What does code P0174 mean on a Pontiac and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Pontiac, 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 Pontiac
- 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 Pontiac, 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 Pontiac
Pontiac V6 P0174 Bank 2 lean on the 3.5L and 3.9L V6 is typically a dirty MAF sensor or a vacuum leak at the intake manifold gasket. On 3.8L Grand Prix, the supercharger front cover can develop a small vacuum leak that causes a lean condition on Bank 2—inspect around the supercharger mounting.
Most commonly affected models
G6 3.5L V6 2006–2010Grand Prix 3.8L V6 2004–2008Montana 3.9L 2006–2008