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 457–480 of 9253

Most searched first

C0599Brake Booster Control Module Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC0599 concerns brake booster control module missing calibration. Learn what this fault indicates and where to begin diagnosis.C059APower Steering Control Module - Rear Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC059A concerns power steering control module - rear missing calibration. Learn what this fault indicates and where to begin diagnosis.C059BBrake Pressure Sensor B Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC059B concerns brake pressure sensor b missing calibration. Learn what this fault indicates and where to begin diagnosis.C059CBrake Pressure Sensor C Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC059C concerns brake pressure sensor c missing calibration. Learn what this fault indicates and where to begin diagnosis.C059DBrake Pressure Sensor D Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC059D concerns brake pressure sensor d missing calibration. Learn what this fault indicates and where to begin diagnosis.C059EBrake Pressure Sensor E Missing CalibrationUrgentChassis & Brakes45–120 minutes for initial diagnosisC059E concerns brake pressure sensor e missing calibration. Learn what this fault indicates and where to begin diagnosis.C059FBrake Pressure Sensor E Circuit LowUrgentChassis & Brakes45–120 minutes for initial diagnosisC059F concerns brake pressure sensor e circuit low. Learn what this fault indicates and where to begin diagnosis.C05A0Brake Pressure Sensor E Circuit HighUrgentChassis & Brakes45–120 minutes for initial diagnosisC05A0 concerns brake pressure sensor e circuit high. Learn what this fault indicates and where to begin diagnosis.C05A1Brake Pressure Sensor E Circuit/OpenUrgentChassis & Brakes45–120 minutes for initial diagnosisC05A1 concerns brake pressure sensor e circuit/open. Learn what this fault indicates and where to begin diagnosis.C05A2Brake Pressure Sensor E Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05A2 concerns brake pressure sensor e range/performance. Learn what this fault indicates and where to begin diagnosis.C05A3Wheel Speed Sensors Supply Circuit HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A3 concerns wheel speed sensors supply circuit high. Learn what this fault indicates and where to begin diagnosis.C05A4Wheel Speed Sensors Supply Circuit LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A4 concerns wheel speed sensors supply circuit low. Learn what this fault indicates and where to begin diagnosis.C05A5ABS Pump Motor Supply Voltage B Circuit/OpenCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A5 concerns abs pump motor supply voltage b circuit/open. Learn what this fault indicates and where to begin diagnosis.C05A6ABS Pump Motor Supply Voltage B Circuit HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A6 concerns abs pump motor supply voltage b circuit high. Learn what this fault indicates and where to begin diagnosis.C05A7ABS Pump Motor Supply Voltage B Circuit LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A7 concerns abs pump motor supply voltage b circuit low. Learn what this fault indicates and where to begin diagnosis.C05A8ABS Pump Motor Supply Voltage B Circuit Range/PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A8 concerns abs pump motor supply voltage b circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05A9ABS Pump Motor Supply Voltage Circuit A/B CorrelationCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05A9 concerns abs pump motor supply voltage circuit a/b correlation. Learn what this fault indicates and where to begin diagnosis.C05AAABS Pump Motor Temperature Too HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05AA concerns abs pump motor temperature too high. Learn what this fault indicates and where to begin diagnosis.C05ABBrake Blending Separation Valve PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05AB concerns brake blending separation valve performance. Learn what this fault indicates and where to begin diagnosis.C05ACBrake Blending Separation Valve Stuck ClosedUrgentChassis & Brakes45–120 minutes for initial diagnosisC05AC concerns brake blending separation valve stuck closed. Learn what this fault indicates and where to begin diagnosis.C05ADBrake Blending System PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05AD concerns brake blending system performance. Learn what this fault indicates and where to begin diagnosis.C05AEABS Pump Motor Calibration Not LearnedCheck soonChassis & Brakes45–120 minutes for initial diagnosisC05AE concerns abs pump motor calibration not learned. Learn what this fault indicates and where to begin diagnosis.C05AFBrake Booster Motor B Current Sensor Circuit Range/PerformanceUrgentChassis & Brakes45–120 minutes for initial diagnosisC05AF concerns brake booster motor b current sensor circuit range/performance. Learn what this fault indicates and where to begin diagnosis.C05B0Brake Hydraulic Circuit C LeakUrgentChassis & Brakes45–120 minutes for initial diagnosisC05B0 concerns brake hydraulic circuit c leak. Learn what this fault indicates and where to begin diagnosis.