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Topic Review (Newest First)
03-16-2014 05:10 PM
08beast
Sporadic starting

So my '08 Jeep Wrangler Unlimited began starting only when it felt like it. One day it would start with no issues and then the next time I would go to fire him up and nothing! The dash would light up and everything seemed normal, until I turned the key...click and nothing. Wiggling the shifter lever was all it took to get my Jeep to fire up again. Obviously the sensor in the transmission is acting up, but at least I know it's nothing like a bad starter or ignition.

So if your jeep starts one time and not the next, wiggle the shifter or shift from park to neutral and back......bang! Your jeep will fire up.
10-30-2013 06:43 PM
MikeVick
Quote:
Originally Posted by Mossman View Post
I can only repeat what I said last year - install the grounding straps before you tear apart your tranny. As an update, since doing this over a year ago I have had no return of the problem.
OK. I gotta try the ground straps.

-Starter problems (neutral works replaced starter first waste of $)
-Remote entry and remote start does not work (neither key)
-When I lock door and open with key the horn sounds (like the alarm)
-Airbag light stays on (dealer said its clock spring, Some 2008 recalled in 2011)

I read where the electrical system runs through the clock spring.

Did you have all the above issues?

Thanks.
07-30-2013 11:05 AM
Ricci Hamilton
Quote:
Originally Posted by Ricci Hamilton View Post
I have replaced the Battery and starter and the failure to start still comes and go's, I get the click. I purchased the SNS from Napa but I am trying adding another ground cable from and negative Battery post to the Transmission housing, so far today my Wrangler starts first time every time. I will see if this has solved the start issue for the next week before trying to change the position switch in the Trans. From what I have read it looks like this requires draining the trans. fluid, removing the pan and valve body assembly to access the switch. I will post my results.
This issue has not returned, the Ground strap fixed my problems.
07-22-2013 07:44 AM
Ricci Hamilton
Quote:
Originally Posted by Mossman View Post
I can only repeat what I said last year - install the grounding straps before you tear apart your tranny. As an update, since doing this over a year ago I have had no return of the problem.
Thanks....I installed the ground cable and the failure to start seem to be gone.
07-19-2013 04:35 AM
Weecee I've replaced battery as well. How hard and how long did it take to change out the switch?
07-18-2013 10:22 AM
nwbronco Could be, could be the battery too. But most likely is the other issues discussed. The charging system can be checked with a voltmeter.

Bob K.
07-18-2013 10:09 AM
JenyGirl
Quote:
Originally Posted by Ironic View Post
I have a 2007 JK Auto it has happened atleast a dozen times, if I jiggle the shifter it starts right away. It has not occured in the last month ... pretty random. I checked & all the electrical connections & switches they seem o.k.
07. Had this issue for 3yrs now... Replaced battery... Sometimes it takes 4x's to turn over.. Wouldn't this indicate an alternator going bad?
07-18-2013 09:40 AM
Mossman I can only repeat what I said last year - install the grounding straps before you tear apart your tranny. As an update, since doing this over a year ago I have had no return of the problem.
07-18-2013 09:39 AM
Ricci Hamilton
Quote:
Originally Posted by Ricci Hamilton View Post
Does anyone Know how to replace the SNS on an automatic transmission
I have replaced the Battery and starter and the failure to start still comes and go's, I get the click. I purchased the SNS from Napa but I am trying adding another ground cable from and negative Battery post to the Transmission housing, so far today my Wrangler starts first time every time. I will see if this has solved the start issue for the next week before trying to change the position switch in the Trans. From what I have read it looks like this requires draining the trans. fluid, removing the pan and valve body assembly to access the switch. I will post my results.
07-18-2013 09:03 AM
Ricci Hamilton
SNS cost

Quote:
Originally Posted by Weecee View Post
I too am now a vitim of the Jeep flu. Intermitent starting. Mine is a 2008 auto wrangler. Usually takes 3 tries but when shifting out of park and back to park with the key on only does it once. Any new info on this? And if i do go to get the switch or sensor in the transmission replaced any ideas how much it'll cost?
I purchased the switch from Napa $ 38.30
07-17-2013 07:21 AM
Ricci Hamilton
Replace SNS on Wrangler X 2008

Does anyone Know how to replace the SNS on an automatic transmission
07-17-2013 04:55 AM
Weecee
Starting issues

I too am now a vitim of the Jeep flu. Intermitent starting. Mine is a 2008 auto wrangler. Usually takes 3 tries but when shifting out of park and back to park with the key on only does it once. Any new info on this? And if i do go to get the switch or sensor in the transmission replaced any ideas how much it'll cost?
06-12-2012 09:29 PM
joe002
Quote:
Originally Posted by repauli1 View Post
...neutral ALWAYS WORKS FOR ME

If you are out of warrantee then that is the "free" method. If it starts to get intermittent you can try Park to Neutral then back to Park again - I had to do that a few times.


Quote:
Originally Posted by McconnellSilva View Post
I took it into the dealership and they couldn't find or replicate the problem...

If you have the standard "click no start" problem then there aren't any codes thrown, and when it's not stuck it tends to fire right up, so it's hard to diagnose. I told my dealer about it and they said that based on my description they would just go ahead and replace the TRS (under warrantee), which fixed my problem.
06-12-2012 09:06 PM
repauli1
Quote:
Originally Posted by jmb6420
Next time it happens, put it into neutral and try. Bet it's the safety switch not detecting the shifter in 'park' all the time.
I have same issue in 2008, dealer said bad shifter cable, I say WTF? I think park sensor.

