Reduced engine power may occur on some 2018-2022 Malibu, Equinox and Terrain models equipped with the 1.5L engine (RPO LYX, LFV) along with one or more of the following DTCs set in the Engine Control Module: P0101 (Mass Air Flow (MAF) Sensor Performance), P0172 (Fuel Trim System Rich), P0299 (Engine Underboost), P0506 (Idle Speed Low) and P1101 (Intake Air Flow System Performance). These conditions may be caused by the Charge Air Cooler (CAC) outlet tube being separated from the throttle body.
If these conditions are found, check the CAC outlet tube connection at the throttle body. If the tube is disconnected, inspect the CAC tube, tube retainer clip and throttle body for any damage. In some cases, there may be damage that requires replacement of the CAC tube or throttle.
TIP: The throttle body and mass airflow sensor associated with the set DTCs should not be replaced unless they are damaged or found to be the cause of the code.
Normal witness marks on the throttle body do not require replacement. (Fig. 4)
Fig. 4
Look for abnormal marks or damage, which indicate the throttle body to the replaced. (Fig. 5)
Fig. 5
If the CAC outlet tube is disconnected from the throttle body, also check the tube end for contact damage or a missing O-ring seal. Replace the tube assembly if the tube is damaged or the O-ring seal is missing.
Refer to Bulletin #22-NA-224 for more information.
– Thanks to Matt Gager
Updated December 2, 2022
Thanks. The article has been updated with the additional RPO.
I believe the correct engine designation would be LFV, not LYX, which is not installed in Malibu.