TPMS sensor 9 psi low- calibration adjustment?

[HDJdreams]

One of my TPMS sensors reads 7-9 psi below actual inflation pressure, so it trips the warning lights.

Does a low battery cause low pressure readings? It’s one of the first/fastest sensors to register the pressure on the display after start up.

I had some that were replaced within last 2 years by a tire shop. I *think* it was one that was replaced, but not sure. Since I got all 5 working, this one has always read low, used to be about 7 psi before, but was 9 psi off this morning.

Is there any way to calibrate the TPMS with computer? I.e. tell the computer that it’s reading 35 psi not 26?

Or is the only solution replacing it?

 

[Tommy Dwyer]

One of my TPMS sensors reads 7-9 psi below actual inflation pressure, so it trips the warning lights.

Does a low battery cause low pressure readings? It’s one of the first/fastest sensors to register the pressure on the display after start up.

I had some that were replaced within last 2 years by a tire shop. I *think* it was one that was replaced, but not sure. Since I got all 5 working, this one has always read low, used to be about 7 psi before, but was 9 psi off this morning.

Is there any way to calibrate the TPMS with computer? I.e. tell the computer that it’s reading 35 psi not 26?

Or is the only solution replacing it?

Have you tried the TPMS reset? First, inflate all of your tires to the desired / correct pressure. Then if reach down below the steering column toward the bottom of the dash, there’s a button to reset the TPMS. At least that’s where it’s located on the LC. Might double check your manual and give that a try.

 

[HDJdreams]

Yes, tried that.

 

[FJ73Texas]

There is no way to recalibrate the OEM sensor itself. I would replace it.

 

[Tommy Dwyer]

My guess then would be a faulty sensor. That would suck if it’s one you’ve already replaced once.

 

[FJ73Texas]

For various reasons, they do go bad.

Try reading it outside of the tire and wheel assembly (or with the assembly completely deflated) to see what it reads at. Chances are it won’t be zero PSI/KPa or close to it.

 

[bloc]

What kind of sensor did the tire shop replace yours with? OEM are very high quality, the clone sensors tire shops often use are not, to say the least.

If they used a clone, you can get OE-supplier Pacific Industries units on amazon for about $40, but you’ll need to program your TPMS computer to look for the new sensor ID. There are a few ways to do this.. tire shops are hit or miss on being competent enough to do it.

 

[FJ73Texas]

I wasn't sure if OEM was Pacific Air Controls as I am not involved with the 200 series or own one. They are used on Tacomas and some Tundra models so I am somewhat familiar with them.

The older Pacific TPMS sensors seemed to go bad even if they were brand new before they changed the design but it was rare. You can easily ID the older ones if they have a black plastic cover over the back that covers the chip. Too much pressure on that black plastic cover during install or removal from the wheel could screw up the internals leading a false reading.

The newer ones don't have that black plastic cover and you can just see the internals encased in a clear type of resin or silicone. Never seen any of the newer ones go bad in this fashion.