Possible reasons:
1. Torque converter malfunction:
* Wear of friction linings
*Clogged or oil leaking
* Damage to turbine wheel
2. Transmission problems:
* Worn or damaged clutches
* Malfunction of solenoids or control unit
*Low level or poor quality transmission oil
3. Fuel system:
* Clogged fuel filter
*Weak fuel pump
* Injector malfunction
4. Electrical system:
* Malfunction of the throttle position sensor
*Wiring problems
* Wheel speed sensor malfunction
5. Boost pressure:
*Turbocharger malfunction
* Intercooler clogged
*Leak in the boost system
6. Engine control system:
*Crankshaft sensor malfunction
*Camshaft sensor malfunction
* Problems with ECM software
Diagnosis and elimination:
1. Check the level and condition of the transmission oil.
2. Diagnose the transmission using a code scanner.
3. Check the fuel system for leaks and blockages.
4. Check the electrical system for wiring and sensor problems.
5. Check the boost system for leaks and blockages.
6. Connect a diagnostic tool to the ECM to check for trouble codes.
7. Eliminate any problems found.
8. Reset transmission and ECM adaptations after repair.
Advice:
If the diesel engine stalls not only when shifting into gear, but also in other situations (for example, when driving or idling), it is necessary to carry out a more complete diagnosis, including measuring fuel pressure, boost pressure and fuel injector operation.