The transmission shift solenoid’s job is just like it sounds – it basically shifts the gears for you. You can read more about it here: Limp mode. Mostly limp mode causes the transmission to not shift over gear 3, and if there is a bad shift solenoid, it may cause limp mode of your car. Limp mode is a protection function for your engine, and you will notice it mostly because your engine will get an RPM limit of 2500-3000 RPM, and it may also affect your transmission shifting. This can cause hard shifting or shiftings at too low or too high RPM, for example. You may also have intermittent problems with the transmission shift solenoid, which will cause shifting problems. If this is the case, you can either try to give the shift solenoid external power to release the gear if you know how to do it. If the shift solenoid got damaged while the gear was engaged, it might cause the transmission to be stuck in that gear. This is a big sign that you have transmission shift solenoid problems because you have one or more shift solenoid for each gear, and if one is broken, it will not shift to that gear – instead, jump to the next gear directly.
You may also notice that your car may have a problem engaging some gears, and therefore it will skip to the next gear. This applies to both upshifting and downshifting. If the transmission control unit recognizes any shift solenoid problems, it may cause the transmission to shift very slowly. Most cheaper ones can only read the codes from the engine control module. To read the trouble codes from the transmission control module, you need an OBD2 scanner to read generic and enhanced trouble codes. If this light is on, it might be a stored trouble code related to a bad transmission shift solenoid.
Some cars do also have a separate transmission warning light. This code basically tells you that there is a problem with the transmission control, and more trouble codes will be found in the transmission control module. Mostly it lightens up, and you will see a P0700 Trouble code. The check engine light will light up even when there is a problem with the transmission. The first sign you will notice of all bad shift solenoid symptoms is probably the check engine light. Common Shift Solenoid Trouble Codes Bad Transmission Shift Solenoid Symptoms 1.
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