Check-engine codes
What does my check-engine code mean?
Plain-English explanations for OBD-II trouble codes: what the code means, the most likely causes, symptoms, and how much labour a repair usually takes.
U3 codes · Network (extended)
- U352DHigh Voltage System Interlock Circuit J
- U352EHigh Voltage System Interlock Circuit J Performance
- U352FHigh Voltage System Interlock Circuit J Low
- U3530High Voltage System Interlock Circuit J High
- U3531High Voltage System Interlock Circuit K
- U3532High Voltage System Interlock Circuit K Performance
- U3533High Voltage System Interlock Circuit K Low
- U3534High Voltage System Interlock Circuit K High
- U3535High Voltage System Interlock Circuit L
- U3536High Voltage System Interlock Circuit L Performance
- U3537High Voltage System Interlock Circuit L Low
- U3538High Voltage System Interlock Circuit L High
- U3539High Voltage System Interlock Circuit M
- U353AHigh Voltage System Interlock Circuit M Performance
- U353BHigh Voltage System Interlock Circuit M Low
- U353CHigh Voltage System Interlock Circuit M High
- U353DHigh Voltage System Interlock Circuit N
- U353EHigh Voltage System Interlock Circuit N Performance
- U353FHigh Voltage System Interlock Circuit N Low
- U3540High Voltage System Interlock Circuit N High
- U3541High Voltage System Interlock Circuit O
- U3542High Voltage System Interlock Circuit O Performance
- U3543High Voltage System Interlock Circuit O Low
- U3544High Voltage System Interlock Circuit O High
- U3545High Voltage System Interlock Circuit P
- U3546High Voltage System Interlock Circuit P Performance
- U3547High Voltage System Interlock Circuit P Low
- U3548High Voltage System Interlock Circuit P High
- U3549Hydrogen Tank High Pressure Sensor 1 Circuit
- U354AHydrogen Tank A Temperature Sensor 1 Circuit
- U354BHydrogen Tank A Temperature Sensor 2 Circuit
- U354CHydrogen Tank B Temperature Sensor 1 Circuit
- U354DHydrogen Tank B Temperature Sensor 2 Circuit
- U354EHydrogen Tank C Temperature Sensor 1 Circuit
- U354FHydrogen Tank C Temperature Sensor 2 Circuit
- U3550Hydrogen Tank A Valve Control Circuit
- U3551Hydrogen Tank A Valve Enable Circuit
- U3552Hydrogen Tank A Valve Performance
- U3553Hydrogen Tank B Valve Control Circuit
- U3554Hydrogen Tank B Valve Enable Circuit
- U3555Hydrogen Tank B Valve Performance
- U3556Hydrogen Tank C Valve Control Circuit
- U3557Hydrogen Tank C Valve Enable Circuit
- U3558Hydrogen Tank C Valve
- U3559Air Inlet Pressure Sensor Circuit
- U355ACharge Air Cooler Outlet Pressure Sensor 1 Circuit
- U355BCharge Air Cooler Outlet Pressure Sensor 2 Circuit
- U355CCharge Air Cooler Outlet Temperature Sensor Circuit
- U355DExpander Inlet Pressure Sensor 1 Circuit
- U355EExpander Inlet Pressure Sensor 2 Circuit
- U355FCathode Backpressure Valve Control Circuit
- U3560Cathode Backpressure Valve Position Sensor Circuit
- U3561Cathode Bypass Valve Control Circuit
- U3562Cathode Bypass Valve
- U3563Cathode Bypass Valve Position Sensor Circuit
- U3564Hydrogen Supply Line A Pressure Sensor 1 Circuit
- U3565Hydrogen Supply Line A Pressure Sensor 2 Circuit
- U3566Anode Inlet Pressure Sensor 1 Circuit
- U3567Anode Inlet Pressure Sensor 2 Circuit
- U3568Anode Multifunction Valve Control Circuit
- U3569Anode Multifunction Valve
- U356AAnode Drain Valve Control Circuit
- U356BAnode Drain Valve
- U356CAnode Header Drain Valve Control Circuit
- U356DAnode Header Drain Valve
- U356EAnode Drain Valve Heater Relay Control Circuit
- U356FAnode Header Drain Valve Heater Relay Control Circuit
- U3570Stack Inlet Coolant Temperature Sensor Circuit
- U3571Stack Outlet Coolant Temperature Sensor 1 Circuit
- U3572Stack Outlet Coolant Temperature Sensor 2 Circuit
- U3573Coolant Mixing Valve Control Circuit
- U3574Coolant Mixing Valve
- U3575Coolant Mixing Valve Position Sensor Circuit
- U3576Stack Differential Pressure Sensor Circuit
Code data: OBDex open dataset (CC0), reviewed and rewritten for drivers. Always confirm a diagnosis before replacing parts.