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 169–192 of 479

Most searched first

C0545VIN Not Programmed or Incompatible - BSCMCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0545 concerns vin not programmed or incompatible - bscm. Learn what this fault indicates and where to begin diagnosis.C0546VIN Not Programmed or IncompatibleCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0546 concerns vin not programmed or incompatible. Learn what this fault indicates and where to begin diagnosis.C0547Vacuum Sensor Supply Voltage Circuit/OpenCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0547 concerns vacuum sensor supply voltage circuit/open. Learn what this fault indicates and where to begin diagnosis.C0548Vacuum Sensor Supply Voltage LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0548 concerns vacuum sensor supply voltage low. Learn what this fault indicates and where to begin diagnosis.C0549Vacuum Sensor A Circuit/OpenCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0549 concerns vacuum sensor a circuit/open. Learn what this fault indicates and where to begin diagnosis.C054AVacuum Sensor A Range/PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054A concerns vacuum sensor a range/performance. Learn what this fault indicates and where to begin diagnosis.C054BVacuum Sensor A Circuit LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054B concerns vacuum sensor a circuit low. Learn what this fault indicates and where to begin diagnosis.C054CVacuum Sensor A Circuit HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054C concerns vacuum sensor a circuit high. Learn what this fault indicates and where to begin diagnosis.C054DVacuum Sensor B Circuit/OpenCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054D concerns vacuum sensor b circuit/open. Learn what this fault indicates and where to begin diagnosis.C054EVacuum Sensor B Range/PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054E concerns vacuum sensor b range/performance. Learn what this fault indicates and where to begin diagnosis.C054FVacuum Sensor B Circuit LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC054F concerns vacuum sensor b circuit low. Learn what this fault indicates and where to begin diagnosis.C0550Vacuum Sensor B Circuit HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0550 concerns vacuum sensor b circuit high. Learn what this fault indicates and where to begin diagnosis.C0551Longitudinal Acceleration Sensor Circuit/OpenCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0551 concerns longitudinal acceleration sensor circuit/open. Learn what this fault indicates and where to begin diagnosis.C0552Longitudinal Acceleration Sensor Range/PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0552 concerns longitudinal acceleration sensor range/performance. Learn what this fault indicates and where to begin diagnosis.C0553Longitudinal Acceleration Sensor Circuit LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0553 concerns longitudinal acceleration sensor circuit low. Learn what this fault indicates and where to begin diagnosis.C0554Longitudinal Acceleration Sensor Circuit HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0554 concerns longitudinal acceleration sensor circuit high. Learn what this fault indicates and where to begin diagnosis.C0555Left Front Wheel Speed Sensor A Incorrect Component InstalledCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0555 concerns left front wheel speed sensor a incorrect component installed. Learn what this fault indicates and where to begin diagnosis.C0556Right Front Wheel Speed Sensor A Incorrect Component InstalledCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0556 concerns right front wheel speed sensor a incorrect component installed. Learn what this fault indicates and where to begin diagnosis.C0557Left Rear Wheel Speed Sensor A Incorrect Component InstalledCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0557 concerns left rear wheel speed sensor a incorrect component installed. Learn what this fault indicates and where to begin diagnosis.C0558Right Rear Wheel Speed Sensor A Incorrect Component InstalledCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0558 concerns right rear wheel speed sensor a incorrect component installed. Learn what this fault indicates and where to begin diagnosis.C0559Power Steering Control Module Range/Performance – RearUrgentChassis & Brakes45–120 minutes for initial diagnosisC0559 concerns power steering control module range/performance – rear. Learn what this fault indicates and where to begin diagnosis.C055AABS Pump Motor Supply Voltage Circuit A HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC055A concerns abs pump motor supply voltage circuit a high. Learn what this fault indicates and where to begin diagnosis.C055BABS Pump Motor Supply Voltage Circuit A LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC055B concerns abs pump motor supply voltage circuit a low. Learn what this fault indicates and where to begin diagnosis.C055CABS Pump Motor Supply Voltage Circuit A Range/PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC055C concerns abs pump motor supply voltage circuit a range/performance. Learn what this fault indicates and where to begin diagnosis.