Cobalt L4-2.2L (2008)
Tires: Customer Interest
Tires - Tire Goes Flat/TPMS Lamp ON
Bulletin No.: 07-03-16-003
Date: October 15, 2007
TECHNICAL
Subject:
Tire Slowly Goes Flat, Tire Pressure Light On, Check Tire Pressure Message on DIC, Low Tire Pressure (Replace Tire Pressure Monitoring [TPM]
Sensor Washer and Seal [Grommet])
Models:
2008 Chevrolet Cobalt
2008 Pontiac G5
with 15" Tires (RPO QTU)
Condition
Some customers may comment on any of the following conditions:
A tire that slowly goes flat
The tire pressure light is on
The check tire pressure message appears on the DIC
Low tire pressure
Cause
This condition may be caused by an air leak around the TPM sensor due to a damaged seal (grommet).
Correction
Remove the tire and wheel assembly from the vehicle.
Inflate the tire and dip the tire/wheel assembly in a water bath or use a spray bottle with soap and water to locate the specific leak location.
If the TPM is found to have a leak at the retainer nut to wheel interface, proceed with next step.
Install the tire and wheel assembly to the tire changer and deflate the tire completely.
Break ONLY the outer bead.
Remove the tire pressure sensor nut and the sensor from the wheel.
Remove the old washer and seal (grommet) from the sensor.
