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.
SD-27-5031
Table 20 - GSBC EPM-90 Diagnostic Trouble Codes (DTCs)
SD-27-5023V Rev 000 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
51
Troubleshooting
GSBC EPM-90 DTCS
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
SD SHEET
0x50BA18
20666
24
EPM1, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
SD-27-5031
0x50BA21
20666
33
EPM1, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
SD-27-5031
0x50BA22
20666
34
EPM1, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
SD-27-5031
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.
SD-27-5031
0x50BB12
20667
18
EPM2, PCL0 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
SD-27-5031
0x50BB16
20667
22
EPM2, PCL0 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
SD-27-5031
0x50BB18
20667
24
EPM2, PCL0 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
SD-27-5031
0x50BB21
20667
33
EPM2, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
SD-27-5031
0x50BB22
20667
34
EPM2, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
SD-27-5031
0x50BB28
20667
40
EPM2, 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).
SD-27-5031
0x50BC12
20668
18
EPM2, PCL1 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
SD-27-5031
0x50BC16
20668
22
EPM2, PCL1 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
SD-27-5031
0x50BC18
20668
24
EPM2, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
SD-27-5031
0x50BC21
20668
33
EPM2, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
SD-27-5031
0x50BC22
20668
34
EPM2, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
SD-27-5031
0x50BC28
20668
40
EPM2, 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.
SD-27-5031
0x50BD12
20669
18
EPM3, PCL0 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
SD-27-5031
Table 20 - GSBC EPM-90 Diagnostic Trouble Codes (DTCs)
52
SD-27-5023V Rev 000 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
Troubleshooting
GSBC EPM-90 DTCS
DTC #
SPN
(J1939)
FMI
(J1939)
DTC NAME
DTC DESCRIPTION
SD SHEET
0x50BD18
20669
24
EPM3, PCL0 Pressure
Sensor: Circuit Current Below
Threshold
EPM internal electrical failure.
SD-27-5031
0x50BD21
20669
33
EPM3, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
SD-27-5031
0x50BD22
20669
34
EPM3, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
SD-27-5031
0x50BD28
20669
40
0x50BE12
20670
18
EPM3, PCL1 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
SD-27-5031
0x50BE16
20670
22
EPM3, PCL1 Pressure
Sensor: Circuit Voltage Below
Threshold
EPM internal electrical failure.
SD-27-5031
0x50BE18
20670
24
EPM3, PCL1 Pressure
Sensor: Circuit Current Below
Threshold
EPM internal electrical failure.
SD-27-5031
0x50BE21
20670
33
EPM3, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
SD-27-5031
0x50BE22
20670
34
EPM3, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
SD-27-5031
0x50BE28
20670
40
EPM3, 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.
SD-27-5031
0x50BF01
20671
1
Electro-Pneumatic Modulator
0: 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.
SD-27-5031
SD-27-5031
EPM3, PCL0 Pressure
The error is set if the internal EPM pressure
Sensor: Signal Bias Level Out sensor
voltage signal is generally too low or too
of Range/Zero Adjustment
high (outside of valid signal range).
Failure
SD-27-5031
0x50BF02
20671
2
Electro-Pneumatic Modulator
0: 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.
0x50BF04
20671
4
Electro-Pneumatic Modulator
0: System Internal Failures
The failure is reported for a variety of EPM
related internal faults.
SD-27-5031
0x50BF07
20671
7
Electro-Pneumatic Modulator
0: Mechanical Failures
The error is set if an EPM hardware fault is
detected.
SD-27-5031
0x50BF09
20671
9
Electro-Pneumatic Modulator
0: Component Failures
EPM internal electrical failure.
SD-27-5031
0x50BF11
20671
17
Electro-Pneumatic Modulator
0: 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.
SD-27-5031
0x50BF12
20671
18
Electro-Pneumatic Modulator
0: Circuit Short To Battery
The error is set if supply voltage of EPM
becomes higher than 4V with supply of EPM
switched off.
SD-27-5031
0x50BF19
20671
25
Electro-Pneumatic Modulator
0: 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.
SD-27-5031
0x50BF25
20671
37
Electro-Pneumatic Modulator
0: Signal Shape/Waveform
Failure
The error is set if implausible voltage drop,
during valve activation, is detected.
SD-27-5031
Table 20 - GSBC EPM-90 Diagnostic Trouble Codes (DTCs)
SD-27-5023V Rev 000 Bendix® GSBC® System and EBS-90™ (Global Scalable Brake Control System and Electronic Control Unit)
53
Troubleshooting
GSBC EPM-90 DTCS
- 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
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
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