Possible malfunctions of the automatic transmission (AT) in the Kia Sorento:
1. Gear slippage
*Characterized by loss of power or slow shifting
*Causes: worn friction discs, clogged hydraulic unit, low ATF level
2. Hard gear shifting
* Sharp jolts or jerks when shifting gears
* Reasons: worn synchronizers, faulty hydraulic unit, failure of the electronic control unit (ECU)
3. Extraneous noise
*Buzzing, humming or howling noise when moving
*Causes: faulty bearings, worn gears, low ATF level
4. Fluid leak
* ATF leak from transmission
* Reasons: damage to gaskets, seals or automatic transmission housing
5. Gearbox won’t shift
* Automatic transmission does not shift to higher or lower gears
* Reasons: ECU failure, solenoids failure, mechanical component failure
6. Emergency mode
* The automatic transmission goes into emergency mode, limiting functionality
*Causes: overheating, low ATF level, sensor failure
7. Service
* Regular automatic transmission maintenance is recommended, including ATF and filter replacement
*Failure to perform proper maintenance may result in premature failure
Diagnostics and repair
To diagnose and repair Kia Sorento automatic transmission faults, it is recommended to contact an authorized service center or an experienced transmission mechanic. Diagnosis typically includes reading trouble codes, checking ATF levels and filter condition, and inspecting mechanical components and the hydraulic system. Repair may require replacing worn parts, repairing the hydraulic unit, or reprogramming the ECU.