Harley Trouble Codes

DISCLAIMER: this information is for reference only. Big Bore Bikes does not offer technical support for diagnostic trouble codes. The following procedure will instruct in retrieving and clearing ECM Diagnostic Trouble Codes and TSM/TSSM codes through the Harley gauge cluster as well as a list of codes.

1- Turn Ignition switch to OFF & Run/Stop switch is to Run.

2- Push odometer reset button in & hold. For 2014 & newer touring models this will be the toggle switch on the left control mount.

3- Turn ignition switch to Ignition and release the 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" should 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)[EFI] /Ignition Control Module[Carbureted]) S = TSM/TSSM (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 or the word "none" will appear if there are no DTC's. Push the odometer reset button again to view additional codes if they exist.

7 - Record the codes.

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" (no response) will also appear if the run/off switch is in the off position when doing this procedure.


HFSM = Hands Free Security Module

TSM = Turn signalmodule

DTC’s are designated by a P,C,B or U

P codes indicate issues monitored by ECM

C codes indicate an issue with ABS

B codes are set by Radio, Instruments and BCM

U codes indicate a communication problems with the modules

Fault Code Abbreviation List

ABS – Anti-Lock Braking System

ACR – Automatic Compression Release

AFR – Air Fuel Ratio

AIS – Active Intake Solenoid

ATS – Air Temperature Sensor

BAS – Bank Angle Sensor

BCM – Body Control Module

CAN – Controller Area Network

CCM – Cruise Control Module

CKP – Crank Position Sensor

DLC – Datalink Connector

DTC – Diagnostic Trouble Codes

ECM – Electronic Control Module

ECT – Engine Coolant Temperature

ECU – Electronic Control Unit

EFI – Electronic Fuel Injection

EFP – Electronic Fuel Pump

ET – Engine Temperature sensor

FI – Fuel Injectors

FPR – Fuel Pressure regulator

H-DSSS – Harley-Davidson Smart Security System

HCU – Hydraulic Control Unit, ABS

HFSM – Hands Free Security Module

HO2S – Heated Oxygen Sensor

IAC – Idle Air Control actuator

IAT – Intake Air Temperature sensor

ICM – Ignition Control Module

IMAP – MAP + IAT in one unit

ISS – Ion Sensing System

JSS – Jiffy Stand Sensor

LHCM – Left Hand Control Module

MAP – Manifold Absolute Pressure Sensor

MHR – Right Hand Control Module

RCM – Reverse Control Module

TCA – Throttle Control Actuator

TGS – Twist Grip Sensor

TMAP – Intake Air Temperature / Manifold Absolute Pressure equipment

TPS – Throttle Position Sensor

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

VE – Volume Efficiency

VIN – Vehicle identification number

VSS – Vehicle Speed Sensor

WSS – Wheel Speed Sensor