What Does P0174 Mean on Your 2020 Chevrolet Traverse?
A P0174 code on your 2020 Chevrolet Traverse indicates the engine control module (ECM) has detected a lean air-fuel mixture on Bank 2. The engine is receiving too much air relative to fuel on that cylinder bank. The 2020 Traverse is powered by a 3.6-liter V6 engine producing 310 horsepower and 266 lb-ft of torque. With a V6 configuration, Bank 2 is a distinct set of cylinders, and P0174 points to a lean condition specifically on that side.
The Traverse is a family-oriented three-row SUV. A lean condition can cause rough running, reduced performance, and increased emissions. Getting this sorted out promptly ensures smooth, reliable transportation for your family.
Common Symptoms You May Notice
- Check engine light on
- Rough or unsteady idle
- Hesitation during acceleration
- Reduced fuel economy
- Engine vibration at idle
- Occasional misfires
Most Likely Causes of P0174 on the 2020 Traverse
- Vacuum Leak on Bank 2 - The GM 3.6L V6 is known for intake manifold gasket issues and vacuum hose deterioration. A leak on the Bank 2 side allows unmetered air into the engine.
- Dirty MAF Sensor - A contaminated mass airflow sensor underreports air volume, causing the ECM to deliver insufficient fuel.
- Failing Bank 2 O2 Sensor - The upstream oxygen sensor on Bank 2 can degrade over time and provide inaccurate exhaust gas readings to the ECM.
- Low Fuel Pressure - A weakening fuel pump or clogged fuel filter can starve the engine of fuel, creating a lean condition under varying load conditions.
How to Diagnose the Problem
- Scan for codes - Confirm P0174 and check for P0171 or misfire codes.
- Monitor fuel trims - LTFT above 10 percent on Bank 2 confirms the lean condition.
- Inspect for vacuum leaks - Focus on Bank 2 side hoses, intake manifold gaskets, and PCV connections.
- Clean the MAF sensor - Quick and cheap first diagnostic step.
- Test fuel pressure - The 3.6L V6 should maintain about 50 to 58 psi at idle.
Repair Options and Cost Breakdown
- Vacuum hose replacement - $10 to $40. Easy DIY.
- Intake manifold gasket - $80 to $180 for gaskets, plus $250 to $450 in labor.
- MAF sensor cleaning - $8 to $15.
- MAF sensor replacement - $100 to $220, plus $50 to $100 labor.
- O2 sensor replacement - $100 to $260, plus $80 to $160 labor.
- Fuel pump replacement - $300 to $500, plus $200 to $400 labor.
Can You Fix This Yourself?
MAF sensor cleaning, vacuum hose replacement, and O2 sensor swaps are manageable DIY tasks on the Traverse. The 3.6L V6 engine bay offers decent access to most components. Intake manifold gasket replacement is a moderate project requiring several hours. Fuel pump replacement requires dropping the tank, which is a more involved job but doable with the right tools.
Prevention Tips
- Replace the air filter every 15,000 to 20,000 miles
- Use top-tier fuel to minimize carbon deposits
- Inspect vacuum hoses and connections during oil changes
- Follow the GM maintenance schedule
- Consider a fuel system cleaning every 30,000 miles