Full List of all Harley Davidson Diagnostic Codes

Below we have compiled a comprehensive list of Harley Davidson diagnostic codes you may encounter during motorcycle maintenance and troubleshooting.

Carbureted Models (1995-2001)

Engine Management

  • 21: Engine Temperature Sensor Circuit Low
  • 22: Engine Temperature Sensor Circuit High
  • 23: Throttle Position Sensor Low Voltage
  • 24: Throttle Position Sensor High Voltage
  • 25: MAP Sensor Circuit Low
  • 26: MAP Sensor Circuit High
  • 27: Injector Circuit Malfunction Front
  • 28: Injector Circuit Malfunction Rear
  • 31: Front Cylinder No Combustion
  • 32: Rear Cylinder No Combustion
  • 33: System Voltage Low
  • 34: System Voltage High
  • 35: Idle Speed Control Error
  • 41: Front Oxygen Sensor Circuit Low
  • 42: Front Oxygen Sensor Circuit High
  • 43: Rear Oxygen Sensor Circuit Low
  • 44: Rear Oxygen Sensor Circuit High

System Codes

  • 51: EEPROM Error
  • 52: ROM Error
  • 53: RAM Error
  • 54: System Relay Malfunction
  • 55: Serial Data Link Error
  • 56: Password Error/Security
  • 61: CKP Sensor Error
  • 62: VSS Error
  • 63: Tach Output Error
  • 64: Cam Position Error

Evolution Models (1984-1994)

Basic Diagnostic Codes

  • 11: No Engine RPM Signal
  • 12: No VSS Signal
  • 13: MAP Sensor Error
  • 14: Battery Voltage Low
  • 15: Engine Temperature Circuit
  • 16: Throttle Position Error
  • 17: Bank Angle Sensor
  • 18: System Relay
  • 19: Security System

Additional Evolution Specific

  • 71: Carburetor Adjustment Required
  • 72: Ignition Timing Error
  • 73: Low Fuel Pressure
  • 74: Starting System Error
  • 75: Oil Pressure Warning
  • 76: Neutral Switch Circuit
  • 77: Side Stand Switch Circuit
  • 78: Clutch Switch Circuit
  • 79: Turn Signal Circuit Error

ECM Memory and Communication Codes

  • P0605: ECM FLASH Memory Error
  • P0603: ECM EEPROM Memory Error
  • P1600: EFI Module Processor Internal Error
  • P2107: EFI Module Processor Internal Fault
  • P1009: Incorrect Password
  • P1010: Missing Password

Serial Communication

  • U1300: ECM Serial Data Low
  • U1301: ECM Serial Data High
  • U1097: Loss of Speedometer Serial Data to ECM
  • U1064: Loss of TSM/FSFM Serial Data to ECM
  • U1016: Loss of ECM Serial Data
  • U1255: Serial Data Error

System Relay Codes

  • P1001: System Relay Coil Open/Low
  • P1002: System Relay Coil High/Shorted
  • P1003: System Relay Contacts Open
  • P1004: System Relay Contacts Closed

Voltage Reference Codes

  • P0562: Battery Voltage Low
  • P0563: Battery Voltage High
  • P06415: V+Vref 1 Out Of Range
  • P06515: V+Vref 2 Out Of Range

Sensor Codes

Crankshaft Position Sensor

  • P0373: CKP Sensor Intermittent
  • P0374: CKP Sensor Synch Error
  • P0335: Crankshaft Position Sensor Circuit Malfunction
  • P0336: Crankshaft Position Sensor Range/Performance
  • P0337: Crankshaft Position Sensor No Signal

MAP Sensor

  • P0107: Map Sensor Open/Low
  • P0108: Map Sensor High

Temperature Sensors

  • P0117: ET Sensor Low
  • P0118: ET Sensor High
  • P0112: IAT Voltage Low
  • P0113: IAT Voltage Open/High

Throttle Position Sensors

  • P0120: TPS1 Range Error
  • P0220: TPS2 Range Error
  • P0122: TPS1 Low
  • P0123: TPS2 High/Open
  • P0222: TPS2 Low
  • P0223: TPS2 High/Open
  • P2135: TPS Correlation Error

Twist Grip Sensor

  • P2122: TGS1 Low/Open
  • P2123: TGS1 High
  • P2127: TGS2 Low/Open
  • P2128: TGS2 High
  • P2138: TGS Correlation Error
  • P1270: TGS Validation Error

Vehicle Speed Sensor

  • P0501: VSS Sensor Low
  • P0502: VSS Sensor High/Open

Oxygen Sensors

  • P0131: Front Oxygen Sensor Low
  • P0151: Rear Oxygen Sensor Low
  • P0132: Front Oxygen Sensor High
  • P0152: Rear Oxygen Sensor High
  • P0134: Front Oxygen Sensor Inactive
  • P0154: Rear Oxygen Sensor Inactive

