What Does P0172 Mean on Your 2023 Kia Telluride?
When your 2023 Kia Telluride sets a P0172 code, the engine control module has detected that Bank 1 of your 3.8-liter Lambda II V6 is running too rich. This engine produces 291 horsepower with multi-port injection. Bank 1 is the side of the V6 containing cylinder number 1. The ECM uses oxygen sensor feedback to control the air-fuel ratio, and when fuel trim corrections exceed normal limits on Bank 1, this code is triggered.
Symptoms You Might Notice
- Check engine light on
- Fuel economy below the rated 23 mpg combined
- Black exhaust smoke
- Rough or uneven idle
- Sluggish acceleration
- Fuel odor from the exhaust
Common Causes of P0172 on the 2023 Telluride
- Contaminated MAF Sensor — Even on a newer vehicle, the mass airflow sensor can get dirty from road conditions, causing incorrect readings and over-fueling.
- EVAP Purge Valve Stuck Open — A documented Kia issue. The purge valve fails open, continuously allowing fuel vapors into the intake manifold.
- Defective Bank 1 Oxygen Sensor — A prematurely failing or factory-defective O2 sensor provides incorrect feedback to the ECM.
- ECM Software Update — Software calibration updates may address fuel trim behavior on the Lambda II engine.
How to Diagnose the Problem
- Visit your Kia dealer — The 2023 Telluride is under full warranty. Your dealer will diagnose at no cost and check for TSBs.
- Check both banks — If P0175 is also present, the cause is system-wide like the MAF or purge valve.
- Monitor fuel trims — Bank 1 LTFT below -10% confirms the rich condition.
- Inspect the MAF sensor — At idle, the 3.8L V6 should read about 6-12 g/s.
- Test O2 sensors — Check for proper switching on the Bank 1 upstream sensor.
Repair Options and Estimated Costs
- ECM software update — $0 under warranty
- MAF sensor cleaning or replacement — $10-$290 ($0 under warranty)
- EVAP purge valve replacement — $85-$220 ($0 under warranty)
- Oxygen sensor replacement — $175-$365 ($0 under warranty)
- Fuel injector service — $250-$560 ($0 under warranty)
All repairs should be covered under Kia's factory warranty. Take it to the dealer for a free diagnosis and repair.
Prevention Tips
- Follow the Kia maintenance schedule
- Don't overfill the gas tank
- Use quality Top Tier fuel
- Report check engine lights to your dealer promptly
- Keep the air filter clean