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Home / DTC / U354A — Hydrogen Tank A Temperature Sensor 1 Circuit

U354A — Hydrogen Tank A Temperature Sensor 1 Circuit

Detailed page for trouble code U354A.

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U354A

Generic U — Network/User

Hydrogen Tank A Temperature Sensor 1 Circuit

Brand: Generic
Type: U — Network/User
Views: UK: 20 EN: 26 RU: 23
AI status
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Page language: EN

Causes

  • Open or shorted sensor wiring (broken conductor, chafing)
  • Poor or corroded connector at sensor or control module
  • Faulty Hydrogen Tank A temperature sensor (thermistor)
  • Contaminated or water-intrusion at connector or sensor
  • Loss of reference voltage or ground from control module
  • Intermittent wiring/connector connection due to vibration or movement

Symptoms

  • Malfunction indicator lamp or system warning related to hydrogen system (manufacturer-dependent)
  • DTC U354A stored in control module
  • Incorrect or implausible temperature reading for Hydrogen Tank A in live data (flat, pegged, or erratic)
  • Possible hydrogen system derate or disable depending on vehicle safety logic
  • Possible inability to perform hydrogen fueling or system safety checks

What to check

  • Retrieve freeze-frame and current live data with a scan tool supporting manufacturer codes
  • Visually inspect sensor connector, wiring harness, and routing for damage, corrosion, or water ingress
  • Backprobe sensor connector and record voltage and signal while operating (observe live temp value)
  • Measure continuity and resistance of sensor circuit between sensor and control module with connector disconnected
  • Check reference voltage and ground at the sensor connector with key on (usually ~5 V reference)
  • Perform wiggle test on wiring while observing live data to find intermittent faults

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature increases) — manufacturer-specific
  • Expected signal voltage range (typical): 0.0–5.0 V at sensor signal circuit
  • Common reference voltage: ~5 V reference from control module (verify vehicle-specific value)
  • Common resistance examples (typical NTC 10 kΩ baseline, vehicle dependent): around 8–12 kΩ at 25 °C; resistance falls with higher temperature and rises with lower temperature — consult manufacturer chart
  • Open-circuit indication: signal voltage may float near reference voltage or be out-of-range on scanner; resistance reads very high (megaohms)
  • Short-circuit indication: signal may read near 0 V; resistance near 0–10 ohms if shorted to ground

Diagnostic algorithm

  1. Connect a compatible scan tool, record U354A details, freeze-frame data and live hydrogen tank temperature. Clear the code and see if it returns. Note intermittent behavior.
  2. Visually inspect the sensor, connector, and wiring harness to Hydrogen Tank A for damage, corrosion, chafing, or water intrusion. Repair any obvious damage.
  3. With connectors disconnected, measure sensor resistance at ambient and compare to manufacturer spec or typical NTC behavior. If unknown, verify that resistance changes when sensor is warmed (e.g., with heat gun) and cooled (ice) — resistance should change smoothly.
  4. Reconnect and backprobe the sensor signal, reference, and ground pins. With ignition on, verify reference voltage (approx. 5 V) present and a good ground. Observe signal voltage on scanner while changing temperature; signal should move gradually, not jump or be pegged.
  5. If reference or ground is missing, trace and test wiring continuity to the module power/ground circuits, repair any open/shorts, and recheck.
  6. If wiring and power/ground are good but signal remains incorrect, substitute a known-good sensor (if available) or replace the sensor and retest.
  7. If replacement sensor does not clear fault and wiring checks good, inspect and test the control module for communication/power issues and consult manufacturer for module tests or reprogramming. Consider opening a technical support inquiry or checking service bulletins.
  8. After repairs, clear codes, perform functional test and confirm code does not return and live data is plausible over operating temperature range.

Likely causes

  • Damaged wiring harness to Tank A temperature sensor
  • Corroded connector or water ingress at sensor connector
  • Failed thermistor inside sensor (open or short)
  • Weak or missing 5V reference or ground from module
  • Intermittent connector pin contact due to movement or contamination

Fault status

⚠️ Status
Hydrogen Tank A Temperature Sensor 1 Circuit — signal out of expected range (open/short/intermittent) detected by control module. Check sensor, wiring, connectors, reference voltage, and module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U354B U354C U0100 U0121 P0112 P0113
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