2019 Buick P0174: What It Means & Is It Safe to Drive?
P0174 on the 2019 Buick: System Too Lean (Bank 2). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Same as P0171 but for bank 2. The engine is running too lean on the side that contains cylinder 2.
Common causes on the 2019 Buick
- Vacuum leaks affecting bank 2
- Faulty MAF or O2 sensor
- Fuel delivery issues
Symptoms
- Check Engine Light
- Rough idle, hesitation
- May appear with P0171 on V6/V8 engines
Typical fixes
- Smoke test for vacuum leaks
- Inspect intake gaskets and hoses
- Check fuel pressure and filter
Repair cost range
For a 2019 Buick, repairs for P0174 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Buick
Buick 3.6L LFX/LGX P0174 alongside P0171 indicates a symmetric cross-bank lean condition—MAF sensor error or a large vacuum leak at the intake plenum are the primary causes on these V6 engines.
Most commonly affected models
Enclave 3.6L 2008–2017LaCrosse 3.6L 2010–2016Verano 2.4L 2012–2017