35 PSI for 2011 models, and 38 PSI for 2012. It's not in the owner's manual for good reason - the sticker is the gold source of information - on some vehicles (more with trucks than the Volt or cars), it depends on the wheel size and other options ordered.For those of us without a Volt to open the driver's door, what is the recommendeded tire pressure range? It's not listed in the online owner's manual
Interesting and of course obvious once you think about it -- which I hadn't! LOL35 PSI for 2011 models, and 38 PSI for 2012. It's not in the owner's manual for good reason - the sticker is the gold source of information - on some vehicles (more with trucks than the Volt or cars), it depends on the wheel size and other options ordered.
I would guess that the vehicle tire pressure sensors are more accurate than most consumer gauges. The manufacturers have more incentive to provide accurate information than the consumer gauge sellers. The only way to tell for sure is to have your "manual" gauges calibrated by an instrumentation calibration service.I've attempting to put mine at 45, but I dont think they are. On two separate manual guages, they register at 45 PSI. But on ALL four of the tire pressure sensors, they register at 40. I dont know what to believe.
The Explorer issue was exactly the opposite problem -- people listening to Ford, rather than using common sense. Ford put lower pressure ratings on them to help with road noise and comfort.You're doing this by poll??? A lot of wrong answers doesn't make something right. Trust the tire engineers and the label displayed prominently when you open the driver's door.
By the way, this goes back all the way to the Corvair and Ralph Nader. People were putting air in the Corvair according to what they thought felt or looked right, with disastrous results. Ditto with the Ford Explorer and Firestone tires. The tire pressure labels have been around since at least the early 70's for good reason.
Not sure of the exact number but we know this:I have only had my Volt for 10 days. Yesterday the Low Tire Pressure Warning came on (to my surprise). After some fumbling I got the DIC readout to tell me the pressures -- they were [email protected], [email protected] [email protected] This all seemed normal until I noticed the placard on the driver's door that said the cold pressure was supposed to be 38 psi. This seems high but my Volt adviser confirmed it was correct. So I guess the normal cold tire pressure in the Volt needs to be considerably higher than a typical car? Does anyone out there know the psi value for any tire to get the low pressure warning? Also is there a pressure differential that will set it off?
Meanwhile all this happened b4 I knew of this forum. Having now read many other posts on tire pressure I understand better that a higher psi is needed. But I'd still like to find out, if anyone knows, what is the low pressure trip point that causes the driver to be alerted.
Tire Pressure Monitoring System Operation
The tyre pressure monitor system warns the driver when a significant loss or gain of tyre pressure occurs in any of the 4 tyres. It allows the driver to display the individual tyre pressures and their locations on the driver information centre.
The system uses the body control module (BCM), driver information centre, instrument cluster, remote control door lock receiver, tyre pressure indicator module and a radio frequency transmitting pressure sensor in each tyre assembly. Each sensor has an internal power supply.
When the vehicle is stationary, the sensors internal accelerometer is inactive which puts the sensors into a Stationary state. In this state the sensors sample tire pressure once every 30 seconds and do not transmit at all if the tire pressure does not change. As vehicle speed increases, centrifugal force closes the sensors internal roll switch, which puts the sensor into Wake and then Drive mode. The remote control door lock receiver receives and then sends the tyre pressure and temperature data to the body control module (BCM). The tyre pressure indicator module sends sensor ID and location data to the BCM. The BCM translates the data contained in the tire pressure sensor radio frequency transmissions into sensor presence, sensor mode, and tire pressure. Once vehicle speed is greater than 40 km/h (25 MPH), the remote control door lock receiver waits for the sensors to go into Drive mode.
Each sensor has its own unique identification (ID) code which it transmits as part of each RF message and must be learned into the BCM memory. Once all 4 ID's have been learned and vehicle speed is greater than 40 km/h (25 mph), the BCM continuously compares ID's and pressure data in the received transmissions to the learned ID's and pressures to determine if all 4 sensors are present and if one or more tyres are low. If the BCM detects a low tyre pressure condition, a variation in pressure between 2 tyres on the same axle, or a malfunction in the system, it will send a serial data message to the instrument cluster requesting the appropriate tyre pressure monitor indicator illumination and also to display the appropriate data message on the driver information centre, if equipped.
The sensors continuously compare their last pressure sample to their current pressure sample and will transmit in Learn Mode-Pressure Triggered if a 8.3 kPa (1.2 PSI) change in tyre pressure has been detected in either a Stationary or Drive state. When the tyre pressure system detects a significant loss, or gain of tyre pressure, the tyre pressure monitor indicator icon is continuously illuminated on the instrument cluster and if equipped, a check tyre pressure type message is displayed on the driver information centre.
Both the indicator icon and driver information centre message can be cleared by adjusting the tyre pressures to the recommended kPa/PSI and driving the vehicle above 40 km/h (25 MPH) for at least 9 minutes.
If power is disconnected from the BCM or if the vehicle battery is disconnected each tire pressure sensor ID is retained but all of the tire pressure information is lost. Under these circumstances the BCM cannot assume that the tire pressures were maintained over an unknown period of time. Cars equipped with the driver information centre will display dashes and the scan tool will indicate a default tyre pressure value of 1020 kPa (148 PSI) for each tyre. To reactivate the sensors, the vehicle must be driven above 40 km/h (25 MPH) for at least 9 minutes. When the sensors are activated, the driver information centre displays the current tyre pressures.
The BCM has the ability to detect malfunctions within the tire pressure monitor system. In the event a DTC is set, the tyre pressure monitor indicator icon on the instrument cluster will flash for 1 min. and then remain illuminated after the power switch is turned ON and the instrument cluster bulb check has been completed. Any malfunction detected will cause the driver information center to display a service tire monitor system type message.