Automatic transmission (AT) faults (Opel Astra H)

Note: Due to the complexity of the AT design, it is advisable to diagnose its faults and repair its components in a car service workshop.

57. General problems associated with the operation of the switching mechanism

1. The following can be attributed to failures associated with a violation of the adjustment of the shift rod:

• The engine can be started in transmission positions other than P and LG.
• The transmission position indicator reading differs from the actual gear selected;
• The vehicle is moving with the transmission in position P or N;
• Gears shift with difficulty or randomly.

2. Adjust the gear shift rod

58. The transmission slips, shifts with difficulty, makes extraneous noises, or does not allow the vehicle to move when shifted into one of the gears

1. There are many possible causes for the problems listed in the title, but only one of them falls within the competence of the amateur mechanic - the incorrect level of transmission fluid (ATF).

2. Before driving the car to the auto service workshop, check the level and condition of the ATF. Correct the ATF level or change it.

59. There are transmission fluid (ATF) leaks

1. ATF is dark red in color. Its leaks should not be confused with engine oil, which can be carried to the transmission housing by the oncoming air flow.



Text copied from a web portal opelbook.ru

2. To identify and locate the source of the leak, first remove all traces of dirt and grease from the transmission housing. Use a suitable degreaser and/or steam clean. Then drive the vehicle for a short time at low speed (so that traces of a leak are not carried away by the oncoming flow far from its source). Stop, jack up the car and visually inspect to determine the source of the leak. Most often, these are:

• Transmission Oil Pan - Tighten mounting bolts and/or replace oil pan gasket;
• ATF fill tube - replace the rubber seal where the tube enters the transmission case;
• ATF Lines - Tighten fittings or replace lines;
• Vent Tube - Transmission is overfilled and/or has water in it.

60. ATF is brown in color or smells burnt

1. ATF level is insufficient.

61. Kickdown mode does not activate when the pedal is fully pressed (the downshift does not engage)

1. The ATF level has dropped.

2. The engine management system is faulty.

3. The sensor switch or its wiring is faulty.

4. The selector drive cable is out of adjustment.

62. The engine does not start in any position of the selector or starts in positions other than "P" and "R"

1. The adjustment of the start permission switch sensor is disturbed.

2. The engine control system is not functioning properly.

3. The selector cable adjustment is incorrect.

63. Transmission slips, jerks or makes noise when shifting gears. Car does not move when "D" or "R" modes are engaged

1. The ATF level has dropped.

2. The sensor or its wiring is faulty.

3. The engine control system is not functioning properly.