2006 Cadillac P0174: What It Means & Is It Safe to Drive?
P0174 on the 2006 Cadillac: 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 2006 Cadillac
- 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 2006 Cadillac, repairs for P0174 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Cadillac
Cadillac 3.6L LGX/LFX P0174 alongside P0171 is a symmetric lean condition—MAF sensor failure or a large intake manifold vacuum leak affecting both banks. On XT5 and SRX, inspect the intake manifold gaskets at high mileage before replacing the MAF sensor.
Most commonly affected models
SRX 3.6L 2010–2016XT5 3.6L 2017–2022CTS 3.6L 2014–2019