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Definition only
Lights the check engine lamp
U3559: Air Inlet Pressure Sensor Circuit
Standardized SAE J2012 code · U35xx codes
What does U3559 mean?
Generic electrical fault on the air inlet pressure sensor of the fuel cell air supply (cathode side, before compressor).
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 U3559 on the same make and model first.
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