Noticed a peculiar exhaust note somewhat like a tick that was reminescent of an exhaust leak. Took vehicle to local muffler exhaust shop and they inform me it is a manifold exhaust leak due to broken bolt(s) on the driver side. Was able to look for myself and I see one bolt head missing in the very back near the firewall.

- Melrose Park , IL, USA

The contact owns a 2006 Chevrolet Silverado. The contact stated that while driving at approximately 10 mph, the vehicle stalled without warning. The failure occurred on two occasions. The vehicle was taken to an independent mechanic where the failure could not be duplicated. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 90,000.

- Charlotte, NC, USA

2006 duramax lbz. From new truck intermittently has code P003A - turbocharger boost control position not learned, P0087 low fuel pressure and change fuel filter display on dash. Truck is totally stock. First couple of times when at dealer they would do diagnostics and change fuel filter saying that was it and they would reset all codes. No drivability issues when this happened. Recently (August 5, 2014) while traveling pulling a trailer truck went into derate/limp mode (first time) all codes returned. Took to dealer, changed fuel filter and reset codes now it is happening about weekly October 1, 2014 took to dealer reset codes did not change filter as it was just done and they did not find anything wrong with fuel. (miles 94000) dealership said everything checks normal and Chevrolet does not show and bulletins for this issue.

- Oak Grove, MO, USA

Duramax diesel turbocharger replacement. Second identical occurrence, see ODI number 10522941. Work order states "customer states the check engine light came on this morning. Advise. Dtc P2563=turbocharger boost control. System test found turbo vane sticking in turbo. Control solenoid and position sensor operating. Replace turbocharger and all needed seals and gaskets. Reprogram ECM as needed. Fill cooling system." This second P2563 trouble code and turbocharger replacement, 28,342 miles since the first replacement, cost me $2,889.74. There seems to be a trend of this specific failure.

- Colorado Springs, CO, USA

Duramax diesel. Check engine light came on when started. Invoice stated code was: "check engine light is on. The vanes inside aren't working. P2563=turbocharger boost control. Command solenoid with tech2, won't operate solenoid not operating. Replace solenoid and retest. Solenoid now operates but tc vane place stops/sticks at 69% and won't move. Remove and replace turbocharger position sensor to inspect. Vane cam won't move. Tac case #11223434. See ro for details. Replace turbocharger, clear dtc, relearn tc position and retest." Turbocharger replaced under original warranty with $100 deductible.

- Colorado Springs, CO, USA

There has been a long time problem of broken exhaust manifold bolts on 1999 to 2007 Chevy Silverado and GMC Sierra pickups. This problem is on 80 to 90 percent of the trucks with in them years this is millions of vehicles on the road. These vehicles should be recalled by General Motors due to epa laws and emission standards not being able to be passed when these bolts break.

- Sylvester, GA, USA