Ps, neutral ALWAYS WORKS FOR ME
06-12-2012 08:07 PM
JEEPDON Mine is a 2010 with 6 speed manual; started acting up a while back not starting intermittently-- today, it would not crank at all, gave it a pull and bumped clutch- it fired right up. Still will not crank under its own power.
Tried jumping solonoid while holding key in start position and it fires right up. I think it will be hauled to dealer on friday. Whatever the outcome; I think there will be an emergency starting system installed after this.
06-12-2012 07:15 PM
Mossman I had the same problem. There seems to be two main reasons for the click-no-start issue (apart from a dying battery, that is). The first is a problem with the ignition key sensing module which can be affected by static discharge from the key. You can check this by waiting until the problem occurs, then pulling the IOD fuse, waiting 15 seconds and reinstalling. If this fixes the problem, you need a new CSM module (another clue that the CSM is at fault is if your remote-access door locks don't work when the engine won't start). This is a few hundred bucks.

If the CSM isn't at fault, the second main possible cause is with the transmission range sensor. If the condition is at all dependent on the position or if wiggling the auto shift lever while starting seems to help, then the TRS is erroneously locking out the ignition by signalling that the shift lever isn't in P or N, when it is. Fortunately fixing this usually doesn't require replacement of the sensor, which is an involved job. Rather the problem is with the sensor's ground, and as other have said you can install some redundant ground straps to solve the problem. Just take an 8 gauge or better wire from the engine block to the battery negative, and for good measure you can also run one to the alternator and to the transmission bell housing. When this is done, make sure to charge your battery. This seems to work for almost everyone.

After two weeks of a frustrating runaround (the dealer, bless its stupid heart, replaced the starter, a useless exercise), I stumbled upon the ground solution described on this and other forums. Problem has not recurred since.
06-02-2012 11:41 AM
joe002 If he wants to try something a little more simple then he can try to run the good ground from the battery, to the body, to the engine, to the transmission. It may work - it has for some others.
06-02-2012 11:37 AM
joe002
Quote:
Originally Posted by keltastic1 View Post
Does anyone know where the TRS is located, my husband wants to replace it. I looked online, but can't find a Diagram.
Yes. Unfortunately it's not an easy fix.

It's located inside the transmission under the valve body.
06-02-2012 05:16 AM
keltastic1 Does anyone know where the TRS is located, my husband wants to replace it. I looked online, but can't find a Diagram.
06-02-2012 03:18 AM
odimodus My old 08 (traded, but not cuz of problems) did that a few times. Unhook one of the leads off the battery and reconnect. The horn will honk once when battery is reconnected and the jeep always started right up after that. Seriously, worked every time for me and it's a simple fix, but it is a pain in the arse.
06-01-2012 03:53 PM
joe002
Quote:
Originally Posted by keltastic1 View Post
It happened to me just a few minutes ago. Thank you, putting it in N worked!
Cool. N worked for me for a while and when that started to get intermittent I tried P to N to P to start it - anything to move the TRS. I've read where some never really fix it but just keep moving the shifter...
06-01-2012 02:58 PM
keltastic1 It happened to me just a few minutes ago. Thank you, putting it in N worked!
06-01-2012 01:55 PM
keltastic1 I'm having this same problem. I was thinking it may have something to do with the key, but my spare, which is just a plain key that's doesn't have the buttons did it to. I hope this solves our problem, because it not fun being stuck some were for 20 minutes or more till it decides to start.
05-31-2012 07:22 AM
pkmcd99 The infomous Jeep Flu. Affects all jeep models since the transmissions and ignitions got all fancy electrical gadgets. Good luck. Hopefully its just one sensor. Commanders have been plagued by similar issues which dealers have now snickered and called Jeep Flu because the problem acts like one sensor malfunction but turns out to be others such as temp sensors, theft lock issues from chipped key...etc
05-31-2012 07:09 AM
rgiand71 OK, It happened again , finally!!!! Got in the Jeep and turned the key and nothin... just click, click. all lights were on but no start!! so I tried it.. I just jiggled the shifter & turned the key and YES!!! it started... good to know that it worked. Now to tell the deal sometime & see what they will do about it..
05-26-2012 03:18 PM
joe002 The “click no start” problem is well documented and has been around for a long time. If you have an automatic, and when you try to start it you hear a click and the engine doesn’t start, try shifting to Neutral and see if it starts. If it does you have the “classic” symptoms.

The problem is that your Transmission Range Sensor (like a fancy Neutral Safety Switch) is acting up. There are three solutions:

1. No cost (usually works): When it happens, shift to Neutral and start it up.

2. Low cost (may fix it): Make a new really good ground from your battery, to the body, to the engine, and then to the transmission. This solution has worked for some.

3. High cost (seems to fix the problem): Get a new Transmission Range Sensor installed. The TRS is inside of your transmission and requires a bit of work to replace it.

I had this problem and brought it to the Dealership. The told me that they tried the ground fix and it worked for many but some retuned as it didn’t totally fix it. They said when they replaced the TRS it always worked. I have an extended warranty so they replaced the TRS for free and I haven’t seen the issue again.
05-26-2012 01:39 PM
Dylanjwhall Did that in my 12, finally it wouldn't start, then was towed. they replaced my starter and all was good in the world again
05-26-2012 12:07 PM
rgiand71 It happens to mine as well... Dealer couldn't re-create the problem and had no explination. Hasn't happened recently to verify it to be the shifter but Iam deffinitely gonna try messin with the hifter next time..
05-26-2012 11:38 AM
jmb6420 Next time it happens, put it into neutral and try. Bet it's the safety switch not detecting the shifter in 'park' all the time.
05-26-2012 10:34 AM
Ironic I have a 2007 JK Auto it has happened atleast a dozen times, if I jiggle the shifter it starts right away. It has not occured in the last month ... pretty random. I checked & all the electrical connections & switches they seem o.k.
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