Jeep tire pressure sensor question-help? - Team Camaro Tech
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post #1 of 12 (permalink) Old Dec 27th, 12, 10:55 AM Thread Starter
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Jeep tire pressure sensor question-help?

My daughter has an '06 Jeep Liberty and the unit seems to be sending warnings of low pressure. Is this a weak point in the Chrysler line...or is it a point of weakness of these sensors in general? I've never had much to do with these things.

To date, she's had it into the dealer, and they've taken off a tire replaced it with the spare, put in a new valve in the tire that is now a spare. But the low pressure light she says is back on.

I'd hate to see her ending up with a big bill putting in a new computer part. Guess I'm used to using the old tire gauge and checking out the pressure myself. She will definately have one by the end of the day!

So, guess I'm asking:

Do these electronic devices "screw up" much?
Usually how much pressure loss turns on these sensors?
Can the low pressure light be cancelled out with a scanner?
What would you suggest?

capt
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post #2 of 12 (permalink) Old Dec 27th, 12, 11:20 AM
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Re: Jeep tire pressure sensor question-help?

Is the light on steady or flashing. On some steady indicates a low or high pressure warning and flashing indicates a bad sensor or system fault.

With the onset of winter it's likely to be moisture, debris or mud and snow interfering with the reading of the sensors. Sometimes they work fine but all too often (doesn't matter brand) they are a pain in the butt.

Here's general info; http://en.wikipedia.org/wiki/Tire-pr...itoring_system

Google your make and model along with tire pressure sensor and you'll find plenty of related info...

...Dennis

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post #3 of 12 (permalink) Old Dec 27th, 12, 12:09 PM
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Re: Jeep tire pressure sensor question-help?

The sensors do fail sometimes. They do give a warning when the pressure goes below the recommended tire pressures. The owners manual gives the procedure for re-calibrating them, pretty easy. I would do that and see if it solves the problem. Sensors cost about $25 each at most part stores.

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post #4 of 12 (permalink) Old Dec 27th, 12, 12:24 PM
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Re: Jeep tire pressure sensor question-help?

on my 2006 Grand Cherokee I have one sensor that one pound low and it goes off, the other 3 are about 3 pounds before notice. I have never replaced any of the sensors so she came from the factory that way.


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post #5 of 12 (permalink) Old Dec 27th, 12, 12:37 PM
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Re: Jeep tire pressure sensor question-help?

As said, OM gives reset procedure. Make sure all tires have the same pressure, within a 1/2 lb.
Sensors work, turn on, when driving, generally around 20-25 mph, and report a loss of 10%-20%.
Sensor battery designed to last 10 years, or so, dependent upon miles driven.
TPM antenna is usually located about drvr side front wheel area.
The nice systems will tell you pressure of each tire with the OBC, On Board Computer, use the car icon/button.

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post #6 of 12 (permalink) Old Dec 28th, 12, 10:50 AM Thread Starter
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Re: Jeep tire pressure sensor question-help?

Thanks guys for the immed and useful info, eh? Was able to walk into the dealer with said info and carry on a decent conversation, asking the "right" questions.


Seems that up here in the land of ice and snow, the valve/sensor unit costs $120 retail, and another $60 to take the tire, install the unit, which ended up a hair short of $200. Let's see, that's $600 the remaining valves to be replaced down the road...hmmmm?

Personally, I'd turf the valves/sensors, and go with the reg valves, checking the tires every two weeks or so. These opts are more of a convenience than a necessity (IMO)...but, they at the branch "warned" us that she'd have to sign a waiver, acknowedging the fact that the sensors were not there any longer. A scare tactic on their part? I can't see a meaningful use of such devices in say in a blowout, or the need to replace tires because of low presssure. In the first case the sensor may not act in time, and and in the second, negligence is more the cause.

Anyways, thought to share this experience if you find yourself in a similar situation either of having a vehicle with this sensory set up...or a young one who has one.

Again, thanks for the quick shares...but that's what this site is all about! Helping each other.

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post #7 of 12 (permalink) Old Dec 28th, 12, 12:01 PM
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Re: Jeep tire pressure sensor question-help?

It's a simple thing to change if you have a "friend" with a tire machine, but as yor thinking wev'e survived quite a while without them.

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post #8 of 12 (permalink) Old Dec 28th, 12, 12:22 PM
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Re: Jeep tire pressure sensor question-help?

Quote:
Originally Posted by captcanuck68 View Post
Seems that up here in the land of ice and snow, the valve/sensor unit costs $120 retail, and another $60 to take the tire, install the unit, which ended up a hair short of $200. Let's see, that's $600 the remaining valves to be replaced down the road...hmmmm?
I'd check a local tire center like Discount and see just how bad the dealership there is gouging you!

...Dennis

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post #9 of 12 (permalink) Old Dec 28th, 12, 01:13 PM
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Re: Jeep tire pressure sensor question-help?

TPM's were added as a safety feature alerting the driver a tire has lost air before tragedy strikes. Also, for those who don't do regular maintenance as we do. Started out as an option, now Feds' are going to make it mandatory and they will become std feature.

Case in point, Mother-In-Law drives her car 30 miles one way min twice a week in Iowa.
She complained a red light was on, had been on all week. Wife asked her the shape of the red light and MIL described it, Wife said low tire pressure warning, look at the tires. MIL found one not looking like the other tire on the same side.
Wife said the TPM is doing its job.
MIL was thankful.

Yes, I have them on my M3 'Vert and Wife's company car, '09 Impala.
I think its a pain in the butt, something else to break.
Funny thing tho', BMW says a low tire, you pick it out.
Impala reads each tire and displays pressure. Go figure.

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post #10 of 12 (permalink) Old Dec 28th, 12, 03:57 PM
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Re: Jeep tire pressure sensor question-help?

They are a nice add on. I have them on my Silverado 2500 HD and it's reassuring to do a tire inflation check when towing 12,000 lbs. on a four lane at 65 mph.

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post #11 of 12 (permalink) Old Dec 28th, 12, 04:12 PM
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Re: Jeep tire pressure sensor question-help?

Oh yes, I do agree, they are nice to have.
I started going to work at 5 AM and get down the block, TPM comes on.
I stop and look, rear tire is not round.
I return home and take another vehicle.

Saved me from getting very far. Tire had a drywall screw in it.

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post #12 of 12 (permalink) Old Dec 28th, 12, 04:39 PM
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Re: Jeep tire pressure sensor question-help?

For those that are wanting to disable the low pressure sensors and corresponding dash light, the procedures are explained if you do an internet search. I read the story over on Moparts about doing that when changing to different rims.

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