Chevrolet Malibu owners have reported 3 problems related to car slowed down on its own (under the vehicle speed control category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Chevrolet Malibu based on all problems reported for the Malibu.
This has happened twice now, once for my wife and the second time I was driving. Both incidents happened while in motion on the highway and the vehicle display showed reduced engine power and the vehicle DE-rated and slowed automatically on the highway. The check engine light displayed and after connecting a code reader to the obd and code p2138 was logged which is potentially a faulty throttle position sensor/ foot gas pedal. I replaced the throttle position sensor cleared the stored code and a couple weeks later the vehicle again went into limp mode and DE-rated on highway. The check engine light came on and the same code p2138 was logged indicating voltage difference between app sensor 1 and app sensor 2 of the throttle positioning sensor. After further research on line I found that a gm service bulletin was issued for potential moisture intrusion of the connectors from the throttle position sensor to the ecm. (see attached) it seems like my vehicle is experiencing moisture in the connectors as both incidents happened within minutes of taking the vehicle through an automatic car wash. In my opinion this is a safety concern for this model vehicle to DE-rate and slow down suddenly at highway speeds with cars following behind and has been a known issue by gm and should have a recall issued.
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all problems of the 2014 Chevrolet Malibu
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While driving on highway check engine light came on and engine power reduxe light came on dash. Vehicle decelerated rapidly on major highway was almost rear ended by semi tractor triailer. Was able to turn car off and it went away. But has returned next day. I contacted gm 09/21/20 amd they stated they were aware of ongoing issues and I could bring it in to get looked at but would have to pay a diagnostic fee.
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all problems of the 2017 Chevrolet Malibu
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Vehicle slowed to 10 mph rapidly without warning in traffic. Was one half mile from entering interstate. Car was hauled to dealer.
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all problems of the 2013 Chevrolet Malibu
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