P0175 on the 2021 Kia Telluride V6
The 2021 Kia Telluride is powered by the Lambda II 3.8L GDI V6 producing 291 hp and 262 lb-ft of torque, paired with an 8-speed automatic transmission. This engine uses gasoline direct injection with dual CVVT (Continuously Variable Valve Timing). Bank 2 on the Lambda II V6 is the rear cylinder bank (closest to the firewall). P0175 means the ECM detects persistent over-fueling on this bank.
Symptoms
- Check engine light on
- Fuel economy below the rated 20-26 MPG
- Rough idle or vibration
- Black exhaust smoke during acceleration
- Reduced power when fully loaded with passengers
- Fuel odor from exhaust area
Top Causes on the 3.8L GDI V6
1. GDI Carbon Buildup on Intake Valves (High Likelihood)
At 40,000-70,000 miles typical for 2021 Tellurides, the Lambda II 3.8L GDI has accumulated significant carbon on the intake valves. This engine shares its architecture with the Hyundai Palisade and Genesis GV80, and carbon buildup is well-documented across all applications. The Telluride's role as a family hauler means lots of short trips (school, errands, weekend activities) that accelerate carbon accumulation. Carbon deposits disrupt airflow and combustion, directly contributing to fuel trim imbalances on Bank 2.
2. Contaminated MAF Sensor (High Likelihood)
The 3.8L V6 draws substantial air volume through the MAF sensor. Years of PCV oil vapor and environmental contaminants coat the hot-wire element. The Telluride's large air intake is positioned low and can ingest more road debris and moisture than higher-mounted intakes. MAF cleaning is the cheapest first diagnostic step and resolves P0175 in many cases.
3. Bank 2 Upstream O2 Sensor Degradation (Medium Likelihood)
The Bank 2 upstream O2 sensor sits in the rear exhaust manifold, where it receives less cooling airflow. At 40,000-70,000 miles, the sensor may be showing early degradation, particularly if the Telluride has been used for towing (up to 5,000 lbs). Higher exhaust temperatures during towing accelerate sensor aging. Graph sensor response with a scan tool to evaluate.
4. GDI Injector Carbon Fouling (Medium Likelihood)
Direct injectors on Bank 2 (rear cylinders) operate inside the combustion chamber at high pressures. Carbon around the injector tips affects spray patterns and sealing. Combined with intake valve carbon, this creates compounding fuel mixture issues. Professional injector cleaning or replacement may be needed alongside walnut blast carbon cleaning.
V6 Bank-Specific Diagnosis
When P0175 appears alone (without P0172 for Bank 1), the issue is isolated to the rear bank. This helps narrow the diagnosis to Bank 2-specific components. If both codes appear, the cause is system-wide (MAF, fuel pressure, or intake air).
Diagnostic Steps
- Scan all codes. Check for P0172 to determine bank-specific vs. system-wide issue.
- Check recall and TSB status for the Lambda II 3.8L.
- Monitor Bank 2 fuel trims. LTFT below -10% confirms enrichment.
- Clean MAF sensor first.
- Test Bank 2 O2 sensor response time.
- Borescope Bank 2 intake valves for carbon assessment.
Repair Costs
MAF cleaning: $10-$15. MAF replacement: $130-$290. O2 sensor: $170-$350. Carbon cleaning (walnut blast) for V6: $500-$800. GDI injector replacement: $250-$450 each. Diagnostic time: $100-$160/hour.