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.

C · Chassis 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 289–312 of 479

Most searched first

C05BDBrake Booster Motor B Position Sensor Supply Circuit LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BD concerns brake booster motor b position sensor supply circuit low. Learn what this fault indicates and where to begin diagnosis.C05BEBrake Booster Motor B Position Sensor Supply Circuit HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BE concerns brake booster motor b position sensor supply circuit high. Learn what this fault indicates and where to begin diagnosis.C05BFBrake Booster Motor B Position Sensor Supply Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BF concerns brake booster motor b position sensor supply circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05C0Brake Pedal Position Sensor A Not LearnedUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C0 concerns brake pedal position sensor a not learned. Learn what this fault indicates and where to begin diagnosis.C05C1Brake Pedal Position Sensor B Not LearnedUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C1 concerns brake pedal position sensor b not learned. Learn what this fault indicates and where to begin diagnosis.C05C2Brake Booster Motor A Over TemperatureUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C2 concerns brake booster motor a over temperature. Learn what this fault indicates and where to begin diagnosis.C05C3Brake Booster Motor A Supply CircuitUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C3 concerns brake booster motor a supply circuit. Learn what this fault indicates and where to begin diagnosis.C05C4Brake Pressure Sensor F Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C4 concerns brake pressure sensor f missing calibration. Learn what this fault indicates and where to begin diagnosis.C05C5Brake Pressure Sensor F Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C5 concerns brake pressure sensor f circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05C6Brake Pressure Sensor F Circuit LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C6 concerns brake pressure sensor f circuit low. Learn what this fault indicates and where to begin diagnosis.C05C7Brake Pressure Sensor F Circuit HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C7 concerns brake pressure sensor f circuit high. Learn what this fault indicates and where to begin diagnosis.C05C8Brake Pressure Sensor F Circuit/OpenUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C8 concerns brake pressure sensor f circuit/open. Learn what this fault indicates and where to begin diagnosis.C05C9Brake Pressure Sensor Supply CircuitUrgentChassis & Brakes45–120 minutes for initial diagnosisC05C9 concerns brake pressure sensor supply circuit. Learn what this fault indicates and where to begin diagnosis.C05CABrake Master Cylinder Piston Position Sensor A Circuit Voltage HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CA concerns brake master cylinder piston position sensor a circuit voltage high. Learn what this fault indicates and where to begin diagnosis.C05CBBrake Master Cylinder Piston Position Sensor A Circuit Voltage LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CB concerns brake master cylinder piston position sensor a circuit voltage low. Learn what this fault indicates and where to begin diagnosis.C05CCBrake Master Cylinder Piston Position Sensor A Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CC concerns brake master cylinder piston position sensor a circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05CDBrake Master Cylinder Piston Position Sensor B Circuit Voltage HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CD concerns brake master cylinder piston position sensor b circuit voltage high. Learn what this fault indicates and where to begin diagnosis.C05CEBrake Master Cylinder Piston Position Sensor B Circuit Voltage LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CE concerns brake master cylinder piston position sensor b circuit voltage low. Learn what this fault indicates and where to begin diagnosis.C05CFBrake Master Cylinder Piston Position Sensor B Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05CF concerns brake master cylinder piston position sensor b circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05D0Brake Master Cylinder Piston Position Sensor A/B CorrelationUrgentChassis & Brakes45–120 minutes for initial diagnosisC05D0 concerns brake master cylinder piston position sensor a/b correlation. Learn what this fault indicates and where to begin diagnosis.C05D1Brake Master Cylinder Piston Position Sensor Supply CircuitUrgentChassis & Brakes45–120 minutes for initial diagnosisC05D1 concerns brake master cylinder piston position sensor supply circuit. Learn what this fault indicates and where to begin diagnosis.C05D2Master Cylinder Piston Position Higher Than ExpectedCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05D2 concerns master cylinder piston position higher than expected. Learn what this fault indicates and where to begin diagnosis.C05D3Driver Applied Pressure Higher Than ExpectedCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05D3 concerns driver applied pressure higher than expected. Learn what this fault indicates and where to begin diagnosis.C05D4Brake Master Cylinder Piston Position Sensor Calibration Not LearnedUrgentChassis & Brakes45–120 minutes for initial diagnosisC05D4 concerns brake master cylinder piston position sensor calibration not learned. Learn what this fault indicates and where to begin diagnosis.