Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

Sensors & Electronics Urgent P · Powertrain Clear all

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 1–24 of 26

Most searched first

P0049Turbocharger/Supercharger A Turbine OverspeedUrgentSensors & Electronics30–120 minutes for initial diagnosisP0049 relates to turbocharger/supercharger a turbine overspeed. Check the fault conditions and vehicle-specific procedure before replacing parts.P00C5Turbocharger/Supercharger B Turbine OverspeedUrgentSensors & Electronics30–120 minutes for initial diagnosisP00C5 relates to turbocharger/supercharger b turbine overspeed. Check the fault conditions and vehicle-specific procedure before replacing parts.P0297Vehicle Overspeed ConditionUrgentSensors & Electronics30–120 minutes for initial diagnosisP0297 relates to vehicle overspeed condition. Check the fault conditions and vehicle-specific procedure before replacing parts.P0298Engine Oil Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP0298 relates to engine oil over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P0550Power Steering Pressure Sensor Circuit MalfunctionUrgentSensors & Electronics30–120 minutes for initial diagnosisP0550 indicates a fault related to power steering pressure sensor circuit malfunction. Learn the likely causes and a practical diagnostic order before replacing parts.P0551Power Steering Pressure Sensor Circuit Range/PerformanceUrgentSensors & Electronics30–120 minutes for initial diagnosisP0551 indicates a fault related to power steering pressure sensor circuit range/performance. Learn the likely causes and a practical diagnostic order before replacing parts.P0552Power Steering Pressure Sensor Circuit Low InputUrgentSensors & Electronics30–120 minutes for initial diagnosisP0552 indicates a fault related to power steering pressure sensor circuit low input. Learn the likely causes and a practical diagnostic order before replacing parts.P0553Power Steering Pressure Sensor Circuit High InputUrgentSensors & Electronics30–120 minutes for initial diagnosisP0553 indicates a fault related to power steering pressure sensor circuit high input. Learn the likely causes and a practical diagnostic order before replacing parts.P0554Power Steering Pressure Sensor Circuit IntermittentUrgentSensors & Electronics30–120 minutes for initial diagnosisP0554 indicates a fault related to power steering pressure sensor circuit intermittent. Learn the likely causes and a practical diagnostic order before replacing parts.P0571Brake Switch A Circuit MalfunctionUrgentSensors & Electronics30–120 minutes for initial diagnosisP0571 indicates a fault related to brake switch a circuit malfunction. Learn the likely causes and a practical diagnostic order before replacing parts.P0572Brake Switch A Circuit LowUrgentSensors & Electronics30–120 minutes for initial diagnosisP0572 indicates a fault related to brake switch a circuit low. Learn the likely causes and a practical diagnostic order before replacing parts.P0573Brake Switch A Circuit HighUrgentSensors & Electronics30–120 minutes for initial diagnosisP0573 indicates a fault related to brake switch a circuit high. Learn the likely causes and a practical diagnostic order before replacing parts.P05C0Active Grille Air Shutter Module A Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP05C0 relates to active grille air shutter module a over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C1Active Grille Air Shutter Module B Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP05C1 relates to active grille air shutter module b over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P0703Brake Switch B CircuitUrgentSensors & Electronics30–120 minutes for initial diagnosisP0703 relates to brake switch b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0719Brake Switch B Circuit LowUrgentSensors & Electronics30–120 minutes for initial diagnosisP0719 relates to brake switch b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P094DHydraulic Pump Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP094D relates to hydraulic pump over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P21B4NOx Adsorber - Over Temperature Bank 1UrgentSensors & Electronics30–120 minutes for initial diagnosisP21B4 relates to nox adsorber - over temperature bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P21B5NOx Adsorber - Over Temperature Bank 2UrgentSensors & Electronics30–120 minutes for initial diagnosisP21B5 relates to nox adsorber - over temperature bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P263EGlow Plug Control Module 1 Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP263E relates to glow plug control module 1 over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P263FGlow Plug Control Module 2 Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP263F relates to glow plug control module 2 over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P2C75Active Grille Air Shutter Module C Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP2C75 relates to active grille air shutter module c over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P2C78Active Grille Air Shutter Module D Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP2C78 relates to active grille air shutter module d over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P2C80AIR System Pump Overspeed Bank 1UrgentSensors & Electronics30–120 minutes for initial diagnosisP2C80 relates to air system pump overspeed bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.