P0175 on the 2020 Chevrolet Traverse
A P0175 code on your 2020 Traverse means the ECM has detected a rich condition on Bank 2. The 2020 Traverse uses the 3.6L V6 (LFY) producing 310 horsepower, paired with a nine-speed automatic transmission. This naturally aspirated V6 uses direct injection only. Bank 2 is the cylinder bank opposite from cylinder one. With 40,000-70,000 miles on a 2020 model, both contamination and early wear are possible causes.
The 3.6L V6 and Direct Injection
GM's 3.6L V6 is a workhorse engine found across many vehicles. It uses high-pressure direct injection without port injection assistance. This means carbon buildup on intake valves is a known issue at higher mileages. The fuel system relies on precise injector operation and accurate sensor feedback to maintain proper air-fuel ratios across both banks.
Symptoms
- Check engine light illuminated
- Fuel economy below the rated 18 city / 27 highway MPG
- Rough V6 idle
- Dark exhaust emissions
- Reduced acceleration response
- Fuel smell from exhaust
- May fail emissions testing
Common Causes
1. Bank 2 O2 Sensor Wear
At 40,000-70,000 miles, the upstream O2 sensor on Bank 2 can begin degrading. The 3.6L V6 runs at relatively high exhaust temperatures, especially during highway driving and climbing grades with a full family load. A worn sensor provides inaccurate feedback, causing the ECM to over-fuel Bank 2.
2. MAF Sensor Contamination
The Traverse is a family hauler that operates in varied environments. The MAF sensor accumulates PCV system residue and environmental dust over time. Cleaning with MAF-specific spray is the cheapest diagnostic step. Many P0175 codes on the 3.6L V6 resolve with MAF cleaning alone.
3. Direct Injector Carbon Buildup
By 50,000+ miles, the direct injectors on the 3.6L can develop carbon deposits that alter spray patterns and prevent proper sealing. Carbon on the back of intake valves also restricts airflow, particularly on the Bank 2 side. A fuel system cleaning treatment is a good first step, with professional walnut blasting for severe cases.
4. EVAP Purge Valve Issue
A purge valve stuck open on the Traverse allows continuous fuel vapor flow from the charcoal canister into the intake. This adds unmetered fuel to the mixture, causing a rich condition. The purge valve on the 3.6L is accessible and affordable to replace.
Diagnostic Procedure
- Scan for all codes and check for EVAP or misfire companion codes
- Monitor Bank 1 and Bank 2 fuel trims at idle and 2,500 RPM
- Clean the MAF sensor as the first step
- Test the Bank 2 upstream O2 sensor with live data
- Check the EVAP purge valve operation using a scan tool
- Perform injector balance test on Bank 2
- Verify fuel pressure at the rail
Repair Costs
O2 sensor: $130-$310. MAF cleaning: under $15. Injector cleaning: $100-$200. Injector replacement: $200-$550. EVAP purge valve: $80-$200. The 2020 Traverse's 5-year/60,000-mile powertrain warranty runs through 2025. Check your mileage for coverage.
Priority
Address within two to three weeks. The Traverse is a family vehicle, and fuel economy matters for the daily commute and road trips. The catalytic converters on the 3.6L V6 are expensive to replace, so protecting them by fixing P0175 is a smart move.