00-00-90-002K Information on Proper Tire Pressure - (Sep 14 2012) Tires
|Subject:||Information on Proper Tire Pressure|
|Models:||2013 and Prior GM Passenger Cars and Light Duty Trucks|
This bulletin is being revised to add model years. Please discard Corporate BulletinNumber?00-00-90-002J (Section 00 – General Information).
Important:Adjustment of tire pressure for a customer with a Low Tire Pressure Monitor (TPM)light on and no codes in the TPM system is NOT a warrantable repair. Claims to simplyadjust the tire pressure will be rejected.ALL tires (including the spare tire) MUST be set to the recommended inflation pressurestated on the vehicle's tire placard (on driver's door) during the PRE-DELIVERY INSPECTION(PDI). Recommended inflation pressure is not the pressure printed on tire sidewall.Tires may be over-inflated from the assembly plant due to the mounting process.Generally a 5.6°C (10°F) temperature change will result in (is equivalent to) a 6.9?kPa(1?psi) tire pressure change.2008-2009 HUMMER H2 Only – The H2 comes standard with Light Truck “D” Load Rangetires with a recommended cold inflation pressure of 289?kPa (42?psi). These tireswill alert the driver to a low pressure situation at roughly 262?kPa (38?psi) dueto a requirement in FMVSS 138 which specifies a Minimum Activation Pressure for eachtire type. This creates a relatively narrow window of “usable” pressure values andthe warning will bemore sensitive to outside temperature changes during the colder months.
As with other cold temperature/tire pressure issues, there is nothing wrong withthe system itself. If a vehicle is brought in with this concern, check for tire damageand set all tires to the Recommended Cold Inflation Pressure shown on the vehicleplacard.
Accurate tire pressures ensure the safe handling and appropriate ride characteristicsof GM cars and trucks. It is critical that the tire pressure be adjusted to the specificationson the vehicle's tire placard during PDI.
Ride, handling and road noise concerns may be caused by improperly adjusted tire pressure.
The first step in the diagnosis of these concerns is to verify that the tires areinflated to the correct pressures. The recommended tire inflation pressure is listed on the vehicle's tire placard. The tire placard is located on the driver's side front or rear door edge, centerpillar, or the rear compartment lid.
Tip:Generally a 5.6°C (10°F) temperature increase will result in (is equivalent to) a6.9?kPa (1?psi) tire pressure increase.The definition of a "cold" tire is one that has been sitting for at least 3 hours,or driven no more than 1.6?km (1?mi).On extremely cold days, if the vehicle has been outdoors, it may be necessary to compensatefor the low external temperature by adding additional air to the tire during PDI.During cold weather, the Tire Pressure Monitor (TPM) indicator light (a yellow horseshoewith an exclamation point) may illuminate. If this indicator turns off after the tireswarm up (reach operating temperature), the tire pressure should be reset to placardpressure at the cold temperature.The TPM system will work correctly with nitrogen in tires.The TPM system is compatible with the GM Vehicle Care Tire Sealant but may not bewith other commercially available sealants.