Network & communication
Definition only
Lights the check engine lamp
U355D: Expander Inlet Pressure Sensor 1 Circuit
Standardized SAE J2012 code · U35xx codes
What does U355D mean?
Generic fault on the inlet pressure sensor 1 of the expander (turbine recovering energy from the cathode exhaust on FCEVs).
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High Sensor failed
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U355D on the same make and model first.
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