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Discussion Starter #1 (Edited)
The information below is not a substitute for the information in your owner's manual. That should be your primary reference source. If any information below conflicts with the owner's manual, use the owner's manual as the final word.

You'll want sensors that operate at 315 Mhz for 2011-2016. 2017 Volt and Bolt use 433 MHz.

TPMS Basics
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TPMS History
Following several fatal accidents involving under-inflated tire failure and vehicle rollover, in 2000 Congress passed the Transportation Recall, Enhancement, Accountability and Documentation Act (TREAD). The law mandates the use of a suitable TPMS technology to alert drivers of a severe under-inflation condition of their tires. All new vehicles produced for the US market after September 2007 are required to have a TPMS.

What is a TPMS?
The Volt comes equipped with a TPMS (Tire Pressure Management System) that remotely reads the pressure inside each tire. The TPMS sensors monitor the air pressure in the tires and transmit the tire pressure readings to a receiver located in the vehicle.

What is the purpose of the TPMS?
The purpose of the TPMS is safety first, with significant side benefits of extended mileage, increased fuel economy and longer tire life.

  • Safety: A low tire pressure telltale in the DIC (Drivers Information Center) is illuminated when one or more of your tires is significantly under‐inflated by about 25% (10 psi or 69 kPa/bar). This can warn you before major damage or an accident occurs. Driving on a significantly under‐inflated tire causes the tire to overheat, it may affect the vehicle's handling and stopping ability and it can lead to tire failure.
  • Mileage: Under inflated tires can lower mileage by 0.3% for every 1 psi (6 kPa/bar) drop in all four tires.
  • Fuel Economy: Drivers can improve gas mileage by approximately 3.3% by keeping tires inflated to the proper pressure.
  • Tire Life: Under‐inflation also reduces fuel efficiency and tire tread life. Because a typical tire may lose 1 to 2 psi (6-14 kPa/bar) a month if not checked and adjusted, uninformed drivers may suffer tire replacement sooner than necessary. Some tire manufacturers advise that just 5 psi (34 kPa/bar) below recommended pressure could lessen a tire's tread life by as much as 25%. So under inflation could cause the Volt's tires to wear out at 45k miles vs. their rated 60k miles.
Where does the tire pressure display?
The TPMS displays each tires pressure on the DIC (Drivers Information Center).

How accurate are the pressure readings?
The TPMS generally reads about 1-2 psi (6-14 kPa/bar) lower than a reasonably accurate handheld gauge. Note that cheap handheld gauges may be off by that much or more. So depending on the handheld gauge you are using, it may disagree by up to 3 psi (21 kPa/bar)with the TPMS numbers.

How long do TPMS sensors last and how much do they cost?
They last as long as their battery does and cost $40-$80 each to replace depending on where you buy them (ebay, online parts, dealer). General life expectancy is about five years and 75,000 miles. However, frequent on-off TPMS cycling, tire pressure sampling frequency and temperature extremes will significantly shorten battery life. Sensors are usually powered by 3-volt lithium ion batteries, but some use 1.25-volt nickel metal hydride batteries. And no, the battery alone can't be replaced.

TPMS Sensor and Stem.jpg

When filling the tires should I use my hand gauge or the TPMS?
Use your hand gauge to fill the tires and check their pressure. Use the TPMS to verify. Avoid the cheap "stick" gauges and get a nice dial gauge.

Error Messages
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What should I do if the TPMS light/warning display?
Stop as soon as possible. Check for a flat. Repair if possible. See our flat tire repair guide:
http://gm-volt.com/forum/showthread.php?18943-Chevy-Volt-Flat-Tire-Tire-Inflator-Guide.
Also see your owner's manual.

TPMS Light.jpg
For low pressure tires without a flat, inflate the tire(s) to the pressure value shown on the Tire and Loading Information Label (about 38 psi).

