P0174 Jeep Wrangler
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 Jeep Wrangler 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 Jeep Wrangler.
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 Jeep Wrangler.
Common Causes on Jeep Wrangler
- Intake manifold gasket leak on bank 2 of 3.6L Pentastar V6
- Cracked vacuum hose from off-road vibration on passenger side
- PCV valve failure causing unmetered air entry
- Bank 2 fuel injector carbon deposits from short trip driving
- Exhaust manifold gasket leak on bank 2 from thermal cycling
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 Jeep Wrangler
Wrangler and Gladiator 3.6L V6 engines experience more vacuum hose failures due to off-road vibration. The 2.0T inline-4 will not set P0174.