P0174 Chevrolet Malibu
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 Malibu 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 Malibu.
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 Malibu.
Common Causes on Chevrolet Malibu
- Cracked intake manifold on 1.5T engine causing vacuum leak
- PCV valve diaphragm failure in valve cover
- Mass airflow sensor contamination from aftermarket air filter
- Vacuum hose deterioration at throttle body
- Fuel injector deposits reducing flow
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 Malibu
P0174 is uncommon on 4-cylinder Malibu models as they only have one bank. If present on a 1.5T, check for intake manifold cracking which is a known GM issue.