Fuel Trim Cylinder Balance -- Bank 2 (GM)
What does P1175 mean?
The P1175 code means the vehicle's onboard diagnostic system has detected: Fuel Trim Cylinder Balance -- Bank 2 (GM). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough idle or misfire
- Poor fuel economy
- Engine vibration at idle
- Hesitation during acceleration
Probable Causes (Ranked by Likelihood)
- Dirty or clogged fuel injector on one bank 2 cylinder Very High
- Intake manifold gasket leak on bank 2 High
- Worn spark plugs or ignition coils on bank 2 Moderate
- Low compression on one bank 2 cylinder Moderate
- Carbon buildup on intake valves (GDI engines) Low
Step-by-Step Diagnostic Procedure
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Check freeze frame data to identify which cylinder is at fault
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Perform a fuel injector balance test on bank 2
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Check for vacuum leaks specific to bank 2 cylinders
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Inspect spark plugs and ignition coils on bank 2
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Perform a compression test on bank 2 cylinders if other tests are inconclusive
Frequently Asked Questions
Can I drive with code P1175?
You can drive short distances. Like P1174, a single cylinder on bank 2 has a fuel balance issue. The engine may misfire at idle.
What is the difference between P1174 and P1175?
P1174 is for bank 1 and P1175 is for bank 2. If both codes are present, a common cause affecting both banks (like fuel pressure) may be the issue rather than individual cylinder problems.
Is P1175 serious?
It is moderately serious. While it may not prevent you from driving, an unaddressed fuel imbalance can cause catalyst damage, increased emissions, and reduced engine life over time.