TPMS accuracy
Pro
Joined: Sep 2014
Posts: 701
Likes: 179
From: Muskoka ontario
And if you want an even greater degree of accuracy, use the metric display, in Kilopascals. 30 PSI is roughly 210KpA and that is a much finer scale than PSI. I know the Canadian cars go both ways... i imagine the US cars have it as a configurable option.
The biggest challenge is to get all 4 wheels to the same numbers in KpA.
You can even tell which side of the car is exposed to the sun... the numbers are like 10KpA higher.
The biggest challenge is to get all 4 wheels to the same numbers in KpA.
You can even tell which side of the car is exposed to the sun... the numbers are like 10KpA higher.
A guy with the name " DickieDoo" talks about going "both ways"............
You just can't make that stuff up.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
The TPMS will read lower pressure at altitudes above sea level.
Racer
Joined: Aug 2011
Posts: 337
Likes: 1
From: Westchester Co. NY
If the tech has never a need to do this, then he or she would not know of it. It took us 3 trips to the Chevy dealers until they finally figured out how to do it.
If in fact there is no such procedure as you say, then that would imply that a car delivered in a high altitude state would have incorrect TPMS readings from day one. And I would expect many complaints to the dealerships about that.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
We had this procedure done on my daughter's Cruze when she moved from New York to Colorado. I'd be very surprised if it could not also be done on any other GM car.
If the tech has never a need to do this, then he or she would not know of it. It took us 3 trips to the Chevy dealers until they finally figured out how to do it.
If in fact there is no such procedure as you say, then that would imply that a car delivered in a high altitude state would have incorrect TPMS readings from day one. And I would expect many complaints to the dealerships about that.
If the tech has never a need to do this, then he or she would not know of it. It took us 3 trips to the Chevy dealers until they finally figured out how to do it.
If in fact there is no such procedure as you say, then that would imply that a car delivered in a high altitude state would have incorrect TPMS readings from day one. And I would expect many complaints to the dealerships about that.
If this reset can be done, then the chevy service manual would say how to do it. I can't find the procedure any where. If anyone can, please post.
NOMRW8NG: If I had to bet, I'd say the dealer just added air (above what is best pressure) until the TPMS read the value wanted. Check her tires with a good gauge and I'll bet they read high compared to the TPMS.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Wow! There is so much BAD, WRONG, information out there. Even Tire rack gets it all F***ked up.
If this reset can be done, then the chevy service manual would say how to do it. I can't find the procedure any where. If anyone can, please post.
NOMRW8NG: If I had to bet, I'd say the dealer just added air (above what is best pressure) until the TPMS read the value wanted. Check her tires with a good gauge and I'll bet they read high compared to the TPMS.
If this reset can be done, then the chevy service manual would say how to do it. I can't find the procedure any where. If anyone can, please post.
NOMRW8NG: If I had to bet, I'd say the dealer just added air (above what is best pressure) until the TPMS read the value wanted. Check her tires with a good gauge and I'll bet they read high compared to the TPMS.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
I would say this myth is busted.
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Racer
Joined: Aug 2011
Posts: 337
Likes: 1
From: Westchester Co. NY
Wow! There is so much BAD, WRONG, information out there. Even Tire rack gets it all F***ked up.
If this reset can be done, then the chevy service manual would say how to do it. I can't find the procedure any where. If anyone can, please post.
NOMRW8NG: If I had to bet, I'd say the dealer just added air (above what is best pressure) until the TPMS read the value wanted. Check her tires with a good gauge and I'll bet they read high compared to the TPMS.
If this reset can be done, then the chevy service manual would say how to do it. I can't find the procedure any where. If anyone can, please post.
NOMRW8NG: If I had to bet, I'd say the dealer just added air (above what is best pressure) until the TPMS read the value wanted. Check her tires with a good gauge and I'll bet they read high compared to the TPMS.
When we bought the car here in NY, the TPMS and the tire gauge read the same. Then we drove 1800 miles to Colorado Springs, elevation 6500 feet. Once there, the TPMS read 3-4 lbs lower than the gauge. In general, this wasn't a problem until the winter, when the temperature swings were large and often the TPMS light would be on. Two trips to the dealer, and all they did was add air to the tires. We knew this because we checked with a gauge. It was a tech at Discount Tire who told us that the problem could be corrected (and that DT was going to be getting the necessary tool to do it). So a third trip to the dealer and finally they fixed it. Here's a snip of the work order.
Last edited by NOMRW8NG; Jan 28, 2017 at 06:22 AM.
Racer
Joined: Aug 2011
Posts: 337
Likes: 1
From: Westchester Co. NY
It's not a myth, see my post above.
Racer
Joined: Aug 2011
Posts: 337
Likes: 1
From: Westchester Co. NY
Sorry, I don't know exactly what they did, but I think it's more than just disconnecting the battery. Discount Tire had said that they needed "a special tool" to do the reset, and did say they would be getting one, so that makes it sound like it more than just a battery disconnect.
Last edited by NOMRW8NG; Jan 28, 2017 at 11:57 AM.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
6Speeder: Thanks for stating the obvious (check with a tire gauge).
When we bought the car here in NY, the TPMS and the tire gauge read the same. Then we drove 1800 miles to Colorado Springs, elevation 6500 feet. Once there, the TPMS read 3-4 lbs lower than the gauge. In general, this wasn't a problem until the winter, when the temperature swings were large and often the TPMS light would be on. Two trips to the dealer, and all they did was add air to the tires. We knew this because we checked with a gauge. It was a tech at Discount Tire who told us that the problem could be corrected (and that DT was going to be getting the necessary tool to do it). So a third trip to the dealer and finally they fixed it. Here's a snip of the work order.
When we bought the car here in NY, the TPMS and the tire gauge read the same. Then we drove 1800 miles to Colorado Springs, elevation 6500 feet. Once there, the TPMS read 3-4 lbs lower than the gauge. In general, this wasn't a problem until the winter, when the temperature swings were large and often the TPMS light would be on. Two trips to the dealer, and all they did was add air to the tires. We knew this because we checked with a gauge. It was a tech at Discount Tire who told us that the problem could be corrected (and that DT was going to be getting the necessary tool to do it). So a third trip to the dealer and finally they fixed it. Here's a snip of the work order.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
Well, I checked with two more service writers and two other Corvette techs. No one has ever heard of resetting the ECM to allow the TPMS to read correctly at altitude. I also went through the service manual and could find no information on this, at least for Corvettes.
I'm still calling this busted, for C5's, C6's, and C7's.
If someone has had this fixed for a Corvette, please let us know, cause those of us in the nosebleed section would like to know.
I'm still calling this busted, for C5's, C6's, and C7's.
If someone has had this fixed for a Corvette, please let us know, cause those of us in the nosebleed section would like to know.