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.

Chassis & Brakes Check soon 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 145–168 of 266

Most searched first

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.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.C055FBSCM/EBBC Hydraulic Unit PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC055F concerns bscm/ebbc hydraulic unit performance. Learn what this fault indicates and where to begin diagnosis.C0561Vacuum Sensor A/B CorrelationCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0561 concerns vacuum sensor a/b correlation. Learn what this fault indicates and where to begin diagnosis.C0563ABS Control Module PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0563 concerns abs control module performance. Learn what this fault indicates and where to begin diagnosis.C0564ABS Control Module System Voltage LowCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0564 concerns abs control module system voltage low. Learn what this fault indicates and where to begin diagnosis.C0565ABS Control Module System Voltage HighCheck soonChassis & Brakes45–120 minutes for initial diagnosisC0565 concerns abs control module system voltage high. Learn what this fault indicates and where to begin diagnosis.C058FRegeneration Torque PerformanceCheck soonChassis & Brakes45–120 minutes for initial diagnosisC058F concerns regeneration torque 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.