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Harley Diagnostic Trouble Codes

Harley-Davidson Diagnostic Trouble Codes  
2004-2006 (carb and EFI) and 2007-08 models

The codes in this article relate to both carbureted Harleys 2004-2006 as well as 07-08 EFI models.
In 2008 additional codes were added and are not covered here.

The descriptions here are for reference only and do not replace the diagnostics that only a skilled technician can provide. 
Seek the assistance of a qualified Harley technician to accurately diagnose trouble codes or other conditions. 

Speedometer Self Diagnostics: The speedometer is capable of displaying and clearing speedometer, tachometer, TSM/TSSM and ICM/ECM Diagnostic Trouble Codes (DTC). Trouble codes are read via the odometer.

  1. Turn Ignition switch to OFF & the Run/Stop switch to Run. 
  2. Push odometer reset button in & hold. 
  3. Turn ignition switch to Ignition and release odometer reset button. Background lighting should illuminate, speedometer needle should sweep its full range and indicator lamps (battery, security, low fuel, check engine and cruise) should illuminate. The word “diag” will then appear. 
  4. Push the odometer reset button once and you will see the selection menu "PSSPt" with the first P flashing. 
  5. Each letter represents an area of the diagnostics module. The module that is flashing is the one you are going to check. To move from one letter (module) to the next, you push the odometer reset button one time. (from P to S to SP to t and back to P, etc.) 
    P = ECM/ICM (Electronic Control Module refers to EFI models, Ignition Control Module is for Carbureted models) 
    S = TSM/TSSM (Turn Signal / Turn Signal Security Module) 
    SP = speedometer 
    T = tachometer 
  6. To get the DTC within an area of diagnostics, push and hold the odometer reset button in for 5 seconds and release. If there are any DTC’s the code will be displayed, otherwise the word “none” will appear if there are no trouble codes. Push the odometer reset button again to view additional codes if they exist. 
  7. Record each code and reference the list below. 
  8. If DTC’s are not to be cleared, Press and release the odometer reset button. Part number of module will be displayed. 

    NOTE: To determine if a code is current or historic, clear the displayed code by pushing in and holding the odometer reset button ( longer than 5 seconds) until 'clear' comes up. Release the odometer reset button. Turn OFF the ignition switch. Run your bike and shut it down then recheck the DTC’s again by repeating steps 1 to 9. If the code is current it will reappear. 
  9. Press and release the odometer reset button to continue to the next module. 
  10. Turn Ignition switch to OFF. 

On models not equipped with a tachometer "No Rsp" will appear when the tachometer identifier is selected.

"No Rsp" will also appear if the run/off switch is in the off position when doing this procedure.

Also if the code set is a historic code (not a constant light) after 50 start and run cycles of at least 30 seconds each in duration, the light will extinguish itself as long as the error hasn't occurred again.

If it were a current code, the light would remain lit while running.


