Possible automatic transmission malfunctions in the absence of oil pressure:
Mechanical faults:
* Worn or damaged bearings, bushings and gears.
* Damaged oil pump.
* Clogged oil filter.
* Faulty oil pressure regulator.
* Damaged oil supply lines.
Electrical faults:
* Faulty oil pressure sensor.
* Faulty pressure regulator solenoid.
* Faulty automatic transmission control unit.
Hydraulic faults:
* Fluid leaks from seals, gaskets or pistons.
* Airing the system.
* Worn or damaged O-rings.
Symptoms of lack of oil pressure in the automatic transmission:
* Gear slippage.
*Hard gear shifting.
* Delay when changing gears.
* Automatic transmission overheating.
* Noise or vibration during automatic transmission operation.
Possible reasons for the lack of oil pressure in the automatic transmission:
* Low fluid level in the automatic transmission.
* Poor quality automatic transmission fluid.
* Contaminated fluid in the automatic transmission.
* Damage to mechanical components of the automatic transmission.
* Electrical faults.
* Hydraulic leaks.
Fault diagnosis:
* Checking the level and condition of the fluid in the automatic transmission.
* Using diagnostic equipment to read trouble codes.
* Checking the oil pressure in the automatic transmission using a pressure gauge.
* Visual inspection of the automatic transmission for leaks or damage.
Fault repair:
* Replace or repair faulty mechanical components.
* Repair or replacement of electrical components.
* Elimination of hydraulic leaks.
* Replacing the fluid and filter in the automatic transmission.
* If necessary, overhaul or replacement of the automatic transmission.