NHTSA ID Number: 11016934
Manufacturer Communication Number: SD-27-5023V
TSB/Document Date: 2025-04-10
Summary
Bendix GSBC (Global Scalable Brake Control) System and EBS-90 Electronic Control Unit (ECU) service data sheets.
Fault is reported if the bootloader software of the FBM
General
detects
a checksum error in the application software of the A
Checksum Failure
or B controller.
Fault is reported if the data integrity check inside the FBM
General Memory
failed (checksum error, stack overflow, program flow error,
Failure
general integrity of volatile data).
Failure is reported if the monitoring functions detect an
Internal Electronic
Failure
internal HW fault of the electronic control unit of the FBM.
Fault is reported if incompatibility is detected between the
FBM and ECU.
Fault is reported if one of the two DFBM temperature
sensors delivers a high value.
Learned FBM offset is higher than the threshold value of
Performance
the FBM signal that pressure demand should be sent to
or Incorrect
the EPMs above. (Threshold value is set according to the
Operation
mechanical charateristic of the FBM).
Fault is reported if the FBM detects an incompatibility
Unexpected
Operation
between its boot and drive software or detects ICC problem.
Fault is reported if FBM supply voltage is below vehicle
Circuit Short To
Ground
battery voltage by a difference of more than 6V.
Fault is reported if the communication from the ECU to
Circuit Short To
the FBM is disturbed, or if the FBM does not power down
Battery
properly.
Fault
is
reported
if
the
message
counter sent by the FBM
Alive/Sequence
Counter Incorrect/ is inconsistent with the timestamp of reception (short term
Not Updated
observation window < 40 ms).
Fault is reported if the communication between the FBM and
Missing Message
the EBS ECU is disturbed.
Fault is reported if the sensor outputs of the FBM do not
Unexpected
Operation
match but they are in tolerable range.
SD SHEET
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
SD-27-5028
Table 22 – GSBC FBM-40 Diagnostic Trouble Codes (DTCs)
66
SD-27-5023V Rev 000 Bendix
® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
Troubleshooting
GSBC M-50QR DTCS
IMPORTANT
For all repair steps, first complete the following:
1. Generate an ACom Diagnostic Software report.
2. Clear DTCs.
3. Continue with repair information for each active DTC that will not clear.
NOTE: After completing all repairs, drive the vehicle to ensure the repairs were sufficient.
4. Once repairs have been made, clear the DTC again.
SD-27-5170, AVAILABLE ON B2BENDIX.COM
GSBC M-50QR DTCS
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
SD SHEET
0x500511
20485
17
Pressure Control Valve: Circuit
Short To Ground
Modulator common low side shorted to ground
or short circuit.
SD-27-5170
0x500512
20485
18
Pressure Control Valve: Circuit
Short To Battery
Modulator common low side shorted to battery.
SD-27-5170
0x500513
20485
19
Pressure Control Valve: Circuit
Open
0x500549
20485
73
Pressure Control Valve:
Internal Electronic Failure
0x50054B
20485
75
Pressure Control Valve: Over
Temperature
0x500595
20485
149
Pressure Control Valve:
Incorrect Assembly
Modulator common low side open circuit
or broken wire.
Power to HW component (Modulator)
can not be switched off.
Modulator activated for extended
amount of time.
Modulator common low side shorted to other
valve or hardware defect.
0x509F35
20639
53
Axle 1, Left Wheel, Pressure
Control Valve: Signal High
Time Greater Than Maximum
The error is set if modulator activation duration
exceeds a pre-set limit.
SD-27-5170
0x50A035
20640
53
Axle 1, Right Wheel, Pressure
Control Valve: Signal High
Time Greater Than Maximum
The error is set if modulator activation duration
exceeds a pre-set limit.
SD-27-5170
0x50A511
20645
17
Axle 1, Left Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Short To Ground
Short from modulator inlet valve pin to ground.
SD-27-5170
0x50A512
20645
18
Axle 1, Left Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Short To Battery
Short from modulator inlet valve pin
to battery voltage.
