NHTSA ID Number: 11018271
Manufacturer Communication Number: SD-27-5031
TSB/Document Date: 2025-05-14
Summary
Service Data Instructions - Bendix
® GSBC® EPM-90™ (Global Scalable Brake Control Electro-Pneumatic Modulator)
U
0x50BF9D
20671
157
Electro-Pneumatic Modulator
0: Component or System
Under Temperature
EPM PCB temperature exceeds the lower
threshold temperature (-40 degrees F / C).
V
0x50C001
20672
1
Electro-Pneumatic Modulator
1: General Electrical Failure
This error is set if the supply voltage of a
switched-off EPM is higher than 4V, while the
EPM is switched off and another is switched
on.
J
K
0x50C002
20672
2
Electro-Pneumatic Modulator
1: General Signal Failure
The error is set if an EPM hardware fault is
detected, or a special inactive DTC message
is sent with wrong content, or if the reference
voltage is out of range, or if the pressure
demand value sent back by the EPM does
not match any of the last 6 pressure demand
values from the GSBC ECU.
0x50C004
20672
4
Electro-Pneumatic Modulator
1 : System Internal Failures
The failure is reported for a variety of EPM
related internal faults.
L
0x50C007
20672
7
Electro-Pneumatic Modulator
1: Mechanical Failures
The error is set if an EPM hardware fault is
detected.
M
0x50C009
20672
9
Electro-Pneumatic Modulator
1: Component Failures
EPM internal electrical failure.
G
0x50C011
20672
17
Electro-Pneumatic Modulator
1: Circuit Short To Ground
The error is set if supply voltage of EPM
becomes less than 4V or if EPM consumes
more than 8A with supply of EPM switched on.
N
0x50C012
20672
18
Electro-Pneumatic Modulator
1: Circuit Short To Battery
The error is set if supply voltage of EPM
becomes higher than 4V with supply of EPM
switched off.
P
0x50C019
20672
25
Electro-Pneumatic Modulator
1: Circuit Current Above
Threshold
The error is set if supply voltage of EPM
becomes less than 4V or if EPM consumes
more than 8A with supply of EPM switched on.
Q
0x50C025
20672
37
Electro-Pneumatic Modulator
1: Signal Shape / Waveform
Failure
The error is set if implausible voltage drop,
during valve activation, is detected.
R
0x50C029
20672
41
Electro-Pneumatic Modulator
1: Signal Invalid
EPM internal electrical failure.
G
0x50C056
20672
86
Electro-Pneumatic Modulator
1: Invalid / Incompatible
Configuration
The error is set if implausible voltage drop,
during valve activation, is detected.
S
0x50C096
20672
150
Electro-Pneumatic Modulator
1: Component Internal
Failure
The error is set if test routines detect an
internal hardware error of the EPM.
T
0x50C098
20672
152
Electro-Pneumatic Modulator
1: Component or System
Over Temperature
EPM PCB temperature exceeds the upper
threshold temperature (248°F / 120°C).
U
0x50C09D
20672
157
Electro-Pneumatic Modulator
1: Component or System
Under Temperature
EPM PCB temperature exceeds the lower
threshold temperature (-40 degrees F / C).
V
0x50C101
20673
1
Electro-Pneumatic Modulator
2: General Electrical Failure
This error is set if the supply voltage of a
switched-off EPM is higher than 4V, while the
EPM is switched off and another is switched
on.
J
Table 8 - Diagnostic Trouble Codes (DTCs)
26
SD-27-5031 Rev 001 Bendix® GSBC® EPM-90™ (Global Scalable Brake Control Electro-Pneumatic Modulator)
DIAGNOSTIC TROUBLE CODE (DTC) AND SERVICE INFORMATION (CONT.)
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
GO TO
SERVICE
ACTION CODE
LISTED IN
TABLE 9
K
0x50C102
20673
2
Electro-Pneumatic Modulator
2: General Signal Failure
The error is set if an EPM hardware fault is
detected, or a special inactive DTC message
is sent with wrong content, or if the reference
voltage is out of range, or if the pressure
demand value sent back by the EPM does
not match any of the last 6 pressure demand
values from the GSBC ECU.