A "TIRE LOW ADD AIR TO TIRE" message is displaying. What should I do?
This message displays when the pressure in one or more of the tires is low. This message also displays LEFT FRONT, RIGHT FRONT, LEFT REAR, or RIGHT REAR to indicate the location of the low tire. Do what it says, pull over as soon as possible and add air to the tire. If the pressure drops again, you may have a slow leak from a nail or other tire damage.

My light comes on when I start the car and then goes off. Is there a problem?
The TPMS light comes on briefly when the vehicle is in ON/RUN. This is normal.

My TPMS light flashes for about one minute and stays on steady until the vehicle is off. This happens every time I turn on the car. What's going on?
There may be a problem with the Tire Pressure Monitor System.

The TPMS malfunction indicator is also used to indicate when the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start‐ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly.

Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.

My TPMS displays two dashes (--) for one or more tires. Sometime the tire pressure displays, other times two dashes. What's going on?
The two dashes indicate the TPMS sensor has lost communication. Does your key FOB now have a reduced range (less that 20 feet) as well? Problems using the FOB to open the back hatch? In the black box by the rear view mirror there is a Remote Control Door Lock Receiver (a "RCDLR module") that receives the TPMS and FOB radio signals. It is failing and the source of the problem. See your dealer. Tell them about GM bulletin #PIC5604C labeled "poor remote transmitter range/remote start Or TPM Indicator on - Dec 14, 2012" The bulletin says "Replace the RCDLR module". The new RCDLR receiver has been revised. So far this issue seems limited to MY 2012.

TPMS and FOB Receiver.jpg

Please note: Noisy/cheap 12VDC to 5VDC adapters for dash cams, etc. can cause intermittent TPMS failures. http://gm-volt.com/forum/showthread.php?65490-TPMS-not-getting-a-reading-Replacing-Body-Control-Module

"Service Tire Pressure Monitor System" message is displaying. Ideas?
Did you recently have your summer/winter tires mounted or removed? The person doing it may have forgotten to relearn the TPMS for the new set of wheels.

Other Questions
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My TPMS showed one tire losing pressure over a few days, then it stopped loosing pressure. All 4 tires started at the same pressure. Is my TPMS bad?
More likely your tire has a slow leak caused by a nail or screw puncture in that allows air to escape depending on how the tire flexes. Or it could be a leaking valve stem, or a bad tire bead. Have the tire visually inspected after being sprayed with soapy water, or placed in a water dunk tank. http://gm-volt.com/forum/showthread.php?120601-Tire-Leaking...-Then-Stopped and http://gm-volt.com/forum/showthread.php?71937-Tire-pressure-issues

Can I rely exclusively on the TPMS?
No. The TPMS is not a substitute for proper tire maintenance, and it is your responsibility to maintain correct tire pressure, even if under‐inflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale.

What pressure should I keep my tires at?
Refer to the Tire and Loading Information label attached to the center pillar (B-pillar). With the driver door open, the label is below the door lock post. Many gm-volt members set their tires at 40 psi (276 kPa/bar) for slightly better battery range and gas mileage as well as improved handling. The downside is a lightly harder ride.

Where is the TPMS Located?
An air pressure sensor and transmitter are part of each wheel's valve stem assembly at the base of the tire stem. Replacements cost ~$60 each. The receiver is located on the windshield in the black box by the rear view mirror.

What affect does rotating my tires have on the TPMS?
The car needs to reset ("relearn") where each tire's new position is. This is done using a "relearn" tool.

What if I don't reset/relearn my TPMS after a tire rotation?
The car will still display the tire pressure, but the tire locations will be inaccurate because the car does not know the tire has been moved to a new location on the car. This can be confusing and people may fill the wrong tire. Best practice is to reset the TPMS by following the instructions in your owner's manual. See http://gm-volt.com/forum/showthread.php?39929-Do-it-yourself-tire-rotate

Can the TPMS be disabled when driving on winter wheels without TPMS sensors?
No. If the TPMS does not "see" the wheels a "Service Tire Pressure Monitor System" message will display (but no chime). You can erase the message by pressing once on the button to the left of the wheel giving you back your normal screen. You must do this every time you start the car.

