What Does P0174 Mean on Your 2020 Chevrolet Camaro?
A P0174 diagnostic trouble code on your 2020 Chevrolet Camaro indicates the ECM has detected a lean air-fuel mixture on Bank 2. The 2020 Camaro is available with several engines: a 2.0-liter turbocharged four-cylinder making 275 hp, a 3.6-liter V6 producing 335 hp, a 6.2-liter V8 making 455 hp in the SS, or the supercharged 6.2-liter V8 producing 650 hp in the ZL1. On the V6 and V8 models, Bank 2 is a distinct cylinder bank. On the 2.0T, a P0174 may relate to sensor mapping since it is an inline four-cylinder.
In a performance vehicle like the Camaro, a lean condition is particularly concerning because these engines are designed to operate at higher power levels. Running lean under hard acceleration or track driving can cause serious engine damage.
Common Symptoms You May Notice
- Check engine light on
- Rough idle
- Hesitation or flat spots during acceleration
- Reduced power output
- Poor fuel economy
- Engine knock or ping under hard acceleration
Most Likely Causes of P0174 on the 2020 Camaro
- Vacuum Leak on Bank 2 - A cracked vacuum hose, leaking intake manifold gasket, or failed PCV connection can introduce unmetered air on the Bank 2 side.
- Dirty MAF Sensor - High-performance air intake systems and oiled aftermarket filters are popular Camaro modifications that can contaminate the MAF sensor.
- Failing Bank 2 O2 Sensor - The upstream O2 sensor on Bank 2 can degrade and cause the ECM to lean out the mixture.
- Fuel Delivery Issue - On higher-horsepower models, fuel demand is significant. A weak pump, clogged filter, or dirty injectors can cause a lean condition under load.
How to Diagnose the Problem
- Scan all codes - Confirm P0174 and check for P0171, misfire codes, or knock sensor codes.
- Monitor fuel trims - Check LTFT on both banks. High positive values on Bank 2 only confirm a bank-specific issue.
- Check for vacuum leaks - Inspect Bank 2 hoses and intake gasket area. Smoke testing is most effective.
- Inspect the MAF sensor - If you have an aftermarket intake or oiled filter, the MAF may be contaminated.
- Test fuel pressure - Critical on the V8 models, which require high fuel flow rates.
Repair Options and Cost Breakdown
Performance car parts can be more expensive, especially for the SS and ZL1 models.
- Vacuum hose replacement - $10 to $50.
- Intake manifold gasket - $100 to $250, plus $250 to $500 labor (V8).
- MAF sensor cleaning - $8 to $15.
- MAF sensor replacement - $120 to $280, plus $60 to $120 labor.
- O2 sensor replacement - $120 to $300, plus $100 to $200 labor.
- Fuel pump replacement - $350 to $650, plus $250 to $450 labor.
Can You Fix This Yourself?
The Camaro community is highly active with DIY resources. MAF sensor cleaning and vacuum hose replacement are quick jobs. Sensor replacement is straightforward with basic tools. Intake manifold gasket work on the V8 is more involved but well-documented. If you have performance modifications, make sure they are properly tuned and not contributing to the lean condition.
Prevention Tips
- If using an aftermarket intake, ensure the MAF sensor housing is properly sized
- Avoid oiled air filters that can contaminate the MAF sensor
- Use quality fuel, preferably premium as recommended for V8 models
- Inspect vacuum connections after any engine bay work
- Follow the GM maintenance schedule for spark plugs and filters