THE CODE DIRECTORY
Diagnostic code references — Page 118.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
U3521
High Voltage System Interlock Circuit F
NetworkRead the code
Generic OBD-II
U3522
High Voltage System Interlock Circuit F Performance
NetworkRead the code
Generic OBD-II
U3523
High Voltage System Interlock Circuit F Low
NetworkRead the code
Generic OBD-II
U3524
High Voltage System Interlock Circuit F High
NetworkRead the code
Generic OBD-II
U3525
High Voltage System Interlock Circuit G
NetworkRead the code
Generic OBD-II
U3526
High Voltage System Interlock Circuit G Performance
NetworkRead the code
Generic OBD-II
U3527
High Voltage System Interlock Circuit G Low
NetworkRead the code
Generic OBD-II
U3528
High Voltage System Interlock Circuit G High
NetworkRead the code
Generic OBD-II
U3529
High Voltage System Interlock Circuit H
NetworkRead the code
Generic OBD-II
U352A
High Voltage System Interlock Circuit H Performance
NetworkRead the code
Generic OBD-II
U352B
High Voltage System Interlock Circuit H Low
NetworkRead the code
Generic OBD-II
U352C
High Voltage System Interlock Circuit H High
NetworkRead the code
Generic OBD-II
U352D
High Voltage System Interlock Circuit J
NetworkRead the code
Generic OBD-II
U352E
High Voltage System Interlock Circuit J Performance
NetworkRead the code
Generic OBD-II
U352F
High Voltage System Interlock Circuit J Low
NetworkRead the code
Generic OBD-II
U3530
High Voltage System Interlock Circuit J High
NetworkRead the code
Generic OBD-II
U3531
High Voltage System Interlock Circuit K
NetworkRead the code
Generic OBD-II
U3532
High Voltage System Interlock Circuit K Performance
NetworkRead the code
Generic OBD-II
U3533
High Voltage System Interlock Circuit K Low
NetworkRead the code
Generic OBD-II
U3534
High Voltage System Interlock Circuit K High
NetworkRead the code
Generic OBD-II
U3535
High Voltage System Interlock Circuit L
NetworkRead the code
Generic OBD-II
U3536
High Voltage System Interlock Circuit L Performance
NetworkRead the code
Generic OBD-II
U3537
High Voltage System Interlock Circuit L Low
NetworkRead the code
Generic OBD-II
U3538
High Voltage System Interlock Circuit L High
NetworkRead the code
Generic OBD-II
U3539
High Voltage System Interlock Circuit M
NetworkRead the code
Generic OBD-II
U353A
High Voltage System Interlock Circuit M Performance
NetworkRead the code
Generic OBD-II
U353B
High Voltage System Interlock Circuit M Low
NetworkRead the code
Generic OBD-II
U353C
High Voltage System Interlock Circuit M High
NetworkRead the code
Generic OBD-II
U353D
High Voltage System Interlock Circuit N
NetworkRead the code
Generic OBD-II
U353E
High Voltage System Interlock Circuit N Performance
NetworkRead the code
Generic OBD-II
U353F
High Voltage System Interlock Circuit N Low
NetworkRead the code
Generic OBD-II
U3540
High Voltage System Interlock Circuit N High
NetworkRead the code
Generic OBD-II
U3541
High Voltage System Interlock Circuit O
NetworkRead the code
Generic OBD-II
U3542
High Voltage System Interlock Circuit O Performance
NetworkRead the code
Generic OBD-II
U3543
High Voltage System Interlock Circuit O Low
NetworkRead the code
Generic OBD-II
U3544
High Voltage System Interlock Circuit O High
NetworkRead the code
Generic OBD-II
U3545
High Voltage System Interlock Circuit P
NetworkRead the code
Generic OBD-II
U3546
High Voltage System Interlock Circuit P Performance
NetworkRead the code
Generic OBD-II
U3547
High Voltage System Interlock Circuit P Low
NetworkRead the code
Generic OBD-II
U3548
High Voltage System Interlock Circuit P High
NetworkRead the code
Generic OBD-II
U3549
Hydrogen Tank High Pressure Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U354A
Hydrogen Tank A Temperature Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U354B
Hydrogen Tank A Temperature Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U354C
Hydrogen Tank B Temperature Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U354D
Hydrogen Tank B Temperature Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U354E
Hydrogen Tank C Temperature Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U354F
Hydrogen Tank C Temperature Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U3550
Hydrogen Tank A Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3551
Hydrogen Tank A Valve Enable Circuit
NetworkRead the code
Generic OBD-II
U3552
Hydrogen Tank A Valve Performance
NetworkRead the code
Generic OBD-II
U3553
Hydrogen Tank B Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3554
Hydrogen Tank B Valve Enable Circuit
NetworkRead the code
Generic OBD-II
U3555
Hydrogen Tank B Valve Performance
NetworkRead the code
Generic OBD-II
U3556
Hydrogen Tank C Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3557
Hydrogen Tank C Valve Enable Circuit
NetworkRead the code
Generic OBD-II
U3558
Hydrogen Tank C Valve
NetworkRead the code
Generic OBD-II
U3559
Air Inlet Pressure Sensor Circuit
NetworkRead the code
Generic OBD-II
U355A
Charge Air Cooler Outlet Pressure Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U355B
Charge Air Cooler Outlet Pressure Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U355C
Charge Air Cooler Outlet Temperature Sensor Circuit
NetworkRead the code
Generic OBD-II
U355D
Expander Inlet Pressure Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U355E
Expander Inlet Pressure Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U355F
Cathode Backpressure Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3560
Cathode Backpressure Valve Position Sensor Circuit
NetworkRead the code
Generic OBD-II
U3561
Cathode Bypass Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3562
Cathode Bypass Valve
NetworkRead the code
Generic OBD-II
U3563
Cathode Bypass Valve Position Sensor Circuit
NetworkRead the code
Generic OBD-II
U3564
Hydrogen Supply Line A Pressure Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U3565
Hydrogen Supply Line A Pressure Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U3566
Anode Inlet Pressure Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U3567
Anode Inlet Pressure Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U3568
Anode Multifunction Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3569
Anode Multifunction Valve
NetworkRead the code
Generic OBD-II
U356A
Anode Drain Valve Control Circuit
NetworkRead the code
Generic OBD-II
U356B
Anode Drain Valve
NetworkRead the code
Generic OBD-II
U356C
Anode Header Drain Valve Control Circuit
NetworkRead the code
Generic OBD-II
U356D
Anode Header Drain Valve
NetworkRead the code
Generic OBD-II
U356E
Anode Drain Valve Heater Relay Control Circuit
NetworkRead the code
Generic OBD-II
U356F
Anode Header Drain Valve Heater Relay Control Circuit
NetworkRead the code
Generic OBD-II
U3570
Stack Inlet Coolant Temperature Sensor Circuit
NetworkRead the code
Generic OBD-II
U3571
Stack Outlet Coolant Temperature Sensor 1 Circuit
NetworkRead the code
Generic OBD-II
U3572
Stack Outlet Coolant Temperature Sensor 2 Circuit
NetworkRead the code
Generic OBD-II
U3573
Coolant Mixing Valve Control Circuit
NetworkRead the code
Generic OBD-II
U3574
Coolant Mixing Valve
NetworkRead the code
Generic OBD-II
U3575
Coolant Mixing Valve Position Sensor Circuit
NetworkRead the code
Generic OBD-II
U3576
Stack Differential Pressure Sensor Circuit
NetworkRead the code
These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.