Engine Clicking And Tapping Noises Problems of GMC Sierra

Brake system failure 62 mph top speed; brake warning light; check engine light; abs light; traction control light; steering assist is reduced - drive with care; service trailer brake system. . . . Lights on dash as noted above. Brake pedal makes a clicking; power steering non-existent; brakes will not stop vehicle without max pressure. Happened at low speed. Bumped into cart at store before gaining control. After multiple shut downs and restarts all lights normal except check engine light. Brakes occasionally makes clicking sound without touching them. Mileage 6056.

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The contact owns a 2009 GMC Sierra. The contact stated that while driving at any speed, the service traction control and the stabilizer track control warning lights illuminated. In addition when driving over 50 mph, the engine made a clinking noise and then stalled. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 60,000.

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Valve tap on cold start lasts approximately one minute. GMC claims it is carbon build up in the combustion chamber and will not damage the engine. This is unsatisfactory. Any tapping sound is indicative of lack of lubrication and will prematurely wear the engine or its components particularly after warranty runs out. See service bulletin #01-06-01-028a. Or document #1271016 "engine knock on cold start".

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The consumer states that there is a tapping noise in the engine. The technician at the dealer stated that when cold started, there is a light tapping noise. (found bulletin #01-06-028 for cold start engine knock) no current fix at the time and should not have an effect on the longevity of any of the engine components, and may be caused by an interaction between carbon that has formed on the piston/the piston motion and cylinder wall.