p0174
Moderate
Chevrolet · Trucks
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Chevrolet Trucks means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CK15706Colorado LT 2024Colorado Trail Boss 2024Colorado WT 2024Colorado Z71 2024Colorado ZR2 2024Silverado 1500 Custom 2024Silverado 1500 High Country 2024Silverado 1500 LT 2024Silverado 1500 LT Trail Boss 2024Silverado 1500 LTZ 2024Silverado 1500 RST 2024Silverado 1500 WT 2024Silverado 1500 ZR2 2024Silverado 2500HD High Country 2024Silverado 2500HD LT 2024Silverado 2500HD LTZ 2024Silverado 2500HD WT 2024CL14543CS10403CK10743CK10543CK20943CK30943CK10906
Likely Causes
How to Fix It
1
Perform a smoke test on the intake system to locate vacuum leaks
2
Inspect and clean the MAF sensor with appropriate cleaner
3
Test fuel pressure at the fuel rail with a pressure gauge
4
Check the PCV valve for proper operation and replace if stuck
5
Test the bank 2 upstream O2 sensor with a scan tool for proper switching
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
PCV valve
Intake manifold gaskets
O2 sensor (bank 2 upstream)
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