specific temperature.
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, save freeze-frame data, and check for additional faults naming tank A, temperature sensor 1, or network communication.
- Review live data for tank A temperature sensor 1 and compare it with other tank temperature readings and ambient conditions for missing or implausible data.
- Visually inspect the tank A sensor 1 connector and accessible wiring for looseness, abrasion, corrosion, or moisture without disturbing hydrogen-system components.
- Test the sensor 1 circuit's power, ground, signal, and continuity against the vehicle manufacturer's wiring diagram and specifications.
- If the wiring passes, test tank A temperature sensor 1 according to the manufacturer's procedure, then investigate gateway or CAN faults if the sensor data path remains suspect.
Common fixes
- Secure or clean a confirmed poor electrical connection at tank A temperature sensor 1.
- Repair damaged wiring or a verified circuit power or ground fault for sensor 1.
- Replace tank A temperature sensor 1 if it fails the specified test and its wiring is sound.
- Correct a confirmed gateway or network fault that prevents the sensor data from reaching the control module.
Can I keep driving?
If there are no hydrogen-system warnings or changes in vehicle operation, this electrical fault may not immediately affect drivability, but the tank A temperature reading may be unreliable. Avoid continued use if fuel-cell warnings or reduced power appear, and arrange diagnosis promptly.
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.