Transmission will not go into reverse or drive when started

Hi,

When this happens, I need you to pay attention to something. Take note if the gear indicator is showing the selected gear. This vehicle has a transmission range sensor that is responsible for gear selection. If it is going bad, it may not be telling the different modules the correct gear. Make sure it shows D or R when they are selected.

Also, let me know if you have checked the transmission fluid to confirm it is clean and full. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

Since this doesn't happen all the time, I have a feeling it is an electrical issue or a pressure issue. Make sure to pay attention if the immobilizer light is on when it won't shift. I remember hearing that as well as a crankshaft sensor can be a cause. If so, then scanning the can-bus should indicate if there is a diagnostic code related.

CAN stands for controller area network. Basically, all the different computers/modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them. Here is a link explaining how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know.

Joe

Thanks Joe, for the quick reply. Today a code P0335 popped up on the scanner. You mentioned the crankshaft monitor sensor.
Would replacing that first be the start? All systems match my problems with the car. Hope that makes sense.

Hi,

That is where I would start. From what I have read, that is one of the possible causes. As far as replacing the sensor, since the code indicates an issue, there must be a problem related to it.

The sensor is right below the starter motor. When you remove it take your time. If there is evidence of corrosion, spray it with something like PB Blaster or WD-40. Let it soak a bit and then gently turn it back and forth while removing it.

When you reinstall it, make sure where it is seated is clean. Otherwise, damage to the new o-ring will likely result and you'll have a leak. Make sure to coat the new o-ring with engine oil before reinstalling it.

If you look below, the first picture shows the location of the sensor. The remaining pics are the directions for the removal and replacement of the part.

Let me know if this helps and how things turn out for you.

Take care,

Joe

See pics below,