SERVICE BULLETIN
M1508

2025-01-03

M1508 (REV B): 2009-2025 TRIKE PLATFORM - REVERSE MOTOR
Table 3. Part Numbers

Reason for Revision

Past Part No.
Item Description
83388-09,
83388-09A, Reverse Motor Assembly
83388-09B

Refer to Table 1.
Table 1.
Date

Rev

2025-01-03

B

2025-01-02

A

2020-02-26

-

Revision (Rev) Description
Added 2025 models
* Updated: Motorcycles Affected
Added section: PINION EXTENDS BUT
REVERSE MOTOR STALLS OR SPINS
SLOWLY
Added: PINION EXTENDS BUT RE* VERSE MOTOR STALLS OR SPINS
SLOWLY
Initial release

New Part No.
83388-09C

Required Dealer Action
NOTE
It's important to follow all relevant troubleshooting steps
to ensure the correct repair is made. Warranty claims may
be denied if the reverse motor is inspected and it was
determined that only the repair outlined in updated bulletin
M1508 needed to be performed.
Table 4. Required Dealer Action

Purpose for Service Bulletin

Category

To inform dealers of a running change for the new reverse
motor (Part No. 83388-09C) for Trike models. As of January
28, 2020 all Trike platform vehicles will be manufactured using
the new reverse motor. The new reverse motor will be used to
replace reverse motor assemblies (Part No. 83388-09,
83388-09A,83388-09B) that have failed diagnostics. Refer to
Table 3.
This motor contains several improvements for better motor
durability.
A new procedure has been added, Refer to PINION EXTENDS
BUT REVERSE MOTOR STALLS OR SPINS SLOWLY.

1

Must Perform Repair

2

Repair If Presenting Symptom

3

Feature PackCustomer/Dealer Paid

4

Informational Purposes Only

Required

Perform the reverse motor diagnostics and testing per the
service bulletin to determine the required replacement
component:
• Solenoid (Part No. 31400139)

Motorcycles Affected

• Electrical kit (Part No. 31400143)

2009-2025 Trike platform. Refer to Table 2.

If the motor has failed electrically or if there is physical damage
to:

Table 2. Trike Models
Years
2009-2025
2010-2011
2015-2025
2020-2022
2013, 2018, 2023
2023-2025

Description

Model
FLHTCUTG
FLHXXX
FLRT
FLHTCUTGSE
FLHTCUTGANV
FLTRT

• Gear housing
• Planetary gear set
• Pinion gear
• Cracked motor mounting bosses on the gear housing
Replacing the reverse motor assembly is required in these
instances. See the parts manual for reverse motor
replacements.

Markets Affected
All markets are affected.

Part Numbers
Refer to Table 3.

NOTE
In the interest of preserving customer safety and satisfaction, always check for outstanding recalls whenever any motorcycle is brought into your dealership for either maintenance or service.
ROUTING

INITIAL HERE

SERVICE
MANAGER

SALES MANAGER PARTS MANAGER

WARRANTY
PROCESS
MANAGER

LEAD TECHNICIAN TECHNICIAN NO. 1 TECHNICIAN NO. 2 TECHNICIAN NO. 3 RETURN THIS TO

3.

DISASSEMBLE

Without electrical kit: See Figure 3. When reverse is
enabled, the ECM sends 5 V to the RCM through the (TN)
wire. The RCM activates the reverse control solenoid. The
control solenoid activates the reverse motor solenoid
causing the reverse motor to engage and the vehicle to
back up. Reverse is disabled for any of the following
conditions:

ASSEMBLE

• Reverse switch on RHCM is released.

NEW LABOR CODE

• Transmission is shifted into gear.

Guide
Table 5. Service Bulletin Guide
DESCRIPTION AND OPERATION
REVERSE MOTOR STALLS
OR SPINS TOO SLOWLY
REVERSE MOTOR RUNS ON
REVERSE MOTOR INOPERATIVE

REVERSE MOTOR PINION
WILL NOT DISENGAGE

• Engine is stopped.

DESCRIPTION AND OPERATION
The reverse motor uses battery power to move the vehicle in
reverse with the engine running and the transmission in neutral.
The reverse motor is designed for light load, short duration use.
Steep inclines, long distance travel in reverse or attempted
operation with brakes applied will drain the battery or cause
the reverse circuit breaker to trip.
The reverse system is an electrical system with an output drive
connected directly to the vehicle drive when in operation. The
system uses a:
• Reverse motor.
• Reverse motor solenoid.
• Electrical kit (if equipped, contains Printed Circuit Board
(PCB) relay and 2-way switch)
• Reverse control solenoid.

4.

With electrical kit: See Figure 4. When reverse is enabled,
the ECM sends 5 volts to the RCM through the (TN) wire.
The RCM activates the reverse control solenoid. The
control solenoid activates the reverse motor solenoid. When
the reverse motor solenoid is activated, the 2-way switch
and PCB relay are signaled. The 2-way switch supplies
power to the reverse motor causing the reverse motor to
engage and the vehicle to back up. When the reverse
control solenoid deactivates, the PCB relay signals the
2-way switch to supply power to the other post of the
reverse motor. This momentary voltage releases the
tension between the reverse motor gear and drive gear
allowing the solenoid to disengage more easily. Reverse
is disabled for any of the following conditions:
• Reverse switch on RHCM is released.
• Transmission is shifted into gear.
• Engine is stopped.

• Reverse Control Module (RCM).
Table 6. Code Description

• 150 A manual reset circuit breaker.

