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Unread 08-19-2013, 05:50 PM   #1
bobo49505
Registered User
1997 ZJ 
 
Join Date: Mar 2006
Posts: 7
last straw on p0720 error

Last wed i got a p720 error got the trans speed sensor put it in Friday after my grand Cherokees transmission got possessed the speedometer would go nuts and it couldn't decide what gear it wanted to be in.
So ive changed the trans speed sensor and pig tale , the speed sensor on the t case and pig tale and adjusted the kick down cable.
help what is left that's not in side the trans

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Unread 08-19-2013, 07:19 PM   #2
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,387
0720 is for transmission output sensor. it helps PCM control shift points. the reason you are getting the code is because the PCM is detecting a difference between the transmission sensor and a the vehicle speed sensor which the PCM reads to control the speedometer... that is going nuts on you.

time to chase a new problem. if you have 4wd, the VSS is on the transfer case.

Edit: I just noticed you already changed it. Check and clean PCM connections
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Unread 08-19-2013, 08:13 PM   #3
bobo49505
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1997 ZJ 
 
Join Date: Mar 2006
Posts: 7
ok ill try that in the morning

Last edited by bobo49505; 08-19-2013 at 08:15 PM.. Reason: over laped posts
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Unread 08-20-2013, 06:25 PM   #4
bobo49505
Registered User
1997 ZJ 
 
Join Date: Mar 2006
Posts: 7
well that dident work and its at the trans shop now
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Unread 08-21-2013, 04:56 PM   #5
bobo49505
Registered User
1997 ZJ 
 
Join Date: Mar 2006
Posts: 7
Back from the trans shop and i got REALLY lucky a wire on top of the trans had rubbed thru and was grounding on the case. cost $113 all labor
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