BUS Er   Serial data bus shorted/low/open/high
B0563   Battery Voltage High TSM/TSSM 
B1004   Fuel Level Sending Unit Low Instruments 
B1005   Fuel Level Sending Unit High/Open Instruments 
B1006   Accessory Line Over voltage Instruments 
B1007   Ignition Line Over voltage Instruments 
B1008   Reset Switch Closed Instruments 
B1122   Right turn output fault
B1131   Alarm Output Low TSM/TSSM 
B1132   Alarm Output High TSM/TSSM 
B1134   Starter Output High TSM/TSSM 
B1135   Accelerometer Fault TSM/TSSM
B1141   Ignition switch open/low
B1151   Sidecar BAS Low TSM/TSSM 
B1152   Sidecar BAS High TSM/TSSM 
B1153   Sidecar BAS Out of Range TSM/TSSM 
P0106   MAP Sensor Rate of Range Error Carb 
P0107   Map Sensor Failed Open/Low Carb 
P0107   Map Sensor Open/Low EFI 
P0108   Map Sensor Failed High Carb 
P0108 Map Sensor High EFI 
P0112   IAT Sensor Voltage Low EFI 
P0113   IAT Sensor Voltage Open/High EFI 
P0117   ET Sensor Voltage Low EFI 
P0118   ET Sensor Voltage Open/High EFI 
P0122   TP Sensor Open/Low EFI 
P0123   TP Sensor High EFI 
P0131   Front 02 sensor low (lean)
P0132   Engine running rich
P0134   Front 02 sensor open/not responding
P0151   Rear 02 sensor low (lean)
P0152   Rear 02 sensor high (rich)
P0154   Rear 02 sensor open/not responding
P0261   Front Injector Open/Low EFI 
P0262   Front Injector High EFI 
P0263   Rear Injector Open/Low EFI 
P0264   Rear Injector High EFI 
P0373   CKP Sensor Intermittent Carb 
P0373   CKP Sensor Intermittent EFI 
P0374   CKP Sensor Not Detected Carb 
P0374   CKP Sensor Sync Error EFI 
P0501   VSS Low Carb 
P0501   VSS Low EFI 
P0502   VSS High/Open Carb 
P0502   VSS High/Open EFI 
P0505   Loss of Idle Sped Control EFI 
P0562   Battery Voltage Low Carb 
P0562   Battery Voltage Low EFI 
P0563   Battery Voltage High Carb 
P0563   Battery Voltage High EFI 
P0602   Calibration Memory Error Carb 
P0603   EEPROM Failure Carb 
P0603   ECM EEPROM Error EFI 
P0604   RAM Failure Carb 
P0605   Program Memory Error Carb 
P0605   ECM Flash Error EFI 
P0607   Converter Error Carb
P0661   Intake solenoid low/open 
P0662   Intake solenoid high/shorted
P1001   System Relay Coil Open/Low EFI 
P1002   System relay Coil High/Shorted EFI 
P1003   System relay Contacts Open EFI 
P1004   System Relay Contacts Closed EFI 
P1009   Incorrect Password Carb 
P1009   Incorrect Password EFI 
P1010   Missing Password Carb 
P1010   Missing Password EFI 
P1351   Front Ignition Open/Low Carb 
P1351   Front Ignition Open/Low EFI 
P1352   Front Ignition Coil High/Shorted Carb 
P1352   Front Ignition Coil High/Shorted EFI 
P1353   Front Cylinder No Combustion EFI 
P1354   Rear Ignition Coil Open/Low Carb 
P1354   Rear Ignition Coil Open/Low EFI 
P1355   Rear Ignition Coil High/Shorted Carb 
P1355   Rear Ignition Coil High/Shorted EFI 
P1356   Rear Cylinder No Combustion EFI 
P1357   Intermittent Secondary Front EFI 
P1358   Intermittent Secondary Rear EFI 
U1016   Loss of ICM/ECM Serial Data Instruments 
U1016   Loss of ECM Serial Data, Vehicle Speed, Vehicle Inhibit Motion or Power train Security Status TSM/TSSM 
U1064   Loss of TSM/TSSM Serial Data Carb 
U1064   Loss of TSM/TSSM Serial Data EFI 
U1064   Loss of TSM/TSSM Serial Data Instruments 
U1097   Loss of Speedometer Serial data Carb 
U1097   Loss of Speedometer Serial data EFI 
U1097   Loss of Speedometer Serial data TSM/TSSM 
U1255   Missing Message at Speedometer EFI 
U1255   Serial Data Error/Missing Message EFI 
U1255   Serial Data Error/Missing Message Instruments 
U1255   Serial Data Error/Missing Message TSM/TSSM 
U1300   Serial Data Low Carb 
U1300   Serial Data Low EFI 
U1300   Serial Data Low Instruments 
U1300   Serial Data Low TSM/TSSM 
U1301   Serial Data Open/High Carb 
U1301   Serial Data Open/High EFI 
U1301   Serial Data Open/High Instruments 
U1301   Serial Data Open/High TSM/TSSM 

2006 models with 02 sensors (Dynas) 

P0131   Front 02 sensor lean for any length of time 
P0151   Rear 02 sensor lean for any length of time 

Above codes can also be set if 02 sensor fails. 


AFR – Air Fuel Ratio 

ATS – Air Temperature Sensor 

BAS – Bank Angle Sensor 

CCM – Cruise Control Module 

CKP – Crank Position Sensor. The CKP generates an “AC signal” which is sent to the ECM where it is used to reference engine position (TDC) and speed. Home position established by taking readings off the 22 teeth on the alternator rotor. 

DTC – Diagnostic Trouble Codes 

ECM – Electronic Control Module. (The Computer) Computes the spark advance for proper ignition timing and fuel control based on sensor inputs (from CKP, MAP & TP sensors) and controls the low-voltage circuits for the ignition coils and injectors. The dwell time for the ignition coil is also calculated in the microprocessor and is dependent upon battery voltage. The programmed dwell feature gives adequate spark at all speeds. 

ECT – Engine Coolant Temperature. Sensor also controls the cooling fan relay that provides 12 Vdc to the fans. 

EFI – Electronic Fuel Injection 

EFP – Electronic Fuel Pump 

ET – Engine Temperature sensor 

FI – Fuel Injectors 

FPR – Fuel Pressure regulator 

IAC – Idle Air Control actuator 

IAT – Intake Air Temperature sensor 

ISS – Ion Sensing System…detonation detection 

MAP – Manifold Absolute Pressure sensor. The MAP sensor monitors the intake manifold pressure (vacuum) and sends the information to the ECM. The EMC then adjusts the spark and fuel-timing advance curves for optimum performance. MAP sensors replace the former VOES used on early models.

TP – Throttle Position Sensor 

TSM/TSSM (Turn Signal/ Turn Signal Security Module) 

VE – Volume Efficiency 

VSS – Vehicle Speed Sensor. Used as an input for idle speed control


Disclaimer: The above is provided for reference purposes only. This site or the contributors of the original content are not liable or responsible for errors, typos, or any information that may lead to incorrect diagnostics or other conditions. Consult a qualified technician for all diagnostics and repairs. 


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