EFI System Codes

Motor and Throttle Body

  • P2119: EFI Motor Throttle Body Range Performance
  • P2100: EFI Motor Circuit Open
  • P2101: EFI Motor Circuit Range Performance (Actuation Error)
  • P2102: EFI Motor Circuit Low
  • P2103: EFI Motor Circuit High
  • P2176: EFI Closed Position Not Learned
  • P1514: Air Flow Fault
  • P2105: EFI Forced Engine Shutdown

Operating Modes

  • P1510: EFI Limited Performance Mode
  • P1511: EFI Power Management Mode
  • P1512: EFI Forced Idle Mode
  • P1513: ECM Reduced Power Mode - Battery Voltage
  • P1514: ECM Reduced Power Mode - Engine Temperature
  • P1515: ECM Reduced Power Mode - Oil Pressure
  • P1516: ECM Reduced Power Mode - Throttle Position
  • P1517: ECM Reduced Power Mode - Security

Ignition System

  • P1351: Front Ignition Coil Driver Open/Low
  • P1354: Rear Ignition Coil Driver Open/Low
  • P1352: Front Ignition Coil Driver High/Shorted
  • P1355: Rear Ignition Coil Driver High/Shorted
  • P0351: Ignition Coil Primary Circuit Malfunction (Front)
  • P0352: Ignition Coil Primary Circuit Malfunction (Rear)

Combustion and Fuel System

  • P1357: Front Cylinder Combustion Intermittent
  • P1358: Rear Cylinder Combustion Intermittent
  • P1353: Front Cylinder No Combustion
  • P1356: Rear Cylinder No Combustion
  • P0171: System Too Lean (Front Cylinder)
  • P0172: System Too Rich (Front Cylinder)
  • P0174: System Too Lean (Rear Cylinder)
  • P0175: System Too Rich (Rear Cylinder)

Fuel Injectors

  • P0261: Front Injector Open/Low
  • P0263: Rear Injector Open/Low
  • P0262: Front Injector High
  • P0264: Rear Injector High
  • P0201: Front Injector Circuit Malfunction
  • P0202: Rear Injector Circuit Malfunction

Fuel Pump

  • P0230: Fuel Pump Relay Circuit
  • P0231: Fuel Pump Secondary Circuit Low
  • P0232: Fuel Pump Secondary Circuit High

Exhaust and Emissions

  • P0444: Purge Solenoid Open/Low
  • P0445: Purge Solenoid High
  • P1475: Exhaust Actuation Position Error
  • P1477: Exhaust Actuator Open/Low
  • P1478: Exhaust Actuator Shorted/High

Safety and Security Systems

  • P1501: Jiffy Stand Sensor Low
  • P1502: Jiffy Stand Sensor High
  • P0572: Brake Switch Low
  • P0577: Cruise Control Input High
  • B1142: Smart Security System Internal Fault
  • B1135: Accelerometer Failed
  • B1136: Accelerometer Tip Test Error (HFSM)
  • B1151: Bank Angle Sensor(BAS) Short to Ground
  • B1152: Bank Angle Sensor(BAS) Short to Battery
  • B1153: Bank Angle Sensor(BAS) High
  • B1154: Clutch Switch Input Short to Ground
  • B1155: Neutral Switch Input Short to Battery
  • B1156: Ignition Switch Circuit Intermittent
  • B1157: Handlebar Lock Circuit Malfunction
  • B1158: Security System Communication Error
  • B1159: Security System Antenna Circuit Intermittent
  • B1160: Vehicle Speed Input Error

Turn Signal Module Codes

  • B1121: Left Turn Output Fault (TSM/HFSM)
  • B1122: Right Turn Output Fault (TSM/HFSM)
  • B1123: Left Turn Output Short to Ground (HFSM)
  • B1124: Right Turn Output Short to Ground (HFSM)
  • B1125: Left Turn Output Short to Battery (HFSM)
  • B1126: Right Turn Output Short to Battery (HFSM)

Security System Specific

  • B1134: Starter Output High
  • B1143: Security Antenna Short to Ground (HFSM)
  • B1144: Security Antenna Short to Battery (HFSM)
  • B1145: Security Antenna Open (HFSM)
  • B1131: Alarm Output Low (HFSM)
  • B1132: Alarm Output High (HFSM)
  • B1141: Ignition Switch Low/Open (TSM/HFSM)

System Voltage

  • B0563: Battery Voltage High

Note: TSM = Turn Signal Module, HFSM = Hands-Free Security Module