Hi Team - TPMS is acting strange. TPMS warning light comes on at freeway speeds; turns off after returning to cirt streets.
Tire pressure values are dash lines; no numerical psi numbers.
I did a reset...
The tires may be 2 psi over. I will set tire pressures tomorrow morning when they are cold. I have a good gauge.

Can you shed light on this?
I appreciate your help.

 

Strange indeed - so a few questions:
- The pressure values *never* register a number? Not at startup? After driving a few miles? After the warning light turns off when you go back to city driving?
- Values showing dashes on all 4 wheels?
- Any tires/rim service recently?
- When did this start?
- Model year of your GS?

My first thought was the battery in the TPMS sensor was dying, but that wouldn't likely happen on all 4 wheels (presumably) at the same time....

 

2013 GS350 F Sport, 75K miles. Michelin Pilot Sport 4+
No service in 15K.
Tire pressure never registers, 4 dashed lines.
The TPMS warning started almost 2 weeks ago.

I will check at startup tomorrow morning. I will also check and set psi if necessary.
Thanks for your help.

 

My wife's car developed the same problem the other day. TPMS light is on, and none of the tire pressures are displayed. Just the dashed lines.... I would think that if one of the batteries died in one of the TPMS sensors, then only that tire would not display. It would also make it easy to diagnose/replace. Why all four don't work is a mystery.

 

Here is another thread with the same issue:
TPMS Dash Lines

 

Based on the info, I'd be inclined to believe it's a problem with the TPMS receiver. I'd take the same advice that's in the thread you referenced - take it to a dealer and have them diagnose. While it won't be a warrantied fix, at least you'll know what the issue is and how to go about getting it taken care of. This doesn't sound like a DIY fix, IMO. Good luck, and let us know what the problem is/was.

 

I had to do a reset I found in the owners manual for my 2015 GS F-sport.

 

Was just going to post the same problem. After a little on highway speeds all values turn to dashes and warning light flashes than stays on. Problem started a month ago. Does anyone know where the receiver is? Is it easy to change? I have reset but issue persists. 2014 GS with 90K miles. Did start after the recent fuel pump recall, oil change and tire rotation. Always a conspiracist in thinking just a way for the dealer to get me back to spend more.

 

Anyone know the process of changing out the receiver? Looks like it also is use for key controls.

 

I have a 2013 as well and had to replace all my sensors at 80k. I think your issues stem from a dying battery. You will need new senors.

 

All batteries going at the same time? Never had I have just 1 or 2 display dashes only all

 

The TPMS system is a bit dumb if one is out of whack it seems to now show anything. In my case I had a tire shop check out the sensors and they said the battery was likely dead. I changed all 4 and it's displaying again with no issues.

 

I suspect quite a few owners have replaced their TPMS units when they see dashes being displayed instead of the air pressure when they really didn't have to replace them. This is very common during colder weather months.

As the TPMS batteries age they have a tendency to only display dashes instead of the air pressure during colder temperatures. When this happens the air pressure usually displays again after driving a few miles, but sometimes it takes a number of miles before the air pressure displays. The colder it is the more likely it will take a long time to display the air pressure. This idiosyncrasy never happened when the car was much newer.

During this past February we had a [once in over a hundred years] week of near 0° temperatures in the Dallas area, and during that time I never saw the air pressure display even though the garage never got lower than 50° and one day during that period I drove the car about 40 miles and still no air pressure displayed. However, I felt quite sure it would work properly again as soon as the weather warmed back up, which it did. During warm temperatures they always display the air pressure right away on startup or after driving just a few feet, just like when the car was new.

As an aside, I have noticed over the years that when the wheels/tires are rotated during colder temperatures it appears to trigger this strange behavior of displaying dashes for a period of time before the air pressure finally displays. Maybe the self-recalibration process (after wheel rotation) causes a period of time in which it drains the TPMS batteries (for which the batteries need to recover from being drained), whereas under normal operating conditions the TPMS sensors only send a signal once every so often.

 

I had the same issue with my car this winter. I used the Carista app and it reported a fault in one of the sensors. I cleared the error with the Carista tool and everything worked again as expected. Probably a low battery and if the car sat for a while the sensors went to sleep mode.

 

I balanced the rear tires today and have all 4 dashes on display....