p0174
Moderate
GMC · SUVs
System Too Lean (Bank 2)
Quick Answer
Error code P0174 on your GMC SUVs means: System Too Lean (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Connect OBD-II diagnostic scanner
2
Inspect fuel system pressure
3
Check for vacuum leaks
4
Test oxygen sensors
5
Inspect fuel filter condition
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
Oxygen sensor
Fuel filter
Fuel pump
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