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)
X
0x50CA77
20682
119
EPM3, Pressure Control
Loop1: Commanded Position
Not Reachable
This error is set if an EPM does not pass
an automatic performance test, which could
indicate trapped pressure.
Y
0x50CA7E
20682
126
EPM3, Pressure Control
Loop1: Actuator Stuck On
This fault detects trapped pressure in the FBM
and/or the EPM.
Z
0x50CB11
20683
17
EPM0, PCL0, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50CB12
20683
18
EPM0, PCL0, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50CB18
20683
24
EPM0, PCL0, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50CB2B
20683
43
EPM0, PCL0, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
Table 8 - Diagnostic Trouble Codes (DTCs)
SD-27-5031 Rev 001 Bendix® GSBC® EPM-90™ (Global Scalable Brake Control Electro-Pneumatic Modulator)
29
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
0x50CB71
20683
113
EPM0, PCL0, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50CC11
1292
17
EPM0, PCL1, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50CC12
20684
18
EPM0, PCL1, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50CC18
20684
24
EPM0, PCL1, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50CC2B
20684
43
EPM0, PCL1, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50CC71
20684
113
EPM0, PCL1, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50CD11
20685
17
EPM1, PCL0, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50CD12
20685
18
EPM1, PCL0, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50CD18
20685
24
EPM1, PCL0, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50CD2B
20685
43
EPM1, PCL0, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50CD71
20685
113
EPM1, PCL0, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50CE11
20686
17
EPM1, PCL1, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50CE12
20686
18
EPM1, PCL1, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50CE18
20686
24
EPM1, PCL1, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50CE2B
20686
43
EPM1, PCL1, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50CE71
20686
113
EPM1, PCL1, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50CF11
20687
17
EPM2, PCL0, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50CF12
20687
18
EPM2, PCL0, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50CF18
20687
24
EPM2, PCL0, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50CF2B
20687
43
EPM2, PCL0, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50CF71
20687
113
EPM2, PCL0, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
Table 8 - Diagnostic Trouble Codes (DTCs)
30
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
0x50D011
20688
17
EPM2, PCL1, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50D012
20688
18
EPM2, PCL1, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50D018
20688
24
EPM2, PCL1, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50D02B
20688
43
EPM2, PCL1, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50D071
20688
113
EPM2, PCL1, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50D111
20689
17
EPM3, PCL0, Inlet Solenoid
Valve: Circuit Short To
Ground
EPM internal electrical failure.
G
0x50D112
20689
18
EPM3, PCL0, Inlet Solenoid
Valve: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50D118
20689
24
EPM3, PCL0, Inlet Solenoid
Valve: Circuit Current Below
Threshold
EPM internal electrical failure.
G
0x50D12B
20689
43
EPM3, PCL0, Inlet Solenoid
Valve: Signal Cross Coupled
EPM internal electrical failure.
G
0x50D171
20689
113
EPM3, PCL0, Inlet Solenoid
Valve: Actuator Stuck
Measured EPM pressure response not
sufficient given the system reported reservoir
pressure.
AA
0x50D211
20690
17
EPM3, PCL1, Inlet Solenoid
Valve: Circuit Short To
- 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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