THE CODE DIRECTORY
Diagnostic code references — Page 4.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
C0501
Left Front Wheel Speed Sensor A Range/Performance
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Generic OBD-II
C0502
Left Front Wheel Speed Sensor A Circuit Low
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Generic OBD-II
C0503
Left Front Wheel Speed Sensor A Circuit High
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Generic OBD-II
C0504
Left Front Wheel Speed Sensor A Intermittent/Erratic
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Generic OBD-II
C0505
Left Front Wheel Speed Sensor A Correlation
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Generic OBD-II
C0506
Right Front Wheel Speed Sensor A Circuit/Open
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Generic OBD-II
C0507
Right Front Wheel Speed Sensor A Range/Performance
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Generic OBD-II
C0508
Right Front Wheel Speed Sensor A Circuit Low
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Generic OBD-II
C0509
Right Front Wheel Speed Sensor A Circuit High
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Generic OBD-II
C050A
Right Front Wheel Speed Sensor A Intermittent/Erratic
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Generic OBD-II
C050B
Right Front Wheel Speed Sensor A Correlation
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Generic OBD-II
C050C
Left Rear Wheel Speed Sensor A Circuit/Open
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Generic OBD-II
C050D
Left Rear Wheel Speed Sensor A Range/Performance
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Generic OBD-II
C050E
Left Rear Wheel Speed Sensor A Circuit Low
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Generic OBD-II
C050F
Left Rear Wheel Speed Sensor A Circuit High
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Generic OBD-II
C0510
Left Rear Wheel Speed Sensor A Intermittent/Erratic
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Generic OBD-II
C0511
Left Rear Wheel Speed Sensor A Correlation
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Generic OBD-II
C0512
Right Rear Wheel Speed Sensor A Circuit/Open
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Generic OBD-II
C0513
Right Rear Wheel Speed Sensor A Range/Performance
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Generic OBD-II
C0514
Right Rear Wheel Speed Sensor A Circuit Low
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Generic OBD-II
C0515
Right Rear Wheel Speed Sensor A Circuit High
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Generic OBD-II
C0516
Right Rear Wheel Speed Sensor A Intermittent/Erratic
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Generic OBD-II
C0517
Right Rear Wheel Speed Sensor A Correlation
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Generic OBD-II
C0518
Left Front Wheel Speed Sensor - Mechanical
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Generic OBD-II
C0519
Right Front Wheel Speed Sensor - Mechanical
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Generic OBD-II
C051A
Left Rear Wheel Speed Sensor - Mechanical
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Generic OBD-II
C051B
Right Rear Wheel Speed Sensor - Mechanical
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Generic OBD-II
C051C
Multi-axis Acceleration Sensor Module A Range/Performance
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Generic OBD-II
C051D
Multi-axis Acceleration Sensor Module A Missing Calibration
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Generic OBD-II
C051E
Multi-axis Acceleration Sensor Module A Intermittent/Erratic
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Generic OBD-II
C051F
Multi-axis Acceleration Sensor Module A Correlation
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Generic OBD-II
C0520
Multi-axis Acceleration Sensor Module A
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Generic OBD-II
C0521
Multi-axis Acceleration Sensor Module B Range/Performance
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Generic OBD-II
C0522
Multi-axis Acceleration Sensor Module B Missing Calibration
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Generic OBD-II
C0523
Multi-axis Acceleration Sensor Module B Intermittent/Erratic
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Generic OBD-II
C0524
Multi-axis Acceleration Sensor Module B Correlation
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Generic OBD-II
C0525
Multi-axis Acceleration Sensor Module B
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Generic OBD-II
C0526
Steering Angle Sensor Module
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Generic OBD-II
C0527
Steering Angle Sensor Module Mechanical
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Generic OBD-II
C0528
Steering Angle Sensor Module Range/Performance
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Generic OBD-II
C0529
Steering Angle Sensor Module Missing Calibration
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Generic OBD-II
C052A
Steering Angle Sensor Module Correlation
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Generic OBD-II
C052B
ABS Pump Motor Control Range/Performance
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Generic OBD-II
C052C
ABS Pump Motor Control Circuit/Open
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Generic OBD-II
C052D
ABS Pump Motor Control Circuit High
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Generic OBD-II
C052E
ABS Pump Motor Control Circuit Low
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Generic OBD-II
C052F
ABS Pump Motor Supply Voltage Circuit/Open
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Generic OBD-II
C0530
Motor Control A Range/Performance
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Generic OBD-II
