Tip & How-To about 1988 Jeep Cherokee

My car does not shift in second gear.

Hi.

The first thing to do is replacing the transmission fluid. Metal debris inside the transmission box gets mixed with fluid and can cause similar problems.

The automatic transmission uses throttle position sensor to determine position and opening of throttle.
IF throttle position sensor is defective, the car may have problems shifting into one or more gears.

The automatic transmission is controlled by an electronic control module, that is energizing a set of solenoids to shift into gears.
The control module is a rectangular box, often located behind the dash and wired to transmission. The solenoids are attached to valve body,inside transmission.

If a solenoid is defective, or if control module is defective, the car may have problems shifting into one or more gears.

Problems concerning transmission control module, TPS and transmission solenoid are usually detectable reading fault codes stored on the car main control module (ECU/ECM).

Transmission problems are often returning a code p0700 after an OBDII scan.

Stored codes can be retrieved using an OBD scan reader.
If the car auto transmission is not shifting into gear, talk to the mechanic about the problem.
Only when the car has a really high mileage, or when there is a factory problem there is need to replace the gearbox.
A damaged gear box at low mileage is rather unusual.

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In the picture above the transmission oil pan was removed for oil filter replacement.

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9d86426.jpg

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