What does code P0174 mean on a Cadillac and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Cadillac, what usually causes it, what repairs typically cost, and how safe it is 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 for your 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 Cadillac, repairs for P0174 often fall between $100 and $600, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
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