Code
15

16

20

21

22

23

Diagnostic Trouble
Code Description

Repair Information

J1939 Electronic Engine There is loss of communications between the Bendix ® ESP® EC‑80™ Controller and
Controller 3 Time‑out or the engine Electronic Control Unit (ECU) over the J1939 link. Check for damaged
or reversed J1939 wiring. Check for corroded or damaged connectors. Verify the
Invalid Signal
presence of engine ECU on the J1939 link. Verify the ECU configuration. Check
for other devices inhibiting J1939 communications.
There is loss of communications between the Bendix EC‑80 Controller and the
J1939 Electronic
Transmission Controller transmission ECU over the J1939 link. Check for damaged or reversed J1939 wiring.
Check for corroded or damaged connectors. Verify the presence of engine ECU
2 Time‑out
on the J1939 link. Verify the ECU configuration. Check for other devices inhibiting
J1939 communications..
Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
J1939 EAC1 Time‑out
or reversed J1939 wiring. Check for damaged or corroded connectors. Verify that
or Invalid Signal
the message is being transmitted. Verify data for Electronic Axle Controller 1 is
correct. Verify the ECU configuration.
Verify
60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
CAN Message
reversed
J1939 wiring. Check for damaged or corroded connectors. Verify that the
CGW_C1 Time‑out or
message is being transmitted. Verify that the data for differential lock(s) is correct.
invalid signal
Verify the ECU configuration.
Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
CAN Message
or reversed J1939 wiring. Check for damaged or corroded connectors. Verify that
ASC1_CLCS Time‑out
the message is being transmitted. Verify that the data for Air Suspension Control 1
or invalid signal
is correct. Verify the ECU configuration.
Verify
60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
J1939 CCVS Time‑out
reversed
J1939 wiring. Check for damaged or corroded connectors. Verify message
or Invalid Signal
is being transmitted. Verify the ECU configuration.

24

J1939 TCO
(Tachograph)
Time‑out

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged or
reversed J1939 wiring. Check for damaged or corroded connectors. Verify message
is being transmitted. Verify the ECU configuration.

26

J1939 Address Conflict
ABS Address

Verify only one ABS ECU is connected on J1939 bus, broadcasting OBh (equals
13 decimal).

27

J1939 Address Conflict
TPMS Address

Verify only one TPMS ECU is connected on J1939 bus, broadcasting 33h.

28

J1939 Proprietary XBR
Message Out of Range

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
or reversed J1939 wiring. Check for damaged or corroded connectors. Check for
messages being transmitted/received.

29

J1939 CAN Messages
Are Not Being
Transmitted/Received

Verify 60 ohms of resistance between X1 pin 7 and X1 pin 8. Check for damaged
or reversed J1939 wiring. Check for damaged or corroded connectors. Check for
messages being transmitted/received.

J1939 Troubleshooting Tests:

Cab-mount ECU:

1. Take all measurements at ECU harness
connector.

Looking into wire harness connector

2. Check for damaged or reversed J1939
wiring.
3. Check for corroded or damaged wiring
connector problems such as (opens or
shorts to voltage or ground).
4. Check for other J1939 devices which
may be loading down (inhibiting) J1939
communication.

X 4

Connector Pin J1939
X1
18 Way

7

J1939 Low

8

J1939 High

33

Troubleshooting Diagnostic Trouble Codes (DTCs): Miscellaneous
1st. Blink
Code 12
2nd.
Blink
Code

34

Location:
Miscellaneous
Diagnostic Trouble
Code Description

Repair Information

1

Stop Lamp Switch
Not Detected

The Electronic Control Unit (ECU) has not detected the presence of the stop lamp switch
since ignition power was applied (note that stop lamp switch input may be applied to
the Bendix ® ESP ® EC‑80™ Controller using either hard-wire input or J1939). Apply
and release service brake. Check for brake switch input into ECU (see system wiring
schematic). With service brake released, check for presence of the stop lamp bulb.
With service brake applied, verify system voltage is now present at the stop lamp switch
input to the ECU. Check for damaged wiring between ECU, stop lamp switch and bulb.
Check for corroded or damaged connectors. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors on J1939 link. Verify the presence
of engine ECU on the J1939 link. Verify the ECU configuration.

