What causes P0171, P0172, P0299 or P2227 on GM turbo engines?
GM has issued a preliminary service bulletin #PIP5540A addressing a poor engine performance issue and P0171, P0172, P0299 or P2227 on GM turbo engines. The poor performance and trouble codes appear in cold weather and affect the GM vehicles listed below.
Vehicles affected by #PIP5540A
2000-2018 GM engines equipped with a turbo
GM has determined that restricted airflow due to ice buildup in the air induction system is the cause of the poor engine performance and P0171, P0172, P0299 or P2227 on GM turbo engines. The problem occurs when temps dip below 32°F (0°C).
Fix for P0171, P0172, P0299 or P2227 on GM turbo engines
Start by inspecting the air induction system including charge air cooler on turbocharged engines. You’re looking for any ice that may be restricting the air flow or covering related pressure sensors.
If you detect ice, allow it to melt so that the moisture can be drained from the induction system including the charge air cooler without damaging sensors or components.
GM advises that this is a temporary fix that may have to be repeated. They are working on a permanent fix.Posted on by Rick Muscoplat