p0171
Moderate
Chevrolet · SUVs
System Too Lean Bank 1
Quick Answer
Error code P0171 on your Chevrolet SUVs means: System Too Lean Bank 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CL14636CL14606Blazer LT 2024Blazer Premier 2024Blazer RS 2024Equinox Activ 2024Equinox LT 2024Equinox RS 2024Suburban High Country 2024Suburban LS 2024Suburban LT 2024Suburban Premier 2024Suburban RST 2024Tahoe High Country 2024Tahoe LS 2024Tahoe LT 2024Tahoe Premier 2024Tahoe RST 2024Tahoe Z71 2024Trailblazer Activ 2024Trailblazer LS 2024Trailblazer LT 2024Trailblazer RS 2024Traverse LS 2024Traverse LT 2024Traverse Premier 2024Traverse RS 2024Traverse Z71 2024Trax Activ 2024Trax LS 2024Trax LT 2024Trax RS 2024CL14526CL14506CK10906CK10706CL14456CL14806CL14416
Likely Causes
How to Fix It
1
Inspect intake manifold and all vacuum hoses for cracks, splits, or disconnections
2
Remove and clean the MAF sensor with MAF-specific cleaner; replace if damaged
3
Test fuel pressure at the rail with a fuel pressure gauge
4
Check for exhaust leaks at the exhaust manifold and upstream O2 sensor area
5
Clear the code and test drive to confirm the repair
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
MAF sensor or MAF cleaner
Vacuum hoses
Fuel filter
Intake manifold gaskets
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