How accurate are the HHR's tiree pressure sensors? My manual guage is telling me 30 psi but the DIC display is reading 27 to 29 psi. Which do I trust???

 

I haven't got an answer for you but I bought a digital reader and found 3-4 pound difference...

JIm

 

The service dept. told me to expect a (+/-) 3 pound differential..

Firestone recommends 30 psi, the dealer recommends 33 psi, and
Discount Tire recommends 35 psi....

Mine are inflated to 35 psi.....

Cajun

 

My TPS is 1-2 psi lower than the dial gauge I use. I trust the dial.

 

17'' that came from the factory are 35 psi cold. Sticker on the door pillar has the correct pressure for the factory installed tires for anyone else who wants to know what "theirs" should be.

 

The 16" affinity recommend 30psi. Dealer told me 32. I went 33 just because Obama said so. lol.

 

Good for him. I didn't know you knew him. Wow, you sure are lucky

Seriously with my calabrated gauge the pressures on the HHR and my wifes STS are the same as long as the gauge reads on the high side of the mark but below the next one. So less than a lb. difference.
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I"ve been having touble keeping one rim at 30 on my SS. Took it to the Dealer to find the leak and they couldn't. But I did notice that they jacked the pressure up to 36. Don' t know if this will help the leak situation.

JIm

 

Also with some of us here how accurate is the gauges we are using?

Cheap ones are not always too accurate even in Digital.

I have a good Circle Track gauge that is on the money and it shows my TPM's to be 0-2 PSI off.

 

I worked with Ammco/Coats when tire pressure monitoring first came on the market. I wrote several manuals dealing with tire changing, balancing, etc. on cars with TPMS installed. At the time, no manufacturer was including it on the vehicle, they were only aftermarket. Anyway, one of the things we covered in our manuals was that the system was best for monitoring the change in tire pressure and not necessarily the "actual" pressure in the tires. That was the point of the original systems: to help you monitor the pressure in your tires so that you were aware of any loss in pressure.

I've been flamed on this before, but trust me, I worked in this field at the beginning.

The current systems are far superior to those first ones, but the fact still remains that you should only rely on them to notify you of a tire going soft and not to give you "accurate" psi readings in your tires. Always use a good, reliable gauge to check the pressures yourself and maintain proper pressures.

Just my 2 cents. Flame resistant suit now engaged.