GM does not install TPMS devices in spare tires. I had a flat tire in snowy conditions 100+ miles from the nearest place for assistance. After putting on the spare tire the DIC (driver information center) displayed no air in tire. That-??s because a TPMS doesn-??t exist in spare tires. I started driving a my four wheel drive turned off. I turned it back on and after a very short distance it turned off again. Since the vehicle determined I didn-??t have air in one of the tires (spare previously mentioned) the four wheel drive shouldn-??t work to prevent damage. I needed the four wheel drive in the snow so I had to proceed at approximately 25 mph. This is a safety issue for not only my vehicle but others on the roadways. I contacted the dealer that had no idea about the problem and neither did the national GM customer support center. There is a tool that -??tells-?? the vehicle where each tire is located so that is low tire pressure occurs the driver would know which tire needs attention. If a TPMS was installed from the factory and a flat occurred, spare installed then the four wheel drive would function. If a flat subsequently occurred the driver would still be alerted but wouldn-??t know tire was involved. Visual check would find it. Either this or have GM provide an override so the trip could be continued safely. I believe that this situation applies to any four wheel drive vehicle not just GM and should be resolved if the NHTSB would initiate an investigation.

- Waynesville, NC, USA

The contact owns a 2021 Chevrolet Tahoe. The contact stated that while driving at approximately 35 MPH, he heard an abnormal sound coming from the front tires. The contact stated that the abnormal tire sound was constant and was occurring at various speeds. Additionally, the contact stated that the vehicle was occasionally failed to start. The contact stated that there was no starter motor sound or even the sound of clicking when the ignition key was turned. The contact stated that the failure was intermittent. The contact had taken the vehicle to a local dealer, where it was diagnosed; however, the failure could not be duplicated. The vehicle was not repaired. The contact stated that the failure had reoccurred. The manufacturer was informed of the failure. The failure mileage was 45,844.

- Pompano Beach, FL, USA

While driving on a residential street during daylight hours, on a clear day at approximately 20 miles per hour the right wheel on my car dislodged. ?This caused me to lose control of steering the vehicle and strike a parked car. ?There were people walking about on the sidewalk at the time and other cars traveling. ?When I exited the car I saw that the passenger side was completely on the ground and there were broken pieces and liquid coming from underneath the car. ?The axel was broken with a clean break. ?The car was then towed to the dealership where I was informed it could not stay. ?My insurance company then towed it to their repair shop where upon assessing the damage they could tell that this was not caused by a collision. ?General Motors along with our independent investigator examined the parts and vehicle. Leaving me without a vehicle for 4 months. ?Our Insurance investigator determined this was a defect in manufacturing and GM did not agree. ?General Motors will not communicate with us any further on this matter. ?Some of the repairs that were made was the left front and CV axel, also the left front aluminum steering knuckle was missing. ?This should be investigated for metallurgical discrepancies by an independent lab. ?While the car was being inspected there was a recall to the power steering that may apply to the vehicle. ?I would like for the NHTSA to investigate this issue. ?The car has been repaired and is in my possession and my insurance company has all of the reports, documents, and parts regarding the investigation. ?I also have pictures immediately following and a witness to the incident. Had a been traveling on a highway at a higher rate of speed this could have been fatal. ?Your assistance in this matter would be greatly appreciated.

- Rahway, NJ, USA