P0174 Chevrolet Trax
System Too Lean (Bank 2) · Powertrain Code · High · Repair: Moderate
What is P0174?
The engine is running lean on bank 2. Same causes as P0171 but affecting the opposite cylinder bank on V-engines.
When the Chevrolet Trax triggers code P0174 (system too lean (bank 2)), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Chevrolet Trax.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Chevrolet Trax.
Common Causes on Chevrolet Trax
- Intake air leak at turbo charge pipe connection on 1.2T or 1.3T
- Failing PCV valve integrated into valve cover
- Mass airflow sensor contamination
- Vacuum leak at brake booster check valve
- Fuel injector carbon buildup from direct injection
Symptoms
- Rough idle especially when cold
- Hesitation or stumble on acceleration
- Engine surging at steady throttle
- Lean misfire under load
- Poor fuel economy
- Check engine light illuminated
Notes for Chevrolet Trax
P0174 is uncommon on 4-cylinder engines as they only have one bank. Trax and Encore GX use inline engines where only P0171 would apply.