Interpretation of diagnostic trouble codes of the Volvo FH12 engine control units with the D12A engine until 1998
See also:
- Fault codes of VOLVO FL10, F12, F16 with engines TD122, TD123, TD103, TD163
- Deciphering of Volvo FH Version 2 Fault Codes
Erasing registered faults
- Turn off the ignition for at least 10 seconds;
- Press and hold the ” Check Engine “;
- Ignition ON;
- Keep the ” Check Engine “about 3-4 seconds;
- 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.
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