Error codes of the Volvo FH12 engine control units before 1998

By | 23/11/2018

Interpretation of diagnostic trouble codes of the Volvo FH12 engine control units with the D12A engine until 1998

See also:

Volvo D12A engine fault codes

Volvo D12A engine

Erasing registered faults

  1. Turn off the ignition for at least 10 seconds;
  2. Press and hold the ” Check Engine “;
  3. Ignition ON;
  4. Keep the ” Check Engine “about 3-4 seconds;
  5. Release the button.

Registered codes in the memory of the engine control unit will be erased and will not appear until a fault appears.

List of error codes for Volvo D12A engines

Error code 11

Code

eleven

Headline

Accelerator pedal sensor.

Malfunction

Accelerator pedal sensor defective or wiring between engine control unit and pedal damaged. If you do not fully press the accelerator pedal, a sharp increase in engine speed may occur.

Error code 12

Code

12

Headline

Accelerator pedal idle switch.

Malfunction

Accelerator pedal sensor defective or wiring between engine control unit and pedal damaged. The accelerator pedal does not respond to pressing.

Error code 13

Code

13

Headline

Car speed signal.

Malfunction

Damaged wiring, faulty instrument cluster, faulty tachograph. Cruise control does not work while the DTC is active.

Error code 14

Code

14

Headline

Relay power supply control unit engine.

Malfunction

Faulty relay or damaged wiring.

Error code 21

Code

21

Headline

Internal malfunction of the engine control unit.

Malfunction

Faulty engine control unit. Cruise control does not work.

Error code 22

Code

22

Headline

Software error in the engine control unit.

Malfunction

The engine control unit is not programmed or programmed with errors. The engine will not start.

Error code 23

Code

23

Headline

Coolant temperature sensor.

Malfunction

The sensor is faulty, wiring is damaged, the water pump is working with incomplete efficiency, the radiator cells are clogged or the thermostat is faulty.

Error code 24

Code

24

Headline

Injected air temperature.

Malfunction

Sensor is defective, wiring is damaged, cells of intercooler ( intercooler ) are clogged , mechanical failure of the engine. At a temperature of forced air above 91 ° C, the lamp ” Check Engine “lights steadily, and the engine power will be reduced. In the case of a fault in the wiring harness or faulty lamp” Check Engine “will blink.

Error code 25

Code

25

Headline

Air pressure.

Malfunction

Sensor defective, wiring damaged, turbocharger defective, intercooler damaged or clogged, mechanical engine failure. Reduced engine power, increased exhaust emissions.

Error code 26

Code

26

Headline

The camshaft speed sensor.

Malfunction

The camshaft speed sensor is faulty, wiring is damaged, and the synchronization between the signals from the camshaft speed sensor and the crankshaft rotation sensor is broken. In case of a synchronization failure, codes 26 and 27 will be active at the same time. The engine starts a long time or may not start the first time.

Error code 27

Code

27

Headline

Crankshaft speed sensor.

Malfunction

The crankshaft speed sensor is faulty, the wiring is damaged, the timing between the signals from the camshaft speed sensor and the crankshaft rotation sensor is broken. In case of a synchronization failure, codes 26 and 27 will be active at the same time. The engine starts a long time or may not start the first time.

Error code 31

Code

31

Headline

Pump-nozzle cylinder number 1.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault. The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Error code 32

Code

32

Headline

Pump-nozzle cylinder number 2.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault. The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Error code 33

Code

33

Headline

Pump-nozzle cylinder number 3.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault. The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Error code 34

Code

34

Headline

Pump-nozzle cylinder number 4.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault. The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Error code 35

Code

35

Headline

Pump-nozzle cylinder number 5.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault. The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Error code 36

Code

36

Headline

Pump-nozzle cylinder number 6.

Malfunction

The injector pump is faulty, the wiring between the engine control unit and the injector pump is damaged, and the motor has a mechanical fault . The engine does not work smoothly, it is possible to increase the opacity of the exhaust gases.

Information code 41

Code

41

Headline

Brake check failed or brake pedal sensor defective.

Malfunction

Cruise control and the “RESUME” function do not work.

Information code 42

Code

42

Headline

An active signal on the lamps, warning about braking.

Malfunction

The signal to the lamp interrupts the operation of the cruise control and prevents the installation of a constant engine speed for power take-off.

Information code 43

Code

43

Headline

Active signal from the brake pedal sensor.

Malfunction

The signal from the sensor interrupts the operation of the cruise control and prevents the installation of a constant engine speed for power take-off.

Information code 44

Code

44

Headline

The accelerator pedal idle switch is active (the accelerator pedal is fully depressed).

Malfunction

Information code 45

Code

45

Headline

The contact of the clutch pedal is open (the clutch pedal is partially or fully depressed).

Malfunction

The signal from the clutch pedal interrupts the operation of the cruise control and turns off the manual constant speed of the engine.

Information code 46

Code

46

Headline

The signal from the parking brake is active.

Malfunction

The signal is a condition of the possibility of manually setting a constant engine speed for power take-off.

Information code 47

Code

47

Headline

The safety signal is active.

Malfunction

When the safety signal is active, the engine does not react, the engine is forced to idle at a speed of 0 km / h or the engine is turned off (depending on the safety modes programmed in the engine control unit).

Information code 51

Code

51

Headline

Cruise control included.

Malfunction

The signal from the cruise control switch is a prerequisite for cruise control and the ability to manually set a constant engine speed for power take-off.

Information Code 52

Code

52

Headline

The active signal from the “ON” and “SET” buttons on the cruise control switch.

Malfunction

When the vehicle is moving , cruise control is activated. When the vehicle is stopped, the ability to manually set a constant engine speed for power take-off is activated .

Information code 53

Code

53

Headline

Active signal from the “ON” and “RESUME” buttons on the cruise control switch.

Malfunction

During movement the speed set earlier is resumed. When the car is stopped, the engine speed increases or decreases to approximately 1000 rpm.

Information code 61

Code

61

Headline

Active ABS signal.

Malfunction

The engine brake (VEB) is not functioning.

Information code 62

Code

62

Headline

Communication with the Geartronic gearbox control unit .

Malfunction

If no signal is present Geartronic is not functioning.

Information code 63

Code

63

Headline

Active signal VSP (engine control unit is in programming mode).

Malfunction

The engine will not start.