0x50C104
20673
4
Electro-Pneumatic Modulator
2: System Internal Failures
The failure is reported for a variety of EPM
related internal faults.
L
0x50C107
20673
7
Electro-Pneumatic Modulator
2: Mechanical Failures
The error is set if an EPM hardware fault is
detected.
M
0x50C109
20673
9
Electro-Pneumatic Modulator
2: Component Failures
EPM internal electrical failure.
G
0x50C111
20673
17
Electro-Pneumatic Modulator
2: Circuit Short To Ground
The error is set if supply voltage of EPM
becomes less than 4V or if EPM consumes
more than 8A with supply of EPM switched on.
N
0x50C112
20673
18
Electro-Pneumatic Modulator
2: Circuit Short To Battery
The error is set if supply voltage of EPM
becomes higher than 4V with supply of EPM
switched off.
P
0x50C119
20673
25
Electro-Pneumatic Modulator
2: Circuit Current Above
Threshold
The error is set if supply voltage of EPM
becomes less than 4V or if EPM consumes
more than 8A with supply of EPM switched on.
Q
0x50C125
20673
37
Electro-Pneumatic Modulator
2: Signal Shape / Waveform
Failure
The error is set if implausible voltage drop,
during valve activation, is detected.
R
0x50C129
20673
41
Electro-Pneumatic Modulator
2: Signal Invalid
EPM internal electrical failure.
G
0x50C156
20673
86
Electro-Pneumatic Modulator
2: Invalid / Incompatible
Configuration
The error is set if implausible voltage drop,
during valve activation, is detected.
S
0x50C196
20673
150
Electro-Pneumatic Modulator
2: Component Internal
Failure
The error is set if test routines detect an
internal hardware error of the EPM.
T
0x50C198
20673
152
Electro-Pneumatic Modulator
2: Component or System
Over Temperature
EPM PCB temperature exceeds the upper
threshold temperature (248°F / 120°C).
U
0x50C19D
20673
157
Electro-Pneumatic Modulator
2: Component or System
Under Temperature
EPM PCB temperature exceeds the lower
threshold temperature (-40 degrees°F / °C).
V
0x50C201
20674
1
Electro-Pneumatic Modulator
3: General Electrical Failure
This error is set if the supply voltage of a
switched-off EPM is higher than 4V, while the
EPM is switched off and another is switched
on.
J
K
0x50C202
20674
2
Electro-Pneumatic Modulator
3: General Signal Failure
The error is set if an EPM hardware fault is
detected, or a special inactive DTC message
is sent with wrong content, or if the reference
voltage is out of range, or if the pressure
demand value sent back by the EPM does
not match any of the last 6 pressure demand
values from the GSBC ECU.
0x50C204
20674
4
Electro-Pneumatic Modulator
3: System Internal Failures
The failure is reported for a variety of EPM
related internal faults.
L
0x50C207
20674
7
Electro-Pneumatic Modulator
3: Mechanical Failures
The error is set if an EPM hardware fault is
detected.
M
0x50C209
20674
9
Electro-Pneumatic Modulator
3: Component Failures
EPM internal electrical failure.
G
0x50C211
20674
17
Electro-Pneumatic Modulator
3: Circuit Short To Ground
The error is set if supply voltage of EPM
becomes less than 4V or if EPM consumes
more than 8A with supply of EPM switched on.
N
Table 8 - Diagnostic Trouble Codes (DTCs)
SD-27-5031 Rev 001 Bendix® GSBC® EPM-90™ (Global Scalable Brake Control Electro-Pneumatic Modulator)
27
DIAGNOSTIC TROUBLE CODE (DTC) AND SERVICE INFORMATION (CONT.)
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
GO TO
SERVICE
ACTION CODE
LISTED IN
TABLE 9
0x50C212
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: SD-27-5031
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System: Air Brake Control System
MFR Component Subsystem: Electro-Pneumatic Modulator
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