Hi everyone, first post but long time fan of the forumn. so recently my ML began experiencing the dreaded will not shift out of first problem. car only goes about 30-40 tops with high rpms (3000=30mph) with no shift. i did end up having to go around 40 and it was almost redlining. this is not a limp mode problem i dont think, as it was my understanding that limp mode would not allow the RPMs to get that high.
i have seen many many posts on this but am still kind of lost. took it to the stealership to get codes read and cleared heres what they came back with:
ETC- code 13 component Y3/6n3(speed sensor) is faulty,
ETC-code 109 component Y3/6n3 (speed sensor) is sporadically faulty.

there are a bunch of other codes but none look serious. could someone give me some direction here...from my research ive been seeing that this problem usually is due to a faulty ETC, speed sensor, MAF or even as simple as a battery voltage problem. before i start chucking money at new parts (car has ~245K on it) i want to know how deep im getting in. previoulsy have replaced transfer case maybe ~200K.


Thanks in advance for any and all help