How To Fix A P0171 Error Code On Your Chevy Cruze According to GM's Technical Service Bulletin (TSB), an improperly seated oil fill cap or dipstick tube can be the cause.

Whether it's just from a routine scan or a result of a check engine light, discovering a P0171 could lead to various problems that have varying costs.

P0171 Error Code: What It Is And How to Fix It If your car has a rough, erratic idle and triggers the P0171 error code, there's likely an issue with the air-to-fuel ratio.