C0531
Motor Control A Circuit/Open
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Generic OBD-II
C0532
Motor Control A Circuit High
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Generic OBD-II
C0533
Motor Control A Circuit Low
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Generic OBD-II
C0534
Motor Control A Supply Voltage Circuit/Open
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Generic OBD-II
C0535
Motor Control B Range/Performance
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Generic OBD-II
C0536
Motor Control B Circuit/Open
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Generic OBD-II
C0537
Motor Control B Circuit High
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Generic OBD-II
C0538
Motor Control B Circuit Low
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Generic OBD-II
C0539
Motor Control B Supply Voltage Circuit/Open
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Generic OBD-II
C053A
ABS Valves Missing Calibration
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Generic OBD-II
C053B
ABS Valves Supply Voltage Circuit/Open
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Generic OBD-II
C053C
Wheel Speed Sensor Generic Range/Performance
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Generic OBD-II
C053D
Brake Pressure Sensor A Range/Performance
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Generic OBD-II
C053E
Brake Pressure Sensor A Circuit Low
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Generic OBD-II
C053F
Brake Pressure Sensor A Circuit High
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Generic OBD-II
C0540
Brake Pressure Sensor A Circuit/Open
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Generic OBD-II
C0541
Brake Pressure Sensor B Range/Performance
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Generic OBD-II
C0542
Brake Pressure Sensor B Circuit Low
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Generic OBD-II
C0543
Brake Pressure Sensor B Circuit High
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Generic OBD-II
C0544
Brake Pressure Sensor B Circuit/Open
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Generic OBD-II
C0545
VIN Not Programmed or Incompatible - BSCM
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Generic OBD-II
C0546
VIN Not Programmed or Incompatible
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Generic OBD-II
C0547
Vacuum Sensor Supply Voltage Circuit/Open
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Generic OBD-II
C0548
Vacuum Sensor Supply Voltage Low
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Generic OBD-II
C0549
Vacuum Sensor A Circuit/Open
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Generic OBD-II
C054A
Vacuum Sensor A Range/Performance
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Generic OBD-II
C054B
Vacuum Sensor A Circuit Low
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Generic OBD-II
C054C
Vacuum Sensor A Circuit High
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Generic OBD-II
C054D
Vacuum Sensor B Circuit/Open
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Generic OBD-II
C054E
Vacuum Sensor B Range/Performance
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Generic OBD-II
C054F
Vacuum Sensor B Circuit Low
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Generic OBD-II
C0550
Vacuum Sensor B Circuit High
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Generic OBD-II
C0551
Longitudinal Acceleration Sensor Circuit/Open
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Generic OBD-II
C0552
Longitudinal Acceleration Sensor Range/Performance
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Generic OBD-II
C0553
Longitudinal Acceleration Sensor Circuit Low
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Generic OBD-II
C0554
Longitudinal Acceleration Sensor Circuit High
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Generic OBD-II
C0555
Left Front Wheel Speed Sensor A Incorrect Component Installed
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Generic OBD-II
C0556
Right Front Wheel Speed Sensor A Incorrect Component Installed
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Generic OBD-II
C0557
Left Rear Wheel Speed Sensor A Incorrect Component Installed
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Generic OBD-II
C0558
Right Rear Wheel Speed Sensor A Incorrect Component Installed
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Generic OBD-II
C0559
Power Steering Control Module Range/Performance – Rear
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Generic OBD-II
C055A
ABS Pump Motor Supply Voltage Circuit A High
ChassisRead the code
Generic OBD-II
C055B
ABS Pump Motor Supply Voltage Circuit A Low
ChassisRead the code
Generic OBD-II
C055C
ABS Pump Motor Supply Voltage Circuit A Range/Performance
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Generic OBD-II
C055D
Brake Hydraulic Circuit B Leak
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Generic OBD-II
C055E
Brake Hydraulic Circuit A Leak
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Generic OBD-II
C055F
BSCM/EBBC Hydraulic Unit Performance
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Generic OBD-II
C0560
Brake Pressure Sensor A Missing Calibration
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Generic OBD-II
C0561
Vacuum Sensor A/B Correlation
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Generic OBD-II
C0562
Brake Pedal Position Sensor Supply Voltage Circuit/Open
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Generic OBD-II
C0563
ABS Control Module Performance
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Generic OBD-II
C0564
ABS Control Module System Voltage Low
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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.