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Discussion Starter · #1 ·
The other day I had to have my TPMS replaced in one of my tires. My 2010 wt 2.9L never had a key fob. When the mechanic attempted the relearn, he stated in went into limp mode. And they kept asking for the key fob. Has anyone ever heard of this when trying to relearn the TPMS? It doesn't make sense to me. Can anyone explain if this is possible and why it would be?
 

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I suggest following the TPMS sensor matching process in the owners manual found on page 5-73 . Good luck with it . It has been my experience that when replacing only one sensor it does not match up well with the other 3 as the battery power in the new sensor is stronger than in the others . I hope you have a better result .
 

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I also have had individual sensors replaced with no issues. Though if you are replacing original sensors, you know its only a matter of time before the rest follow the weak link and give up. Best to replace them all if you have the funds, just to save frustration later. However, I did not follow my own advice there this fall, and will likely be back at the shop in the next year or so. :)
Using the relearn process with the parking brake and headlamp switch worked fine for me.
 

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Discussion Starter · #5 ·
Lol same situation. The first was replaced last year. Just short on funds. As far as I know, they are the originals. What is the process? I have not had the opportunity to really look it up yet.
 

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TPMS Sensor Matching Process

Each TPMS sensor has a unique identification code. Any time you replace one or more of the TPMS sensors or rotate your vehicle’s tires, the identification codes need to be matched to the new tire/wheel position.

The sensors are matched to the tire/wheel positions in the following order: driver side front tire, passenger side front tire, passenger side rear tire, and driver side rear tire using a TPMS diagnostic tool. See your dealer/retailer for service.

The TPMS sensors can also be matched to each tire/wheel position by increasing or decreasing the tire’s air pressure. If increasing the tire’s air pressure, do not exceed the maximum inflation pressure indicated on the tire’s sidewall. To let air-pressure out of a tire you can use the pointed end of the valve cap, a pencil-style air pressure gage, or a key.

You have one minute to match the first tire/wheel position, and five minutes overall, to match all four tire/wheel positions. If it takes longer than one minute, to match the first tire and wheel, or more than five minutes to match all four tire and wheel positions, the matching process stops and you need to start over.

The TPMS sensor matching procedure is outlined below:


  1. Set the parking brake.

  2. Turn the ignition switch to ON/RUN with the engine off.

  3. Turn the exterior lamp switch from AUTO to OFF four times within three seconds. A double horn chirp will sound and the TPMS low tire warning light starts flashing. The double horn chirp and flashing TPMS warning light indicates the TPMS matching process has started. The TPMS warning light should continue flashing throughout the matching procedure. The LOW TIRE message displays on the Driver Information Center (DIC).

  4. Start with the driver side front tire.

  5. Remove the valve cap from the valve cap stem. Activate the TPMS sensor by increasing or decreasing the tire’s air pressure for 10 seconds, then stop and listen for a single horn chirp. The single horn chirp should sound within 15 seconds, confirming that the sensor identification code has been matched to this tire and wheel position. If you do not hear the confirming single horn chirp, turn the ignition switch to LOCK and start over beginning with Step 2.

  6. Proceed to the passenger side front tire, and repeat the procedure in Step 5.

  7. Proceed to the passenger side rear tire, and repeat the procedure in Step 5.

  8. Proceed to the driver side rear tire, and repeat the procedure in Step 5.

  9. After hearing the confirming horn chirp for the driver side rear tire, check to see if the TPMS low tire warning light and the DIC LOW TIRE messages have turned off. If yes, the TPMS sensors have been relearned. Turn the ignition switch to LOCK/OFF.

    If the low tire warning light and the SERV TPM message on the DIC are on after completing Step 5 for the driver side rear tire, the sensor relearn process has not been successful. Turn the ignition switch to LOCK/OFF and repeat the matching process beginning with Step 2.

  10. Set all four tires to the recommended air pressure level as indicated on the Tire and Loading Information label.

  11. Put the valve caps back on the valve stems.
 

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Note: The parking brake is not just a safety thing. The BCM is looking for that parking brake signal from the lever. You need to see the indicator on the dash that the parking brake is set. I had to clean my parking brake switch to get it to read correctly, there were some foul words involved trying to figure that part out.
 

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Discussion Starter · #8 ·
Lol awesome!! Thank you. I will be attempting that. Luckily I don't seem to have a problem with the parking brake at the moment, so it should work out well.
 

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Discussion Starter · #11 ·
Here's the update. CEL is off and was able to pass inspection. Brought it home and tried the TPMS relearn. Parking brake on, the whole 9 yards. First time around I was getting a beep at every tire. Shut it off, Serv TPM message is still there. I tried it 2 or 3 more times, but I was not able to get a beep at all tires. Am I correct to suspect another sensor is bad?
 

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It could be due to spring air temperatures going up and down and the sensor being overactive . I for one am not a fan of this system , to little detailed information and too many gremlins .
 

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I had the same issue with a weak battery. Sometimes would connect, sometimes nothing. I would suspect the wheel you have trouble getting to beep.
On most vehicles it shows you which one won't connect, but our rudimentary system does not. And that is frustrating. It depends on the age of the DIC architecture. The 355 got very few upgrades along the way on the electronics.
 

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Discussion Starter · #14 ·
I apologize for the late response, life got crazy. I am thinking it is the battery as well. I have had 2 replaced. The day after I did the relearn, the light went off. Now about 2 weeks later, it is starting to come back on. I guess I will have to replace that one as well.
 

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I was running into this issue, kept going to a shop and they told me one of my TPMs had a bad battery. Made the mistake of replacing one at a time and we lost track of which ones were done and which ones weren’t over the months (dumb - I was ready to give up). The shop was thinking it was a bad module. Finally a mechanic was able to read which one wasn’t working (wish this was the person working on it to begin with!) and we solved this issue by replacing the right one.

Now I can do my seasonal tire swap at home with this process and relearn my TPMs on each wheels. I have to do a test drive after and hit highway speeds, then when I restart the warning goes away. Was frustrating as hell and a waste of money on TPMs though.
 
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