2

Stop Lamp Switch
Defective

Apply and release service brake. Check for brake switch input into ECU (see system
wiring schematic). With service brake released, check for presence of the stop lamp bulb.
With service brake applied, verify system voltage is now present at the stop lamp switch
input to the ECU. Check for damaged wiring between ECU, stop lamp switch and bulb.
Check for corroded or damaged connectors. Check for damaged or reversed J1939
wiring. Check for corroded or damaged connectors on J1939 link. Verify the presence
of engine ECU on the J1939 link. Verify the ECU configuration.

3

ATC or ESP Disabled
or Dynamometer Test
Mode Active

ATC or ESP is disabled. ECU has been placed in the Dynamometer Test Mode by either
the diagnostic Blink Code Switch or a hand-held or PC-based diagnostic tool. Clear
DTCs to exit Dynamometer Test Mode.

4

Retarder Relay Open
Circuit or Shorted to
Ground

Verify vehicle contains a retarder relay. Verify the ECU configuration. Check wiring
between ECU and retarder relay. Verify no continuity between retarder disable output of
Bendix ESP EC‑80 Controller and ground. Verify condition and wiring of the retarder relay.

5

Retarder Relay Circuit
Shorted to Voltage

Check wiring between ECU and retarder relay. Verify no continuity between retarder
disable output of Bendix ESP EC‑80 Controller and voltage. Verify condition and wiring
of the retarder relay.

6

ABS Indicator Lamp
Circuit DTC

Check operation of diagnostic Blink Code Switch. Check wiring of diagnostic Blink Code
Switch (verify ABS wire is not grounded where used) and ABS Indicator Lamp. Verify
ABS Indicator Lamp ground input. On some vehicles with multi-plex dashes, the ground
wire may not be present - see ECU 19 DTC.

7

PMV Common
Shorted to Ground

Verify no continuity between the Release, Hold and CMN of all Pressure Modulator Valves
(PMVs), Traction Control Valve (TCV), HSA, Diff Lock Solenoid and ground. Check for
corroded/damaged wiring or connectors between the ECU and CMN of all PMVs, TCV,
and Diff Lock Solenoid. See the extended troubleshooting for this code in Appendix A.

8

PMV Common
Shorted to Voltage

Verify no continuity between the Release, Hold and CMN of all PMVs, TCV, HSA, Diff
Lock Solenoid and voltage. Check for corroded/damaged wiring or connectors between
the ECU and CMN of all PMVs, TCV, and Diff Lock Solenoid.

9

ATC Disabled to
Prevent Brake Fade

The Bendix® ATC (Automatic Traction Control) system is temporarily disabled to
prevent excessive heating of the foundation brakes.

11

Wheel Speed
Sensors Reversed on
an Axle

Sensors are reversed (left to right) on one of the axles. Verify the proper installation,
connection, and wiring of the sensors.

14

Sensor CAN Supply
Voltage Error

Incorrect supply voltage for the Steering Angle Sensor (SAS) and the Yaw Rate sensor.
Verify the proper voltage at the sensor connectors. Verify the wiring between the ECU
and the sensors. Verify the proper output voltage from ECU. Note: When checking for
voltage at YAW/LAS & SAS, the voltage will only be present momentarily at key ON.

17

ABS disabled due to
off-road mode

The ABS indicator lamp will be flashing, indicating the ECU is in the off-road ABS mode.
Remove and re-apply ignition power.

19

Maximum number
of PMV cycles
exceeded

Replace all PMV valves and clear the DTC.

2nd.
Blink
Code

Diagnostic Trouble
Code Description

Repair Information

20

Maximum Number
of TCV Cycles
Exceeded

22

ESP Sensor Voltage
Out of Range

Incorrect supply voltage is detected for the Bendix ® SAS-60™ and the Yaw Rate sensor.
Verify the proper voltage at sensor connectors. Verify wiring between the Electronic
Control Unit (ECU) and the sensors. Verify the proper output voltage from ECU.
Note: When checking for voltage at YAW/LAS & SAS, the voltage will only be present
momentarily at key ON.

24

HS Feature Lamp
Open or Shorted
to Ground

Verify no continuity between the Hill Start / Hill Start Assist lamp and ground. Verify
continuity between the lamp and the ECU. Check the wiring between the lamp and the
ECU. Check the lamp and the condition of its wiring.

25

HS Feature Solenoid
Open or Shorted
to Ground

The Hill Start / Hill Start Assist solenoid is shorted to ground or has a broken wire. Verify
no continuity between the solenoid and ground. Check for corroded/damaged wiring or
connectors between the ECU and the solenoid.

