Originally Posted by Lefty300
I have a 3.9L V6 engine...
The traction control lamp will go out after you resolve the p0174 code. The EBCM shut off the traction control system in response to that code popping.
So pretty much all I know about your car is that you have an over-lean condition in bank 2. Either you have too much air or not enough fuel in bank 2. Since you don't have any other codes set, an intake air leak past the MAF & affects only bank 2 is a prime suspect. But there are many other possibilities. I suspect you will need help sorting it.
Circuit/System Testing For DTC P0174
• Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be less than approximately 19.5 percent with the engine running at operating temperature.
• If the value is not less than 19.5 percent, inspect for the following:
- With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure .
⇒ If the MAP sensor does not indicate the correct barometric pressure, refer to DTC P0106, P0107, or P0108 .
- With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 3-10 g/s at idle.
⇒ If the MAF sensor parameter is not within 3-10 g/s at idle, refer to DTC P0101 or P1101 or DTC P0102 or P0103 .
- Vacuum hoses for splits, kinks, and proper connections
- Sufficient fuel in the tank
- Low fuel pressure
- Fuel contamination
- Properly functioning fuel injectors
- Missing, loose, or leaking exhaust components from the HO2S forward
- Vacuum leaks at the intake manifold, the throttle body, the brake booster hose, and the injector O-rings
- The air induction system and the air intake ducts for leaks or for a missing air filter element
- Evaporative canister purge lines plugged or obstructed
- The crankcase ventilation system for leaks
- The HO2S for proper installation and for electrical wires or connectors that may have contacted the exhaust system
- The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
- The HO2S sensor 1 low signal circuit for an open circuit or high resistance
- Malfunctioning engine components
Here's more info: