Some units of the Buick Encore equipped with the turbocharged 1.4L I4 LUV gasoline engine may exhibit performance issues in extremely cold weather. Luckily, a few possible causes for these issues have been identified, as well as related fixes to be performed by dealer technicians.
According to a recent post from GM TechLink, some units of the 2013 through 2021 Buick Encore may exhibit a power loss in cold weather, as well as several other performance-related issues. These issues may occur in conjunction with a Check Engine Malfunction Indicator Lamp (MIL). The issues may also subside after driving. An oil leak may be observed from seals and gaskets as the result of an increase in crankcase pressure.
Additionally, vehicles which exhibit these issues may throw one or several of the following Diagnostic Trouble Codes (DTCs):
- P2261 (Turbocharger Bypass Valve Stuck)
- P2227 (Barometric Pressure (BARO) Sensor Performance)
- P0299 (Engine Underboost)
- P0234 (Engine Overboost)
- P0236 (Turbocharger Boost Sensor Performance),
- P00C7 (Intake Air Pressure Measurement System – Multiple Sensors Not Plausible)
Per GM TechLink, these issues could be the result of ice blockage in the engine bay. Specifically, GM TechLink recommends that technicians check for blockage around the crankcase vent tube and on the intake manifold, with ice possibly blocking the PCV passage in the cylinder head. Ice may also block air in the charge air cooler, restricting flow to the throttle body, while the charge air bypass valve could be contaminated as well.
To fix these issues, GM recommends that a technician disassemble and clean the charge air bypass valve if it’s contaminated, and replace the intake manifold. The charge air bypass valve may also need to be replaced.
If the Buick Encore engine is not producing adequate boost, but the turbo wastegate actuator and turbocharger are both functioning properly, GM says that the turbo does not necessarily need to be replaced. Instead, the charge air bypass valve may need to be cleared of water or oil accumulation on the vacuum side port, while the intake manifold should be replaced. The intake manifold may also need to be replaced if contamination from the cylinder head, cam cover, or PCV pipes is found.