Can I move my TPMS sensors to my new wheels?
Kind of. The GM version for the Volt does allow for replacement of the powered transmitter portion which is screwed to the valve stem or the stem alone can be replaced.

So you'll likely need new valve stems (~$15 each), plus an $8 service kit. Anytime you replace tires you are supposed to replace the seals (the $8 service kit) around the TPMS sensor.

Valve stem with TPMS transmitter: http://www.ebay.com/itm/GM-TPMS-Tire-Pressure-Monitoring-System-Sensors-by-GM-/151096349070?pt=Motors_Car_Truck_Parts_Accessories&hash=item232e0b518e&vxp=mtr
Valve stem alone: http://www.ebay.com/itm/4-TR20008-Rubber-TPMS-Valve-Stems-New-/261258913280?pt=Motors_Car_Truck_Parts_Accessories&hash=item3cd43ea600&vxp=mtr

I topped off my tires but MyVolt.com still shows the old readings. What's wrong?
MyVolt.com only updates its tire pressure reading once a month. MyLink apparently shows psi in almost real time. There may be other smartphone apps that report changes in real time. If so, let me know.

The TPMS is reporting that the tires on one side of my parked car are higher than the other side. Later all 4 are the same. Sensor problem?
Probably not. Where is the sun shining? The tires reporting higher pressure may simply be in the sun. Tires can easily gain pressure as the sun heats the rubber.

Related Posts and Links
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Info & Guides
http://www.tpmsmadesimple.com/how_tpms_saves_money.php
http://community.cengage.com/Chilton/blogs/davids_blog/archive/2009/11/17/what-you-need-to-know-about-tire-pressure-monitoring-systems.aspx
http://gm-volt.com/forum/showthread.php?39929-Do-it-yourself-tire-rotate
http://gm-volt.com/forum/showthread.php?18943-Chevy-Volt-Flat-Tire-Tire-Inflator-Guide
http://gm-volt.com/forum/showthread.php?76762-Tire-Pressure-Gauge
http://gm-volt.com/forum/showthread.php?71929-Can-t-swap-tire-pressure-sensors
http://gm-volt.com/forum/showthread.php?70313-2013-TPMS-Sensor-Part
Error Messages
http://gm-volt.com/forum/showthread.php?15043-Tire-Pressure-Monitoring-System-showing-no-pressure-in-one-tire
http://gm-volt.com/forum/showthread.php?14242-quot-Service-Tire-Pressure-Monitor-System-quot
http://gm-volt.com/forum/showthread.php?74370-odd-tpms-issue
http://gm-volt.com/forum/showthread.php?65490-TPMS-not-getting-a-reading-Replacing-Body-Control-Module
http://gm-volt.com/forum/showthread.php?76330-Can-the-TPMS-be-disabled-during-winter-driving
http://gm-volt.com/forum/showthread.php?71937-Tire-pressure-issues
Tire Pressure Discussions
http://gm-volt.com/forum/showthread.php?120601-Tire-Leaking...-Then-Stopped
http://gm-volt.com/forum/showthread.php?32153-What-s-your-tire-pressure
http://gm-volt.com/forum/showthread.php?8025-Tire-Pressure-Monitor-Accuracy
http://gm-volt.com/forum/showthread.php?6143-Tire-pressure
http://gm-volt.com/forum/showthread.php?14137-Tire-Pressure
http://gm-volt.com/forum/showthread.php?10350-Tire-Pressure
http://gm-volt.com/forum/showthread.php?74562-Volt-tire-pressure-sensor-accuracy
http://gm-volt.com/forum/showthread.php?16713-TPMS-versus-tire-gauge
 

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I had my first experience with the TPMS in a rented 2009 Chevy Impala. The left rear tire sensor was showing only 26 PSI while the other three sensors had 31 PSI. I bought a tire gage and a 12 VDC air pump to fill that tire. When I checked with the gage, it has 32 PSI. I reported this problem to the car rental when I returned the Impala.

