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)
EPM internal electrical failure.
G
0x50BB16
20667
22
EPM2, PCL0 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50BB18
20667
24
EPM2, PCL0 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50BB21
20667
33
EPM2, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50BB22
20667
34
EPM2, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
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).
H
0x50BC12
20668
18
EPM2, PCL1 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50BC16
20668
22
EPM2, PCL1 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50BC18
20668
24
EPM2, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50BC21
20668
33
EPM2, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50BC22
20668
34
EPM2, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
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.
H
0x50BD12
20669
18
EPM3, PCL0 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50BD16
20669
22
EPM3, PCL0 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
Table 8 - Diagnostic Trouble Codes (DTCs)
24
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
0x50BD18
20669
24
EPM3, PCL0 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50BD21
20669
33
EPM3, PCL0 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50BD22
20669
34
EPM3, PCL0 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
0x50BD28
20669
40
EPM3, 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
0x50BE12
20670
18
EPM3, PCL1 Pressure
Sensor: Circuit Short To
Battery
EPM internal electrical failure.
G
0x50BE16
20670
22
EPM3, PCL1 Pressure
Sensor: Circuit Voltage
Below Threshold
EPM internal electrical failure.
G
0x50BE18
20670
24
EPM3, PCL1 Pressure
Sensor: Circuit Current
Below Threshold
EPM internal electrical failure.
G
0x50BE21
20670
33
EPM3, PCL1 Pressure
Sensor: Signal Amplitude
Less Than Minimum
EPM internal electrical failure.
G
0x50BE22
20670
34
EPM3, PCL1 Pressure
Sensor: Signal Amplitude
Greater Than Maximum
EPM internal electrical failure.
G
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.
H
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.
J
K
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.
L
0x50BF07
20671
7
Electro-Pneumatic Modulator
0: Mechanical Failures
The error is set if an EPM hardware fault is
detected.
M
0x50BF09
20671
9
Electro-Pneumatic Modulator
0: Component Failures
EPM internal electrical failure.
G
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.
N
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.
P
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.
Q
0x50BF25
20671
37
Electro-Pneumatic Modulator
0: Signal Shape / Waveform
Failure
The error is set if implausible voltage drop,
during valve activation, is detected.
R
Table 8 - Diagnostic Trouble Codes (DTCs)
SD-27-5031 Rev 001 Bendix® GSBC® EPM-90™ (Global Scalable Brake Control Electro-Pneumatic Modulator)
25
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
0x50BF29
20671
41
Electro-Pneumatic Modulator
0: Signal invalid
EPM internal electrical failure.
G
0x50BF56
20671
86
Electro-Pneumatic Modulator
0: Invalid / Incompatible
Configuration
The error is set if implausible voltage drop,
during valve activation, is detected.
S
0x50BF96
20671
150
Electro-Pneumatic Modulator
0: Component Internal
Failure
The error is set if test routines detect an
internal hardware error of the EPM.
T
0x50BF98
20671
152
Electro-Pneumatic Modulator
0: Component or System
Over Temperature
EPM PCB temperature exceeds the upper
threshold temperature (248°F / 120°C).
- 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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