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STEP 4: Blink Codes for Knorr-Bremse ABS 2x System ECU

  1. Use the table to identify ABS faults from the ECU Blink Codes recorded in STEP 3: Blink code identification and system response
  2. Links to solutions for common ABS faults can also be found below
  3. Please ensure all necessary Health and Safety precautions are implemented before commencing any repair work
  4. A list of useful ABS Diagnostic Tools is available on this website
  5. If you require further help or information, please contact us

Knorr-Bremse ABS 2x System ECU

Code Displayed

Location

Type of Fault

1st Digit

2nd Digit

1

1

No fault

2

1

Wheel speed sensor, front axle, left

Large air gap

2

2

Missing sensor signal at drive off

2

3

Damaged/contaminated tooth on exciter ring, long term ABS control

2

4

Long term instability

2

5

Loss of speed sensor signal

2

6

Shorted low/high or broken wire or two sensors shorted

3

1

Wheel speed sensor, front axle, right

Large air gap

3

2

Missing sensor signal at drive off

3

3

Damaged/contaminated tooth on exciter ring, long term ABS control

3

4

Long term instability

3

5

Loss of speed sensor signal

3

6

Shorted low/high or broken wire or two sensors shorted

4

1

Wheel speed sensor, rear axle, left

Large air gap

4

2

Missing sensor signal at drive off

4

3

Damaged/contaminated tooth on exciter ring, long term ABS control

4

4

Long term instability

4

5

Loss of speed sensor signal

4

6

Shorted low/high or broken wire or two sensors shorted

5

1

Wheel speed sensor, rear axle, right

Large air gap

5

2

Missing sensor signal at drive off

5

3

Damaged/contaminated tooth on exciter ring, long term ABS control

5

4

Long term instability

5

5

Loss of speed sensor signal

5

6

Shorted low/high or broken wire or two sensors shorted

8

1

Pressure modulator valve, front axle, left

Release solenoid shorted-high

8

2

Release solenoid shorted low

8

3

Release solenoid broken wire

8

4

Valve ground broken wire

8

5

Hold solenoid shorted high

8

6

Hold solenoid shorted low

8

7

Hold solenoid broken wire

8

8

Valve configuration error

9

1

Pressure modulator valve, front axle, right

Release solenoid shorted-high

9

2

Release solenoid shorted low

9

3

Release solenoid broken wire

9

4

Valve ground broken wire

9

5

Hold solenoid shorted high

9

6

Hold solenoid shorted low

9

7

Hold solenoid broken wire

9

8

Valve configuration error

10

1

Pressure modulator valve, rear axle, left

Release solenoid shorted-high

10

2

Release solenoid shorted low

10

3

Release solenoid broken wire

10

4

Valve ground broken wire

10

5

Hold solenoid shorted high

10

6

Hold solenoid shorted low

10

7

Hold solenoid broken wire

10

8

Valve configuration error

10

10

Pressure modulator valve, valve ground

Valve ground shorted-high

10

11

Valve ground shorted-low or internal defect

11

1

Pressure modulator valve, rear axle, right

Release solenoid shorted-high

11

2

Release solenoid shorted low

11

3

Release solenoid broken wire

11

4

Valve ground broken wire

11

5

Hold solenoid shorted high

11

6

Hold solenoid shorted low

11

7

Hold solenoid broken wire

11

8

Valve configuration error

15

1

ECU internal failures

Internal

15

2

Internal

15

3

EEPROM data error

15

4

Internal

15

5

Internal

15

6

Internal

15

7

Internal

15

9

Invalid configuration in EEPROM

15

10

Internal

15

11

Internal

16

1

Power supply

U-bat temporary over voltage

16

2

U-bat temporary low voltage

16

2

U-bat temporary low voltage during ABS control

16

3

U-bat broken wire

16

9

U-ign temporary over voltage

16

10

U-ign temporary low voltage

16

11

U-ign low voltage during ABS control

17

1

Retarder relay

Shorted high

17

2

Shorted low or broken wire

17

3

J1939 CAN datalink

Bus-off detected

17

4

Timeout or invalid data range on ERC1

17

5

Tyre size alignment

Front to rear out of range

17

10

Warning lamp

GND-WL shorted high or broken wire or WL shorted low or broken wire

17

12

Wheel speed sensors

Wheel speed sensor failure in previous 'power on' cycle

17

13

Wheel speed sensor on front axle or rear axle mixed up

17

14

Electronic brakeforce distribution (EBD)

Stop light switch defective

17

15

AoH booster

Booster switch defective

17

16

Booster defective

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