JEEP JK TRANSMISSION QUESTION

[AC77]

Hello, everyone, i know this is a JL forum , im attempting to solve an issue via video calls and texts for my very good friend in Florida , and im in Los Angeles on his 15 JK< stuck in 1st gear and will not shift, they have done the following per my suggestions and research

replace transmission oil and filter - Still the same
Replaced front left and right speed sensors - still the same
ABS control module code , i told them to buy the controller only and replace it ( black box with connected under the ABS unit ), ive been on this with them on the phone for over a week and i know we can solve the issue

had them check the battery and charging system , and all checked good

current codes =

B1644
U0121
P2096
P0137
C2200
C1015
C1020
C2100
C2102
P501

i would high appreciate it Big time for any input at all

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[GATORB8]

That's a Christmas tree of codes, I'm voting electrical. I'd check ground continuity on the major ground points.

Stuck in first, do you mean the shifter, or it won't shift in drive? Meaning you can still get park, neutral, rev.

 

[AC77]

That's a Christmas tree of codes, I'm voting electrical. I'd check ground continuity on the major ground points.

Stuck in first, do you mean the shifter, or it won't shift in drive? Meaning you can still get park, neutral, rev.

yes sorry, it doesn't upshift when in Drive

 

[AmericanPatriot100]

TCM? I had a bad TCM in my grand Cherokee and it auto shifted the transfer case into 4Low blew up the transfer case and transmission. Would only go into 1st gear. I don’t remember the codes. But the dash had all the service xxx light on. Mechanic replaced transmission and transfer case first reset codes and same problem but this time only the TCM code popped up so replaced TCM everything was fixed.

 

[kah.mun.rah]

Do they have it in the manual 1st gear? If so, watch this video to put it back into normal Drive:

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