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.

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 481–504 of 9253

Most searched first

C05B1Brake Hydraulic Circuit D LeakUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B1 concerns brake hydraulic circuit d leak. Learn what this fault indicates and where to begin diagnosis.C05B2Steering Wheel Angle Sensor Signal - Yaw Rate Sensor Signal CorrelationUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B2 concerns steering wheel angle sensor signal - yaw rate sensor signal correlation. Learn what this fault indicates and where to begin diagnosis.C05B3Brake Booster Temperature Sensor C Circuit LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B3 concerns brake booster temperature sensor c circuit low. Learn what this fault indicates and where to begin diagnosis.C05B4Brake Booster Temperature Sensor C Circuit HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B4 concerns brake booster temperature sensor c circuit high. Learn what this fault indicates and where to begin diagnosis.C05B5Brake Booster Temperature Sensor C Circuit/OpenUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B5 concerns brake booster temperature sensor c circuit/open. Learn what this fault indicates and where to begin diagnosis.C05B6Brake Booster Temperature Sensor C Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B6 concerns brake booster temperature sensor c circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05B7Brake Booster Temperature Sensor C Circuit Intermittent/ErraticUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B7 concerns brake booster temperature sensor c circuit intermittent/erratic. Learn what this fault indicates and where to begin diagnosis.C05B8Brake Booster Motor A Position Sensor Supply Circuit/OpenUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B8 concerns brake booster motor a position sensor supply circuit/open. Learn what this fault indicates and where to begin diagnosis.C05B9Brake Booster Motor A Position Sensor Supply Circuit LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B9 concerns brake booster motor a position sensor supply circuit low. Learn what this fault indicates and where to begin diagnosis.C05BABrake Booster Motor A Position Sensor Supply Circuit HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BA concerns brake booster motor a position sensor supply circuit high. Learn what this fault indicates and where to begin diagnosis.C05BBBrake Booster Motor A Position Sensor Supply Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BB concerns brake booster motor a position sensor supply circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05BCBrake Booster Motor B Position Sensor Supply Circuit/OpenUrgentChassis & Brakes45–120 minutes for initial diagnosisC05BC concerns brake booster motor b position sensor supply circuit/open. Learn what this fault indicates and where to begin diagnosis.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.