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Don's GC 08-22-2011 11:41 AM

Low spare Warning
The low spare tire pressure warning comes on (2008 Grand Cherokee) at startup on the EVIC. All of the other tires read the proper pressure. I dropped the spare and some one had 48 pounds of air in the full size spare. They may of been trying to turn off the warning. I lowered the spare to the 33 psi on the label, but still get the low spare warning after driving the Jeep all weekend. Does this system have a reset or anyway to cause the system to turn off the warning. Or is the TPMS sensor in the spare just gone bad.

ganderelli21 09-01-2011 06:58 PM

Re: Low spare Warning
I'm having the same issue with my 06 Grand Cherokee. I replaced the spare sensor with a cheaper aftermarket that they claim will work fine with the TPMS on the Jeep.
After driving around a little, the message of spare low pressure and service press system warning came back on, so I dont know whats going on.

Crestwood1001 09-01-2011 07:27 PM

Does my 05 have a low spare warning?? Haha

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lll2for3lll 09-01-2011 07:33 PM

Re: Low spare Warning
My light has been on since shortly after I bought it. Lol.

TurboDiesel 09-01-2011 07:45 PM

Re: Low spare Warning
i didnt even know there was a warning light just for the spare..

my low tire pressure light is on and every tire is at 33psi, didnt bother checking the spare cause i never had a problem till i put these wheels on....could it be that my spare is my stock tire and my mounted tires are different?

i just kinda ignore the lightlol

Chaoul1 09-01-2011 08:39 PM

Re: Low spare Warning
My light came on for the first time in a while. It came on last week. I think it dropped because of the temperature drop? I'm taking my tires to Costco anyway to have them rotated. I'm going to ask them to Fill my Spare back up. All my tires dropped PSI's. My fronts read 32PSI and my rears read 31PSI LOL

Crestwood1001 09-01-2011 09:19 PM

Re: Low spare Warning
I dont have it for my 05' I have not had a spare under it for two months and the only light I have is the normal air light cause I dont have TPMS anymore...

dr.lee.baugh 09-02-2011 07:54 AM

Re: Low spare Warning
My low spare warning came on after installing a new TPM on a separate wheel. Checked the pressure of the spare and it was fine.

Brought it back to the dealership where the TPM was replaced and they said it should go out after a few drive cycles.

After a week of the light remaining on I took it back, and they whisked away the Jeep came back half an hour later. The light was still on and they said that they had reset things, and it should go out after a few drive cycles.

Light stayed on for 3 weeks, ended up having to take it back to the dealership one more time, this time spoke with service manager. They took it away, back 5 minutes later, light was out. He said he has no idea what the other technician was doing before, it was a simple reset.

Of course, the first thing that I did when I got home was dropped the spare and let out the air to make sure they just didn't disable the system. Sure enough, light comes on when it was low and turned off when I re-inflated.

Since they were the ones that installed the TPM, there was no charge for (eventually) fixing this, but I'm guessing they would charge the same as flashing the PCM if you have to take it in.

Not sure if any of that applies to your ride, but there certainly does seem to be some calibration/reset that they can perform...or at least some of their technicians can perform :lol:.

Good luck!

Don's GC 09-02-2011 11:23 AM

Re: Low spare Warning
I got around to taking the Jeep in to fix the low spare warning. I could not find out what to do to the system myself. The service manager said on some cars you have to hook up the scanner and dismount the tire and get the code off the tpms sensor that is your spare and manualy enter the value into the tpms computer with the scanner. I don't know if that is what they done of if the system relearned without tire dismounting. Anyway $95.00 later the light is out and I hope everything is back to normal. Now this week I have a MIL light coming on with a code for small emissions leak. I reset that myself with my scan tool and replaced the fuel cap. If that light comes back on I will be having to give the dealer more money. I should buy an old XJ and drive it into the mud and forget about warning lights.

2005JGC 09-02-2011 01:46 PM

Re: Low spare Warning
There is a miller special tool that is a TPM/RKE tester that will test each sensor and pull the part number. Unfourtunatly with this being a wireless system its impossible to diagnose a fault without the ability to see what the modules see. So long as your tires are filled to spec then that is about as far as you can go on your own unfourtunatly.

Good news, if you want to spite the dealers you can go catch a tool truck somewhere and order a tpm tester kit... IIRC about 700-900 dollars later you can lift your head high knowing that you have not had to pay the man... unless you dont find anything with the kit and you need a module reset with the witech then its back to the dealer ;)

Crestwood1001 09-02-2011 09:16 PM

Re: Low spare Warning
LOL id rather just pay them a few hundo vs. spending 700 on a tester id use one time.

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