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Vehicle Safety

Vehicle Recalls320,000+ NHTSA safety recalls Browse VehiclesEvery make, model and year Complaints2.1M+ consumer safety complaints TSBs4.7M technical service bulletins VIN LookupDecode any vehicle VIN instantly OBD Codes12,000+ diagnostic trouble codes Fuel EconomyEPA MPG data for all vehicles Safety Ratings11,700+ NHTSA crash test ratings Investigations5,300+ NHTSA defect investigations StatisticsRecall trends & safety analysis Compare VehiclesTwo vehicles side by side

Consumer Safety

Product Safety9,700+ CPSC product recalls Food Safety28,600+ FDA food recalls Pet Safety1.3M FDA animal adverse events Drug Safety17,500+ FDA drug recalls Device Safety38,400+ FDA device recalls Workplace Safety102,900+ OSHA injury reports Brand HistoryRecall lookup by company

Infrastructure

Bridge Safety624,000 bridge inspections Aviation Safety30,000+ NTSB aviation events Dam Safety92,600 dam safety records Water Safety433,000+ public water systems Railroad Safety438,000+ rail crossings Pipeline Safety8,800+ pipeline incidents State DashboardsSafety grades for all 50 states ZIP ReportAny 5-digit ZIP across 9 datasets

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Network Codes

1,532 OBD-II diagnostic trouble codes in this category.

Showing page 16 of 16 (1,532 codes total)

Code Description Subsystem Severity
U3557 Hydrogen Tank C Valve Enable Circuit Network Communication Medium
U3558 Hydrogen Tank C Valve Network Communication Medium
U3559 Air Inlet Pressure Sensor Circuit Network Communication Medium
U355A Charge Air Cooler Outlet Pressure Sensor 1 Circuit Network Communication Medium
U355B Charge Air Cooler Outlet Pressure Sensor 2 Circuit Network Communication Medium
U355C Charge Air Cooler Outlet Temperature Sensor Circuit Network Communication Medium
U355D Expander Inlet Pressure Sensor 1 Circuit Network Communication Medium
U355E Expander Inlet Pressure Sensor 2 Circuit Network Communication Medium
U355F Cathode Backpressure Valve Control Circuit Network Communication Medium
U3560 Cathode Backpressure Valve Position Sensor Circuit Network Communication Medium
U3561 Cathode Bypass Valve Control Circuit Network Communication Medium
U3562 Cathode Bypass Valve Network Communication Medium
U3563 Cathode Bypass Valve Position Sensor Circuit Network Communication Medium
U3564 Hydrogen Supply Line A Pressure Sensor 1 Circuit Network Communication Medium
U3565 Hydrogen Supply Line A Pressure Sensor 2 Circuit Network Communication Medium
U3566 Anode Inlet Pressure Sensor 1 Circuit Network Communication Medium
U3567 Anode Inlet Pressure Sensor 2 Circuit Network Communication Medium
U3568 Anode Multifunction Valve Control Circuit Network Communication Medium
U3569 Anode Multifunction Valve Network Communication Medium
U356A Anode Drain Valve Control Circuit Network Communication Medium
U356B Anode Drain Valve Network Communication Medium
U356C Anode Header Drain Valve Control Circuit Network Communication Medium
U356D Anode Header Drain Valve Network Communication Medium
U356E Anode Drain Valve Heater Relay Control Circuit Network Communication Medium
U356F Anode Header Drain Valve Heater Relay Control Circuit Network Communication Medium
U3570 Stack Inlet Coolant Temperature Sensor Circuit Network Communication Medium
U3571 Stack Outlet Coolant Temperature Sensor 1 Circuit Network Communication Medium
U3572 Stack Outlet Coolant Temperature Sensor 2 Circuit Network Communication Medium
U3573 Coolant Mixing Valve Control Circuit Network Communication Medium
U3574 Coolant Mixing Valve Network Communication Medium
U3575 Coolant Mixing Valve Position Sensor Circuit Network Communication Medium
U3576 Stack Differential Pressure Sensor Circuit Network Communication Medium
Previous 1 ... 13 14 15 16

All OBD-II Categories

About Network Codes

This page lists all 1,532 OBD-II diagnostic trouble codes classified under the Network category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the network system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.

When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.

Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.