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)
A
0x506E14
20590
20
Wheel 8 EPM: Circuit Short
To Ground or Open
Hardware fault detected inside EPM. Short to
Gnd detected at high side or low side.
B
0x506E18
20590
24
Wheel 8 EPM: Circuit Current
Below Threshold
Hardware fault detected inside EPM. Sensor
not connected or High side / Low side open.
C
0x506E64
20590
100
Wheel 8 EPM: Signal
Plausibility Failure
Sensor frequency is out of the specified ranges.
D
0x506F12
20591
18
Wheel 9 EPM: Circuit Short
To Battery
Internal WSS Analog signals are not in valid
range. Short to Battery detected at high side or
low side.
A
0x506F14
20591
20
Wheel 9 EPM: Circuit Short
To Ground or Open
Hardware fault detected inside EPM. Short to
Gnd detected at high side or low side.
B
0x506F18
20591
24
Wheel 9 EPM: Circuit Current
Below Threshold
Hardware fault detected inside EPM. Sensor
not connected or High side / Low side open.
C
0x506F64
20591
100
Wheel 9 EPM: Signal
Plausibility Failure
Sensor frequency is out of the specified ranges.
D
0x507012
20592
18
Wheel 10 EPM: Circuit Short
To Battery
Internal WSS Analog signals are not in valid
range. Short to Battery detected at high side or
low side.
A
0x507014
20592
20
Wheel 10 EPM: Circuit Short
To Ground or Open
Hardware fault detected inside EPM. Short to
Gnd detected at high side or low side.
B
0x507018
20592
24
Wheel 10 EPM: Circuit
Current Below Threshold
Hardware fault detected inside EPM. Sensor
not connected or High side / Low side open.
C
0x507064
20592
100
Wheel 10 EPM: Signal
Plausibility Failure
Sensor frequency is out of the specified ranges.
D
0x509556
20629
86
Electro-Pneumatic Module:
Invalid / Incompatible
Configuration
Error is set if inconsistency is found between
EEPROM dataset of the GSBC ECU and
EEPROM dataset of the EPMs, or if any of the
EPMs has incompatible software version.
E
Table 8 - Diagnostic Trouble Codes (DTCs)
22
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
0x509562
20629
98
Electro-Pneumatic Module:
Signal Compare Failure
EPM self-test comparing system supply
pressure to maximum delivery pressure failed.
F
0x50B712
20663
18
EPM0, PCL0 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50B716
20663
22
EPM0, PCL0 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50B721
20663
33
EPM0, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50B722
20663
34
EPM0, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
0x50B728
20663
40
EPM0, PCL0 Pressure
Sensor: Signal Bias Level
Out of Range / Zero
Adjustment Failure
The error is set if the internal EPM pressure
sensor voltage signal is generally too low or too
high (outside of valid signal range).
H
0x50B812
20664
18
EPM0, PCL1 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50B816
20664
22
EPM0, PCL1 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50B818
20664
24
EPM0, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50B821
20664
33
EPM0, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50B822
20664
34
EPM0, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
0x50B828
20664
40
EPM0, PCL1 Pressure
Sensor: Signal Bias Level
Out of Range / Zero
Adjustment Failure
The error is set if the monitoring function
detects too high pressure sensor offset
while not braking.
H
0x50B912
20665
18
EPM1, PCL0 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50B916
20665
22
EPM1, PCL0 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50B918
20665
24
EPM1, PCL0 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50B921
20665
33
EPM1, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50B922
20665
34
EPM1, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
0x50B928
20665
40
EPM1, PCL0 Pressure
Sensor: Signal Bias Level
Out of Range / Zero
Adjustment Failure
The error is set if the internal EPM pressure
sensor voltage signal is generally too low or too
high (outside of valid signal range).
H
0x50BA12
20666
18
EPM1, PCL1 Pressure
Sensor: Circuit Short To
Battery
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)
23
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
0x50BA16
20666
22
EPM1, PCL1 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50BA18
20666
24
EPM1, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50BA21
20666
33
EPM1, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50BA22
20666
34
EPM1, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
0x50BA28
20666
40
EPM1, PCL1 Pressure
Sensor: Signal Bias Level
Out of Range / Zero
Adjustment Failure
The error is set if the monitoring function
detects too high pressure sensor offset
while not braking.
H
0x50BB12
20667
18
EPM2, PCL0 Pressure
Sensor: Circuit Short To
Battery
- 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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