SD-27-5170
0x50A518
20645
24
Axle 1, Left Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Current Below
Threshold
Open circuit or broken wire on modulator
inlet valve pin.
SD-27-5170
0x50A52B
20645
43
Axle 1, Left Wheel, Pressure
Control Valve, Inlet Valve:
Signal Cross Coupled
Modulators on opposite sides of vehicle are
shorted together.
SD-27-5170
0x50A611
20646
17
Axle 1, Right Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Short To Ground
Short from modulator inlet valve pin to ground.
SD-27-5170
0x50A612
20646
18
Axle 1, Right Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Short To Battery
Short from modulator inlet valve pin
to battery voltage.
SD-27-5170
SD-27-5170
SD-27-5170
SD-27-5170
SD-27-5170
Table 23 – GSBC M-50QR Diagnostic Trouble Codes (DTCs)
SD-27-5023V Rev 000 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
67
Troubleshooting
GSBC M-50QR DTCS
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
SD SHEET
Open circuit or broken wire on modulator
inlet valve pin.
SD-27-5170
0x50A618
20646
24
Axle 1, Right Wheel, Pressure
Control Valve, Inlet Valve:
Circuit Current Below
Threshold
0x50A62B
20646
43
Axle 1, Right Wheel, Pressure
Control Valve, Inlet Valve:
Signal Cross Coupled
Modulators on opposite sides of vehicle
are shorted together.
SD-27-5170
0x50A711
20647
17
Axle 1, Left Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Short To Ground
Short from modulator outlet valve pin
to ground.
SD-27-5170
0x50A712
20647
18
Axle 1, Left Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Short To Battery
Short from modulator outlet valve pin to battery
voltage.
SD-27-5170
Open circuit or broken wire on modulator
outlet valve pin.
SD-27-5170
0x50A718
20647
24
Axle 1, Left Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Current Below
Threshold
0x50A72B
20647
43
Axle 1, Left Wheel, Pressure
Control Valve, Outlet Valve:
Signal Cross Coupled
Modulators on opposite sides of vehicle
are shorted together.
SD-27-5170
0x50A811
20648
17
Axle 1, Right Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Short To Ground
Short from modulator outlet valve pin
to ground.
SD-27-5170
0x50A812
20648
18
Axle 1, Right Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Short To Battery
Short from modulator outlet valve pin
to battery voltage.
SD-27-5170
Open circuit or broken wire on modulator
outlet valve pin.
SD-27-5170
0x50A818
20648
24
Axle 1, Right Wheel, Pressure
Control Valve, Outlet Valve:
Circuit Current Below
Threshold
0x50A82B
20648
43
Axle 1, Right Wheel, Pressure
Control Valve, Outlet Valve:
Signal Cross Coupled
Modulators on opposite sides of vehicle are
shorted together.
SD-27-5170
0xF00009
61440
9
Electronic Control Unit:
Component Failures
Internal SW fault detected.
SD-27-5170
Table 23 – GSBC M-50QR Diagnostic Trouble Codes (DTCs)
68
SD-27-5023V Rev 000 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
RELATED TECHNICAL DOCUMENTATION REFERENCE
Go to B2Bendix.com to download the latest version of related technical documentation.
DOCUMENT #
BW8207
DOCUMENT TITLE
GSBC Operator’s Manual
SD-27-5028
GSBC FBM-40 Service Data Sheet
SD-27-5031
GSBC EPM-90 Service Data Sheet
SD-27-5036
GSBC eTPCM-90 Service Data Sheet
SD-27-5170
GSBC M-50QR Service Data Sheet
SD-13-4860
Bendix WS-24 Antilock WSS Service Data Sheet
SD-27-4709
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GSAT System Service Data Sheet
BENDIX TECHNICAL SUPPORT
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SD-27-5023V Rev 000 © 3/2025 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse • All Rights Reserved
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Ideal for hydraulic and disc brakes
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
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TSB/Document ID: SD-27-5023V
Replacement Service Bulletin Number:
MFR Communication Date: 2025-04-10
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Communication Type: Service Bulletin/Repair Instructions
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