1.4L Engine Performance in Extremely Cold Weather

Some 2011-2016 Cruze; 2012-2020 Sonic; 2013-2022 Encore and Trax models equipped with the 1.4L engine (RPO LUV) may experience a loss of power or several other engine performance conditions along with an illuminated Check Engine MIL in extremely cold weather conditions. After driving for a period of time, the engine performance issues may seem to diminish.

The following DTCs may be set: P0299 (Engine Underboost), P0234 (Engine Overboost), P0236 (Turbocharger Boost Sensor Performance), P2227 (Barometric Pressure (BARO) Sensor Performance), P2261 (Turbocharger Bypass Valve Stuck) and P00C7 (Intake Air Pressure Measurement System – Multiple Sensors Not Plausible). These conditions also may cause an increase in crankcase pressure, resulting in potential oil leaks at seals and gaskets.

If the performance and drivability issues are present, check for ice blocking the crankcase vent tube, ice accumulation in the intake manifold blocking the PCV passage in the cylinder head, ice accumulation in the charge air cooler restricting air flow to the throttle body and contamination, such as water, oil or sludge, at the charge air bypass valve.

Disassemble and clean the charge air bypass valve if any contamination is found. (Fig 6) Replace the intake manifold and, if necessary, the charge air bypass valve.

 

Fig. 6

 

Turbocharger, Intake Manifold and Cylinder Head Inspection

If the desired boost pressure vs. the actual boost pressure is not within limits, but there is not any trouble found with the turbocharger wastegate actuator or turbocharger, do not replace the turbocharger. Clean the charge air bypass valve of any water/oil accumulation in the vacuum side port and replace the intake manifold.

In addition, inspect for any sludge/water/ice from the cylinder head, cam cover and PCV pipes, such as ice build-up blocking the cylinder head. (Fig. 7) If any contamination is found, replace the intake manifold.

 

Fig. 7

 

Intake Manifold Redesign

The new intake manifold has a redesigned intake positive pressure port location. (Fig. 8, #2) Solenoid location is forward of the electrical connector. (Fig 8, #3) The bypass valve vacuum feed is in the same location. (Fig. 8, #1)

 

Fig. 8

 

If the solenoid is loose, review the location of the electrical connector. If the connector is facing the cylinder head, it is installed backwards (Fig. 9) and should be removed and installed correctly. The solenoid is keyed and, if the tabs are reversed, the retainers will not be seated.

 

Fig. 9

 

For additional information and part numbers, refer to Bulletin #22-NA-067.

– Thanks to Matt Gager

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