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September 1, 2023 Service bulletin

This Preliminary Information communication provides information to the technician of a complaint of a sag...

Chevrolet technical service bulletin PIP4112T for 2008-2013 Chevrolet Malibu, 2007-2018 Chevrolet Silverado 1500 and 2012-2013 Chevrolet Impala and others.

Bulletin number
PIP4112T
Component
Engine and engine cooling
Summary
This Preliminary Information communication provides information to the technician of a complaint of a sag or hesitation when accelerating. The concern is present when coasting at low speeds of less than 15 miles per hour and then aggressively applying the throttle, or after making a hard stop followed by an aggressive throttle. This concern may also be present while cruising at highway speeds and then an aggressive increase in throttle. This is considered normal operation of the vehicle the throttle is delayed and opened slowly up to .7 seconds to help minimize driveline lash and clunking or will have approximately .5 seconds of zero torque to allow the transmission to shift to downshift.

Owners of these vehicles have filed 8,844 complaints in the engine category.

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