What Does P0174 Mean on Your 2023 Chevrolet Tahoe?
When your 2023 Chevrolet Tahoe sets a P0174 trouble code, the engine control module (ECM) has detected a lean air-fuel mixture on Bank 2. There is too much air or not enough fuel on that cylinder bank. The 2023 Tahoe offers a 5.3-liter V8 producing 355 horsepower, a 6.2-liter V8 making 420 hp, or a 3.0-liter Duramax turbo-diesel inline-six. On the V8 models, Bank 2 is a separate cylinder bank, making P0174 a targeted indicator of a bank-specific fuel system issue.
Your 2023 Tahoe should still be under the GM factory warranty, so most repairs related to P0174 should be covered. Still, understanding the issue helps you communicate effectively with the service advisor.
Common Symptoms You May Notice
- Check engine light on
- Rough or unsteady idle
- Reduced power during acceleration or towing
- Worse fuel economy
- Engine hesitation
- Occasional misfires or vibration
Most Likely Causes of P0174 on the 2023 Tahoe
- Vacuum Leak on Bank 2 - A loose or cracked vacuum hose, leaking intake manifold gasket, or failed PCV valve on the Bank 2 side can introduce unmetered air into the engine.
- Dirty MAF Sensor - Contamination on the mass airflow sensor causes incorrect air measurement, resulting in insufficient fuel delivery from the ECM.
- Faulty Bank 2 O2 Sensor - A malfunctioning upstream oxygen sensor on Bank 2 can send incorrect exhaust gas data to the ECM.
- Fuel Pressure Issue - A fuel pump losing pressure or a failing fuel pressure regulator can starve the engine of fuel during operation.
How to Diagnose the Problem
- Read all codes - Confirm P0174 and check for additional codes on Bank 1 or misfire codes.
- Check fuel trims - Monitor STFT and LTFT on both banks. Bank 2 LTFT above 10 percent confirms the lean condition.
- Inspect vacuum system - Check all hoses, connections, and gaskets on the Bank 2 side.
- Clean the MAF sensor - Quick and inexpensive first diagnostic step.
- Test fuel pressure - Verify pressure matches GM specifications for the V8 engine.
Repair Options and Cost Breakdown
Check your warranty status first. The 2023 Tahoe should still be under GM's bumper-to-bumper warranty.
- Warranty repair - $0 if covered.
- Vacuum hose repair - $10 to $50 for parts.
- MAF sensor cleaning - $8 to $15.
- MAF sensor replacement - $120 to $250, plus $60 to $120 labor.
- O2 sensor replacement - $120 to $300, plus $100 to $200 labor.
- Fuel pump replacement - $350 to $600, plus $250 to $450 labor.
Can You Fix This Yourself?
Basic tasks like MAF sensor cleaning and vacuum hose inspection are easy. However, since your 2023 Tahoe is likely under warranty, let the dealer handle it for free. The Tahoe's spacious engine bay makes DIY work easier when the warranty expires, but for now, take advantage of the coverage you paid for.
Prevention Tips
- Replace the air filter at recommended intervals
- Use top-tier gasoline
- Inspect vacuum hoses during routine oil changes
- Follow the GM maintenance schedule
- Keep up with dealer service appointments for any software updates