Fault codes U35xx: control unit, high voltage and fuel cell
These codes concern hybrid or electric propulsion (high-voltage battery, electric motor, inverter, charging). High-voltage systems in hybrid and electric vehicles are dangerous: never work on them yourself, call a qualified professional.
Official codes: 119, from smallest to largest. Tap a code to get a direct link to share.
| Code | Meaning |
|---|---|
| U3500 | Control Module Input Power A Circuit Range/Performance |
| U3501 | Control Module Input Power A Circuit Low |
| U3502 | Control Module Input Power A Circuit High |
| U3503 | Control Module Input Power A Circuit Intermittent/Erratic |
| U3504 | Control Module Input Power B Circuit Range/Performance |
| U3505 | Control Module Input Power B Circuit Low |
| U3506 | Control Module Input Power B Circuit High |
| U3507 | Control Module Input Power B Circuit Intermittent/Erratic |
| U3508 | Control Module Input Power C Circuit Range/Performance |
| U3509 | Control Module Input Power C Circuit Low |
| U350A | Control Module Input Power C Circuit High |
| U350B | Control Module Input Power C Circuit Intermittent/Erratic |
| U350C | Control Module Cooling Fan Circuit/Open |
| U350D | Control Module Cooling Fan Circuit Low |
| U350E | Control Module Cooling Fan Circuit High |
| U350F | Control Module Cooling Fan Circuit Range/Performance |
| U3510 | Control Module Missing Calibration |
| U3511 | High Voltage System Interlock Circuit B |
| U3512 | High Voltage System Interlock Circuit B Performance |
| U3513 | High Voltage System Interlock Circuit B Low |
| U3514 | High Voltage System Interlock Circuit B High |
| U3515 | High Voltage System Interlock Circuit C |
| U3516 | High Voltage System Interlock Circuit C Performance |
| U3517 | High Voltage System Interlock Circuit C Low |
| U3518 | High Voltage System Interlock Circuit C High |
| U3519 | High Voltage System Interlock Circuit D |
| U351A | High Voltage System Interlock Circuit D Performance |
| U351B | High Voltage System Interlock Circuit D Low |
| U351C | High Voltage System Interlock Circuit D High |
| U351D | High Voltage System Interlock Circuit E |
| U351E | High Voltage System Interlock Circuit E Performance |
| U351F | High Voltage System Interlock Circuit E Low |
| U3520 | High Voltage System Interlock Circuit E High |
| U3521 | High Voltage System Interlock Circuit F |
| U3522 | High Voltage System Interlock Circuit F Performance |
| U3523 | High Voltage System Interlock Circuit F Low |
| U3524 | High Voltage System Interlock Circuit F High |
| U3525 | High Voltage System Interlock Circuit G |
| U3526 | High Voltage System Interlock Circuit G Performance |
| U3527 | High Voltage System Interlock Circuit G Low |
| U3528 | High Voltage System Interlock Circuit G High |
| U3529 | High Voltage System Interlock Circuit H |
| U352A | High Voltage System Interlock Circuit H Performance |
| U352B | High Voltage System Interlock Circuit H Low |
| U352C | High Voltage System Interlock Circuit H High |
| U352D | High Voltage System Interlock Circuit J |
| U352E | High Voltage System Interlock Circuit J Performance |
| U352F | High Voltage System Interlock Circuit J Low |
| U3530 | High Voltage System Interlock Circuit J High |
| U3531 | High Voltage System Interlock Circuit K |
| U3532 | High Voltage System Interlock Circuit K Performance |
| U3533 | High Voltage System Interlock Circuit K Low |
| U3534 | High Voltage System Interlock Circuit K High |
| U3535 | High Voltage System Interlock Circuit L |
| U3536 | High Voltage System Interlock Circuit L Performance |
| U3537 | High Voltage System Interlock Circuit L Low |