26

HS Feature Solenoid
Shorted to Voltage

Verify no continuity between the Hill Start / Hill Start Assist Solenoid and voltage. Check
for corroded/damaged wiring or connectors between the ECU and Solenoid.

27

Brake Lamp Input
Mismatch With Brake
Lamp Output

There is a brake lamp input mismatch with the brake lamp output.

Replace all Traction Control Valve (TCV) valves and clear the Diagnostic Trouble Code
(DTC).

28

Air system/
Mechanical
Component

Verify brakes are operating correctly. Verify that there is not over-braking at one or more
wheel end(s). Check the pneumatic plumbing and the exhaust port of the PCVs, TCVs,
and relay valves and confirm that the air is being exhausted from all brake chambers.
Verify tire sizes on the vehicle match the ABS ECU configuration. Verify wheel speed
sensors and tone ring are properly adjusted and in good condition.

29

Air system/
Mechanical
Component

Verify that the tires are in good condition. Verify that no pneumatic hoses are twisted
or kinked. Verify that the brakes are operating correctly. Verify that the wheel speed
sensor and tone ring are properly adjusted. Verify tire size.

30

ESP Disabled due to
Off Road Mode

Electronic Stability has been disabled due to the vehicle being in the ABS or ATC off
road mode. Cycle ABS Off Road or ATC Mud snow switch.

31

HS Feature Lamp
Shorted to Voltage

Verify that there is no resistance measured between the battery and HSA lamp output
of the ECU. Check the wiring between the ECU and the Hill Start / Hill Start Assist
lamp. Check the lamp and condition of its wiring.

32

I/O 2 or 3 Shorted
High (EC‑80-ATC)
OR
I/O 2 or 3 shorted
High or Stop Lamp
Output error (ESP
EC‑80)

Check for a short-circuit condition between voltage and the I/O 2 and I/O 3 circuits.

33

HS Feature Solenoid
Open Circuit

Verify resistance across the Hill Start / Hill Start Assist solenoid. Check the ECU and
HSA solenoid for corroded or damaged wiring and/or connectors.

34

eTrac Valve Solenoid
Shorted to Voltage

Verify the resistance between voltage and the Bendix ® eTrac™ solenoid is open. Check
for corroded or damaged wiring or connectors between the ECU and the eTrac solenoid.

35

eTrac Valve Solenoid
Shorted to Ground

Verify the resistance between ground and the Bendix eTrac solenoid is open. Check for
corroded or damaged wiring or connectors between the ECU and the eTrac solenoid.

36

Reserved

Reserved

38

Invalid ABS Warning
Lamp Configuration

Check X1-12 if pin/wire installed. X2-12 should have no terminal or connection. ABS
Warning Lamp is controlled via J1939.
35

Troubleshooting Diagnostic Trouble Codes (DTCs): ECU
1st. Blink
Code
13

Location:
ECU

2nd
Blink
Code

36

Diagnostic
Trouble Code
Description

Repair Information

(With HEX
designation)

1

ECU DTC (5FC)

2

ECU DTC (5CD)

3

ECU DTC (10)

4

ECU DTC (2678C)

5

ECU DTC (1C)

6

ECU DTC (6CD)

7

Configuration
mismatch

8

ECU DTC (56)

9

ECU DTC (CAC3)

10

ECU DTC (5F3)

11

ECU DTC (F1A)

12

ECU DTC (F14)

13

Configuration
mismatch

14

ECU DTC (C6)

15

ECU DTC (CF)

16

ECU DTC (C0)

17

ECU DTC (C8C)

18

ECU DTC (CC)

19

ECU DTC (63)

20

ECU DTC (6E)

21

ECU DTC (6C)

22

ECU DTC (63C)

25

ECU Internal VIN
Mismatch

The ECU internally-stored VIN does not match the VIN of the vehicle.
Ensure that the ECU is installed on the correct vehicle. Verify the
ECU programming. Verify engine programming.

26

Valve Configuration
Mismatch

Check for damaged or corroded connectors. Check for damaged
wiring. Clear DTCs. If DTCs return, contact the Bendix Tech Team
at 1-800-AIR-BRAKE (1-800-247-2725, option 2, then 1) for further
troubleshooting assistance.

28

ECU DTC (7CD)

29

ECU DTC (5D)

Check for damaged or corroded connectors. Check for damaged
wiring. Clear Diagnostic Trouble Codes (DTCs). If DTCs return,