Possible reasons why the Honda CR-V RD1 automatic transmission stopped working:
Transmission problems:
* Worn or damaged clutches or steel discs
* Faulty torque converter
* Faulty gear selector
Hydraulic problems:
*Low or leaking transmission fluid
* Clogged oil filter
* Faulty oil pump
* Faulty solenoids
* Clogged hydraulic modulator
Electronics problems:
* Faulty speed sensor
* Faulty automatic transmission control unit
* Damaged wiring
Other reasons:
* Clogged transmission oil cooler
* Worn base plate or oil pan gasket
* Damaged output shaft splines
Diagnosis steps:
1. Check the level and condition of the transmission fluid.
2. Check the speed sensor.
3. Scan the automatic transmission for fault codes.
4. Check the hydraulic pressure using a pressure gauge.
5. Check the resistance of the solenoids.
6. Check the functionality of the torque converter.
7. Check the clutches and steel discs for wear.
Attention: To properly diagnose and repair the automatic transmission, it is recommended that you contact a qualified mechanic.