Network
generic or reserved
U3576
Stack Differential Pressure Sensor Circuit
Generic fault on the differential pressure sensor across the fuel cell stack — measures the pressure drop between cathode and anode (used to detect membrane damage or flooding).
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 76
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: 300–2000 €
- Estimated time: 1–5 h
- Component: stack differential pressure sensor
- Component: sensor wiring
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012