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Hi, I have a 2007 G6 GT hardtop convertible 3.9L. I’m having a weird issue. Occasionally, my service traction light will come on and is followed by a strange noise. It sounds like some sort of vacuum leak, and I can’t quite pin down where it’s coming from in the engine bay as it is pretty high pitched. It will then throw codes P0171 and P0174 engine lean codes. Then, when engine RPM increases when driving for example, the noise stops and the traction codes go away. Traction control and ABS also both work perfectly fine when the codes aren’t on. I tested both on gravel. I have tried new MAF sensors, and I’ve checked for intake air leaks, and nothing has made sense yet! I’m avoiding taking it in somewhere as I can almost always do the maintenance myself, but I’m pretty stumped on this one! As far as I know, traction and ABS aren’t vacuum based systems on the g6, right? Any input would be greatly appreciated!
 

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I don't know if this will help, but I cut and pasted the text below from the service manual program that gives diagnostic suggestions for the two codes you referenced. Maybe something here will lead you to where the problem is. Good luck - Mark

Pasted test appears below...
---------------------------------------------------------------
P0171, P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected 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 .

• With the engine idling and the transmission in the Park or Neutral position, observe the MAP sensor parameter. The MAP sensor parameter should be between 19-42 kPa.

⇒ If the MAP sensor is not between 19-42 kPa at idle, refer to DTC P0106 .

• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be between 3-10 g/s at idle.

⇒ If the MAF sensor parameter is not between 3-10 g/s at idle, refer to DTC P0101 or P1101 or DTC P0102 or P0103 .

• Vacuum hoses for splits, kinks, and improper connections

• Insufficient fuel in the tank

• Low fuel pressure

• Fuel contamination

• Ethanol concentration greater than 15 percent

• Malfunctioning 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

• A cracked EVAP canister

• Evaporative pipes obstructed or leaking

• The crankcase ventilation system for leaks

• The HO2S for improper 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

Repair or replace as necessary.
 

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Also worth noting for DTC P0174 as "Fuel Trim System Lean Bank 2"
Important: Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.
 

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Hi, I have a 2007 G6 GT hardtop convertible 3.9L. I’m having a weird issue. Occasionally, my service traction light will come on and is followed by a strange noise. It sounds like some sort of vacuum leak, and I can’t quite pin down where it’s coming from in the engine bay as it is pretty high pitched. It will then throw codes P0171 and P0174 engine lean codes. Then, when engine RPM increases when driving for example, the noise stops and the traction codes go away. Traction control and ABS also both work perfectly fine when the codes aren’t on. I tested both on gravel. I have tried new MAF sensors, and I’ve checked for intake air leaks, and nothing has made sense yet! I’m avoiding taking it in somewhere as I can almost always do the maintenance myself, but I’m pretty stumped on this one! As far as I know, traction and ABS aren’t vacuum based systems on the g6, right? Any input would be greatly appreciated!
I am having the same problem. 07 G6
 
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