GMC Sierra owners have reported 3 problems related to loud engine noise (under the engine and engine cooling category). The most recently reported issues are listed below.
When at a stop, the vehicle vibrated and made noises. The vehicle was taken to the dealer three times. The dealer said it was normal. The vehicle had a rough idle and made loud noises when air conditioner was on. When turned off, it made a louder noise. The vehicle was taken to the dealer a total of five times since then.
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all problems of the 2003 GMC Sierra
🔎.
Consumer stated engine valve was knocking. As a result a loud noise came from the vehicle.
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all problems of the 2000 GMC Sierra
🔎.
Extreme noise in engine for first 20-30 seconds at cold startup. Regional factory rep. States "perfectly normal" and is a known problem. No fix at this time.
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all problems of the 2001 GMC Sierra
🔎.