Certain examples of the GMC Terrain may exhibit a reduction in engine power. Now, a possible cause for this issue has been identified, as well as a related fix to be performed by a GM technician.
Per a recent report by GM TechLink, some units of the 2018 through 2022 GMC Terrain equipped with the turbocharged 1.5L I4 LYX gasoline engine may exhibit reduced engine power, plus one or more related diagnostic trouble codes (DTCs) as a result of the engine Charge Air Cooler (CAC) outlet tube separating from the engine throttle body. As a reminder, the GMC Terrain’s turbocharged 1.5L I4 LYX gasoline engine is rated at 170 horsepower at 5,600 rpm and 203 pound-feet of torque at 2,000 rpm, with output directed through the GM nine-speed automatic transmission.
In addition to reduced engine power, affected units of the GMC Terrain may also trigger one or more of the following DTCs:
- P0101 (Mass Air Flow (MAF) Sensor Performance)
- P0172 (Fuel Trim System Rich)
- P0299 (Engine Underboost)
- P0506 (Idle Speed Low)
- P1101 (Intake Air Flow System Performance)
If GMC Terrain owners encounter the conditions outlined above, GM recommends that the vehicle be inspected by a GM technician. GM will instruct technicians to check the vehicle CAC outlet tube connection at the engine throttle body, and if the tube is disconnected, the CAC tube, tube retainer clip, and throttle body should all be inspected for damage. In the event that the CAC tube or throttle body are damaged, these components may need to be replaced.
Damage to the throttle body includes chips and scoring around the ridge located in the middle of the throttle body. However, normal witness marks around the throttle body will not indicate that the component needs replacement. Furthermore, if the CAC outlet tube is disconnected from the throttle body, it’s recommended that a GM technician check the tube end for contact damage or a missing O-ring seal. If the tube is damaged or the seal is missing, the tube assembly should be replaced.
To note, a similar issue and fix was reported for 2018 through 2022 Chevy Malibu models equipped with the turbocharged 1.5L I4 LFV gasoline engine, while the issue may also be found in some Chevy Equinox units.