P0175 on the 2024 Chevrolet Silverado
A P0175 code on your 2024 Chevrolet Silverado 1500 means the ECM has detected a rich fuel condition on Bank 2. The 2024 Silverado offers multiple engine options: the 2.7L Turbo High-Output four-cylinder (310 hp), the 5.3L V8 (355 hp), the 6.2L V8 (420 hp), and the 3.0L Duramax diesel. For gasoline engines, Bank 2 on the V8s is the passenger side (right bank). On the 2.7L turbo four-cylinder, the P0175 designation refers to a secondary monitoring position.
V8 Engines and P0175
The 5.3L and 6.2L V8s in the Silverado use GM's Dynamic Fuel Management (DFM), which can deactivate individual cylinders for fuel economy. This cylinder deactivation system means the ECM is constantly adjusting which cylinders fire and how much fuel each receives. When DFM interacts with a marginal O2 sensor or dirty MAF, the fuel trim corrections can be amplified, triggering P0175 more readily.
Symptoms
- Check engine light illuminated on the display
- Fuel economy below the rated 16/24 MPG (5.3L) or 15/22 MPG (6.2L)
- Black smoke from exhaust during acceleration
- Rough idle or V8 stumble
- Reduced towing power or sluggish throttle response
- Fuel smell from tailpipe
- DFM transitions may feel rougher than normal
Most Common Causes
1. Bank 2 Upstream O2 Sensor
The upstream O2 sensor on the passenger side monitors exhaust from Bank 2 cylinders. On a new 2024 model, a failing sensor is a warranty-covered defect. On V8 engines with DFM, the sensor must handle varying exhaust composition as cylinders activate and deactivate, adding complexity to its operation. A sensor that cannot keep up with DFM transitions triggers fuel trim errors.
2. MAF Sensor Contamination
The Silverado is a full-size truck frequently used in dusty work environments. The MAF sensor in the intake tube can accumulate contamination from dust, oil mist, and PCV system blow-by. On the 2.7L turbo, the MAF is before the turbo inlet where it is also exposed to reverse oil mist from turbo bearing seals. Cleaning is the first diagnostic step.
3. Fuel Injector Issue
The 5.3L and 6.2L V8s use direct injection. A direct injector on Bank 2 that leaks or has carbon buildup delivers more fuel than commanded. The 2.7L turbo also uses direct injection at high pressures. On a new truck, an injector defect is a manufacturing issue. On the V8s, look for companion misfire codes on specific Bank 2 cylinders.
4. Fuel Pressure Regulator or Pump Issue
The high-pressure fuel system on the Silverado is cam-driven on the V8s. If the fuel pressure exceeds target, every injection pulse delivers more fuel than intended. This typically affects both banks but Bank 2 may trigger first. Check fuel rail pressure against specification with a scan tool.
Diagnostic Steps
- Identify your engine type (2.7L, 5.3L, or 6.2L)
- Scan for all codes including DFM-related and misfire codes
- Monitor Bank 1 and Bank 2 fuel trims at idle and 2,500 RPM
- Clean the MAF sensor
- Test Bank 2 upstream O2 sensor with live data
- Check fuel rail pressure against specification
- Inspect injectors via balance test
- On the 2.7L turbo, check charge air system integrity
Repair Costs
Under warranty on a 2024 model: free. Otherwise: O2 sensor $150-$350, MAF cleaning under $15, injector $250-$700, fuel pressure regulator $200-$500. The 2024 Silverado is under GM's 3-year/36,000-mile bumper-to-bumper and 5-year/60,000-mile powertrain warranty.
Priority
Address P0175 promptly on a new Silverado. The warranty covers the repair at no cost, and running rich during the break-in period is particularly undesirable. Oil dilution from excess fuel washing past piston rings can accelerate engine wear during the critical first 10,000 miles.