| U3538 | High Voltage System Interlock Circuit L High |
| U3539 | High Voltage System Interlock Circuit M |
| U353A | High Voltage System Interlock Circuit M Performance |
| U353B | High Voltage System Interlock Circuit M Low |
| U353C | High Voltage System Interlock Circuit M High |
| U353D | High Voltage System Interlock Circuit N |
| U353E | High Voltage System Interlock Circuit N Performance |
| U353F | High Voltage System Interlock Circuit N Low |
| U3540 | High Voltage System Interlock Circuit N High |
| U3541 | High Voltage System Interlock Circuit O |
| U3542 | High Voltage System Interlock Circuit O Performance |
| U3543 | High Voltage System Interlock Circuit O Low |
| U3544 | High Voltage System Interlock Circuit O High |
| U3545 | High Voltage System Interlock Circuit P |
| U3546 | High Voltage System Interlock Circuit P Performance |
| U3547 | High Voltage System Interlock Circuit P Low |
| U3548 | High Voltage System Interlock Circuit P High |
| U3549 | Hydrogen Tank High Pressure Sensor 1 Circuit |
| U354A | Hydrogen Tank A Temperature Sensor 1 Circuit |
| U354B | Hydrogen Tank A Temperature Sensor 2 Circuit |
| U354C | Hydrogen Tank B Temperature Sensor 1 Circuit |
| U354D | Hydrogen Tank B Temperature Sensor 2 Circuit |
| U354E | Hydrogen Tank C Temperature Sensor 1 Circuit |
| U354F | Hydrogen Tank C Temperature Sensor 2 Circuit |
| U3550 | Hydrogen Tank A Valve Control Circuit |
| U3551 | Hydrogen Tank A Valve Enable Circuit |
| U3552 | Hydrogen Tank A Valve Performance |
| U3553 | Hydrogen Tank B Valve Control Circuit |
| U3554 | Hydrogen Tank B Valve Enable Circuit |
| U3555 | Hydrogen Tank B Valve Performance |
| U3556 | Hydrogen Tank C Valve Control Circuit |
| U3557 | Hydrogen Tank C Valve Enable Circuit |
| U3558 | Hydrogen Tank C Valve |
| U3559 | Air Inlet Pressure Sensor Circuit |
| U355A | Charge Air Cooler Outlet Pressure Sensor 1 Circuit |
| U355B | Charge Air Cooler Outlet Pressure Sensor 2 Circuit |
| U355C | Charge Air Cooler Outlet Temperature Sensor Circuit |
| U355D | Expander Inlet Pressure Sensor 1 Circuit |
| U355E | Expander Inlet Pressure Sensor 2 Circuit |
| U355F | Cathode Backpressure Valve Control Circuit |
| U3560 | Cathode Backpressure Valve Position Sensor Circuit |
| U3561 | Cathode Bypass Valve Control Circuit |
| U3562 | Cathode Bypass Valve |
| U3563 | Cathode Bypass Valve Position Sensor Circuit |
| U3564 | Hydrogen Supply Line A Pressure Sensor 1 Circuit |
| U3565 | Hydrogen Supply Line A Pressure Sensor 2 Circuit |
| U3566 | Anode Inlet Pressure Sensor 1 Circuit |
| U3567 | Anode Inlet Pressure Sensor 2 Circuit |
| U3568 | Anode Multifunction Valve Control Circuit |
| U3569 | Anode Multifunction Valve |
| U356A | Anode Drain Valve Control Circuit |
| U356B | Anode Drain Valve |
| U356C | Anode Header Drain Valve Control Circuit |
| U356D | Anode Header Drain Valve |
| U356E | Anode Drain Valve Heater Relay Control Circuit |
| U356F | Anode Header Drain Valve Heater Relay Control Circuit |
| U3570 | Stack Inlet Coolant Temperature Sensor Circuit |
| U3571 | Stack Outlet Coolant Temperature Sensor 1 Circuit |
| U3572 | Stack Outlet Coolant Temperature Sensor 2 Circuit |
| U3573 | Coolant Mixing Valve Control Circuit |
| U3574 | Coolant Mixing Valve |
| U3575 | Coolant Mixing Valve Position Sensor Circuit |
| U3576 | Stack Differential Pressure Sensor Circuit |
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Official meanings: OBDex (public domain, CC0). Manufacturer codes: dtc-database (MIT license), probable meanings not verified by the manufacturers. The same meaning can vary depending on the model: always have a diagnosis confirmed by a professional.