Starter went out and I left off the alternator wire off alternator to short out

Tiny
BILLY BIDWELL
  • MEMBER
  • 2007 CHRYSLER 300
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 168,582 MILES
Got new alternator put on and the wire back on the starter now I am in limp mode and CODE u0101 will not clear out
Friday, November 28th, 2025 AT 9:49 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It sounds like you may have shorted out a fuse or to, I would would by checking all fuses in both the inside on the under hood fuse panel. Also, would check the TCM electrical connector which can get water damage, so remove the connector to check for corrosion

Code U0101 (Lost Communication With TCM)

Here are the amin fuse to check

#14 - Transmission Control (20A)
#28 - PCM/TCM power
#6 - Ignition/Run (feeds multiple modules)

The TCM is under the dash on the drivers side. Please upload a short video in your response of the problem, so I can see what's going on :) Check out the images (below).
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, December 1st, 2025 AT 9:32 AM

Please login or register to post a reply.

Related Alternator Wiring Content

Alternator Replacement
VIDEO
Alternator Replacement
Instructional repair video
Alternator Replacement
GUIDE
Alternator Replacement
Got a red battery warning light on? This most likely means the alternator has gone out and needs a replacement. To confirm the failure use a voltmeter to test the alternator...
VIEW MORE