P0175 on the 2023 Chevrolet Tahoe
A P0175 code on your 2023 Tahoe signals that Bank 2 is running too rich. The 2023 Tahoe offers the 5.3L V8 (L84, 355 hp), 6.2L V8 (L87, 420 hp), and 3.0L Duramax diesel. Both V8s use direct injection and Dynamic Fuel Management. Bank 2 is the passenger side on all V8 configurations. As a relatively new vehicle, P0175 on the 2023 Tahoe is more likely a sensor defect or contamination issue than a wear-related failure.
Refined Fifth Generation
The 2023 Tahoe benefits from refinements made since the 2021 launch. Component quality has been improved, and software calibrations updated. P0175 on a 2023 model is an uncommon occurrence that likely represents an individual component issue rather than a systemic problem.
Symptoms
- Check engine light active on the large display
- Fuel economy below rated specifications
- Visible black exhaust during acceleration
- V8 idle quality diminished
- DFM transitions may feel rough
- Fuel smell from exhaust
- Towing performance may feel reduced
Causes
1. O2 Sensor Defect
On a low-mileage 2023 model, a failing O2 sensor is a manufacturing defect. The Bank 2 upstream sensor may have a contaminated element, faulty heater circuit, or internal wiring issue. This is a warranty replacement at the dealer. Test with live data to confirm the sensor is not switching properly.
2. MAF Sensor Contamination
Even at low mileage, PCV blow-by during engine break-in can coat the MAF sensor. If the Tahoe operates in dusty environments or tows frequently (which increases crankcase pressure), contamination builds faster. A quick cleaning may resolve the code immediately.
3. Direct Injector Manufacturing Issue
A factory-defective injector that does not seal properly can cause rich running on a specific cylinder bank. Check for companion misfire codes on Bank 2 cylinders. This is a warranty repair.
4. ECM Software
GM continuously refines software calibrations. A TSB may exist for the 2023 Tahoe that addresses fuel trim calibration. Ask the dealer to check for pending updates.
Action Plan
- Take the 2023 Tahoe to the Chevrolet dealer for warranty diagnosis
- Ask about TSBs for P0175 on the 2023 Tahoe V8
- Clean the MAF sensor as a quick check if convenient
- Document all symptoms for the dealer
Costs
Under warranty: free. All repairs should be covered on the 2023 model. GM's 3-year/36,000-mile bumper-to-bumper and 5-year/60,000-mile powertrain warranty apply.
Priority
Schedule a dealer visit within a week. The repair is free under warranty, and addressing rich running on a V8 Tahoe used for family transport and towing ensures the catalytic converters stay healthy. Converter replacement on the Tahoe V8 can exceed $3,000.