DTC
P1772
P1775
P1777
P1778

• Reverse hand switch (Located in the Right Hand Control
Module (RHCM)).
See Figure 1. The reverse motor and attached reverse motor
solenoid resembles a starter motor. The assembly is single
direction (reverse) only and cannot be used to move the vehicle
forward. Voltage to the reverse motor assembly is provided
through a 150 A manual reset circuit breaker and the RCM
solenoid, in response to the output of the RCM.

DESCRIPTION
Reverse actuator feedback low
Reverse actuator feedback error
Reverse actuator low
Reverse actuator high

1164773

1
5

Operation

2

The Electronic Control Module (ECM) will enable reverse if
conditions are correct.
• Reverse switch on RHCM is pressed.

3

• Transmission is in neutral.
• Vehicle is not moving.
• Parking brake is disengaged and indicator light is not
illuminated on Instrument Module (IM).

4

• Engine running at less than 1,500 rpm.
• No reverse Diagnostic Trouble Codes (DTCs) are present.
Upon enabling reverse function, the ECM will activate the
reverse telltale lamp located in the IM (FLHTCUTG) or
speedometer (FLRT) and indicate reverse enable status to
other modules via a Controller Area Network (CAN) message.
1.

Once the reverse enable status is acknowledged by the
Body Control Module (BCM), the BCM supplies battery
voltage through the (TN/V) wire to RCM [245] terminal 3.

2.

The RCM sends a signal to the ECM on the (TN/BE) wire.

2 / 20

1.
2.
3.
4.
5.

RCM [245]
RCM solenoid [251B]
RCM solenoid [215A]
Reverse motor assembly
RCM solenoid [246]
Figure 1. Typical Reverse System

M1508

1164892

Figure 2. RHCM: Reverse Switch
215911

2
3
1

4

6

1.
2.
3.

M1508

5

Reverse motor high current input terminal [249B]
4.
Reverse motor solenoid terminal [248]
Reverse motor solenoid
5.
Reverse motor and RCM ground
Reverse motor solenoid high current input terminal
6.
Reverse motor
[249A]
Figure 3. Reverse Motor without Electrical Kit

3 / 20

1416276

11

2

1

3

12

10

4
5

6

9
1.
2.
3.
4.
5.
6.

1178581

8

7

K1/K2 switch
7.
Reverse motor and RCM ground
Terminal [T4]
8.
Reverse motor
Reverse motor solenoid high current terminal
9.
PCB relay
[249A]
Reverse motor solenoid
10. Reverse motor terminal [T12]
Reverse motor solenoid terminal [248]
11. K1/K2 switch ground
Reverse motor terminal [T7]
12. Reverse motor solenoid terminal [248]
Figure 4. Reverse Motor With K1/K2 Switch Assembly
• Diagnostic Trouble Code (DTC) P1772 will set if ECM [78-3]
terminal 4 is shorted to ground.

1

2

• DTC P1775 will set if ECM has detected an error within the
reverse system.
• DTC P1777 will set if ECM [78-3] terminal 16 is shorted to
ground.
• DTC P1778 will set if ECM [78-3] terminal 16 is shorted to
battery voltage.

Diagnostic Tips
There is no breakout box available for testing the reverse motor
system. When performing the diagnostic tests, use the TEST
CONNECTOR KIT (PART NUMBER: HD-41404) and a
multimeter.
1.
2.

Reset lever (push in direction of arrow to reset)
Manual trip pushbutton
Figure 5. Reverse Motor Circuit Breaker

Conditions for Settings
These DTCs will set while attempting to engage reverse.

4 / 20

The reverse system may not work properly if battery voltage is
lower than 10 V. Connect battery to battery charger before
performing any diagnostic tests.
Raise the rear wheels off the ground by placing jack stands
under the rear axle before performing any diagnostic tests that
require pushing the reverse button.
Before proceeding with diagnostic tests, always:

M1508

• Check all fuses.
• Check that battery is fully charged.
• Check that charging system is working properly.
• Check that parking brake is disengaged and indicator lamp
is not illuminated.
• Trip and reset the 150 A circuit breaker.

NOTE
See Figure 5. The circuit breaker is manually resettable with a
trip pushbutton and a reset lever.
To manually trip the circuit breaker:
1.

Push down on the trip pushbutton.

2.

Reset lever will extend out.

NOTE
When the reset lever is extended as shown, the circuit breaker
is open/tripped.
1.

To reset, press the reset lever toward the circuit breaker
body until an audible click is heard and the lever is fully
seated against the circuit breaker body.

M1508

2.

If the circuit breaker repeatedly opens under non-strenuous
loading conditions, or if the reverse motor will not operate
after resetting circuit breaker and checking fuses, proceed
with diagnostics.

NOTE
• When the circuit breaker trips, the reverse motor pinion gear
engages the ring gear. This is normal.
• There should be an audible "click" when resetting the circuit
breaker. Press the reset switch until it is fully seated against
the circuit breaker body.
• The reverse enable indicator may remain on while the circuit
breaker is open.
It is very important that the vehicle starts and runs correctly. If
the vehicle does not start and run properly, it can cause the
reverse system to operate improperly.

Connector Information
For additional information about the connectors in the following
diagram(s) and diagnostic procedure(s), including the color of
the harness test kit terminal probes, see Wire Harness
Connectors/General in the service manual supplement.

5 / 20

System Power

Ground

Reverse Light Power

CAN Low

CAN High
Neutral Switch Input

Accessory Power
R/Y

R/GN

[1A]
[1B]

BK/GN

5

D2 D3 E2 G2 G4 L3 M2
TN/V

5

4

[242A]
[242B]

D2 D3 E2 G2 G4 L3 M2

W/BK

4

2

[39A]