This bulletin applies to 2016-2019 Chevy Cruze, 2018-2022 Equinox, 2016-2022 Malibu and 2021-2022 Trax vehicles, equipped with a turbo 1.4L or turbo 1.5L engine.
During cold weather operations, you may encounter DTC P0234 or P0299. The cause may be oil/moisture condensate freezing up in the turbo wastegate regulator solenoid valve (TCV).
Remove the turbocharger wastegate regulator solenoid valve. Drain the valve by turning it upside down. Using clean shop air regulated to 15-20 psi, blow all three ports for five seconds. Repeat this twice.
Check port #2 to verify that the spring gets lifted off the seat. This will be determined by the compressed air not dead-heading when applied to port #2. When applying air to this port, a small amount of air should be observed at port #3 and even less air will be noticed at port #1. If this does not happen, the TCV plunger may have hardened deposits from hot operating conditions which will impede TCV plunger movement, and the turbo wastegate regulator solenoid valve should be replaced.
