Network
generic or reserved
U3559
Air Inlet Pressure Sensor Circuit
Generic electrical fault on the air inlet pressure sensor of the fuel cell air supply (cathode side, before compressor).
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 59
Possible causes
- Sensor failed high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–4 h
- Component: air inlet pressure sensor
- Component: sensor wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012