P0174 RAM 1500
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 RAM 1500 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 RAM 1500.
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 RAM 1500.
Common Causes on RAM 1500
- Intake manifold gasket leak on bank 2 of 5.7L HEMI
- Cracked vacuum hose on passenger side of HEMI V8
- Bank 2 fuel injector failure or MDS solenoid issue
- PCV valve stuck open on passenger valve cover
- Exhaust manifold bolt failure causing leak on bank 2
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 RAM 1500
Ram 1500 HEMI engines are notorious for broken exhaust manifold bolts on bank 2 which cause false lean readings. Always check for exhaust tick noise.