So if your vehicle has a TPMS, get a top grade gage and compare readings. If a TPMS sensor reading is very different from the others, use the gage and check. If the readings are close to the TPMS indication, they are good. But if the reading differ by more than 4 PSI, have the sensor replaced, or just forget about it and do manual readings (old school) every week.

Edit: Seems like destiny hits twice. Today the TPMS icon was illuminated (orange) in my 2009 Chevy Equinox, and the DIC warned me to check the left rear tire pressure. The TPMS reading from the sensor was 26 PSI. I checked with my mechanical gage (by chance it is the same I used in the rental Impala that I described above) and the pressure reading is 34 PSI. So I have to make an appointment with my local GM dealer to check that TPMS sensor, and at the same time change the oil (it has 18% left according to the DIC).
 

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Excellent post, Steverino.
I have tried to put 40 pounds into my Volt twice. Both times the psi slowly dropped to 37-38 over a week or two, and then stayed there with some temperature oscillation. I think i will try 39 next time. With the weather turning colder i want every mile of AER i can get.
 

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2017 Chevy Express Explorer Van. Tire inflation system always indicates right rear low pressure. Showed first week purchased van. Dealer has replaced sensor. The dealer has reset. I have reset with instructions in Manuel. Tires have been rotated. Even after rotation knowing the tire with new sensor in right front. After driving still indicates right rear low pressure. Have checked tire pressure not low. If a wiring or computer problem how dinIvget help. Dealer does not help.
 

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2017 Chevy Express Explorer Van. Tire inflation system always indicates right rear low pressure. Showed first week purchased van. Dealer has replaced sensor. The dealer has reset. I have reset with instructions in Manuel. Tires have been rotated. Even after rotation knowing the tire with new sensor in right front. After driving still indicates right rear low pressure. Have checked tire pressure not low. If a wiring or computer problem how dinIvget help. Dealer does not help.
What does the Owner's Manual say about the TPMS? The Volt Manual states that you may need to drive the vehicle up to 2 miles to obtain an accurate reading from the TPMS. In my experience, if the TPMS is giving a false (low reading) from one or more tires this will automatically be corrected by driving the Volt for ~1.5 miles.
 

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a tire tool will trigger a reading the car and the tool should be close in the PSI reading.

watch out you do not have the extra 5th tire in the rotation. ( I did that once )

a axel pressure unballance in readings will trigger the light
 

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2017 Chevy Express Explorer Van. Tire inflation system always indicates right rear low pressure. Showed first week purchased van. Dealer has replaced sensor. The dealer has reset. I have reset with instructions in Manuel. Tires have been rotated. Even after rotation knowing the tire with new sensor in right front. After driving still indicates right rear low pressure. Have checked tire pressure not low. If a wiring or computer problem how dinIvget help. Dealer does not help.
You said a reset was done twice. Not sure what you mean by that. How about the relearn procedure that allows the system to learn which sensor is in which corner of the car. Was that done? If not, it could help explain your problem. It requires a specialized tool. Also you said the sensor was replaced. Can you be sure they actually replaced it or that they replaced the correct one (just because the TPMS says the "bad" sensor is at right rear does not mean it is actually at that corner)? If not, that could also help explain your ongoing problem. What happens if you let air out of the tire that is reading low? Will the TPMS display show the change and in the correct position? Also I agree with the mention of the spare tire. Does it have a sensor in it and what is the pressure of that tire measured with a pencil gauge?
 

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Use a good tire gauge and compare the TPMS to your guage. Then make the adjustments in your head. My Volt is +/- 1 PSI but my Cruze read low by as much as 5 PSI. It turns out the actual tire can make a difference as well so when you replace your tires you need to do this again.
 
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