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"reduced Engine Power" Warning!

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bsites9 Enthusiast

bsites9

Posted
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Hey everybody. Have a question for you guys. I have a 2006 GMC Sierra 1500 Crew cab 4.8L 70K.

 

Last night, drove to the Food Lion. Upon leaving the store, I start the truck and get "Reduced Engine Power" warning, and the truck is sputtering really bad. So I turn the truck off, wait a minute, then re-start. And everything is fine at that point. No problems on the ride home, and no problems today driving to work.

 

Just curious who has experienced this warning, and who has a little knowledge about it. i'm going to get the codes pulled in just a little while, and I'll post those up. Thanks a lot.

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

Rewire the tac motor circuits from the tac module to the throttle body using new terminals on both ends of all of the circuits. Common issue.

bsites9 Enthusiast

bsites9

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  • Author
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Rewire the tac motor circuits from the tac module to the throttle body using new terminals on both ends of all of the circuits. Common issue.

 

 

thanks for the response, though I really have no idea about what you said. I wasn't aware that this was a common issue, especially since I've been selling GM products for the last 6 years...I don't think I've ever had a customer ask me about it. I did get the codes pulled.

 

P0443- evap code

p1516 - undefined

p2108 - undefined

u0107 - undefined

 

The evap code I've known about for a while. Replaced the evap purge solenoid about a year ago, and that took care of the problem for about a whole week, then the light came back on again, and keeps coming on and going off. But the truck runs fine either way. I'm concerned about this new issue. Though it didn't do it anymore yesterday, or this morning.

bsites9 Enthusiast

bsites9

Posted
  • Author
Posted
Rewire the tac motor circuits from the tac module to the throttle body using new terminals on both ends of all of the circuits. Common issue.

 

 

thanks for the response, though I really have no idea about what you said. I wasn't aware that this was a common issue, especially since I've been selling GM products for the last 6 years...I don't think I've ever had a customer ask me about it. I did get the codes pulled.

 

P0443- evap code

p1516 - undefined

p2108 - undefined

u0107 - undefined

 

The evap code I've known about for a while. Replaced the evap purge solenoid about a year ago, and that took care of the problem for about a whole week, then the light came back on again, and keeps coming on and going off. But the truck runs fine either way. I'm concerned about this new issue. Though it didn't do it anymore yesterday, or this morning.

 

 

 

ttt

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted
thanks for the response, though I really have no idea about what you said. I wasn't aware that this was a common issue, especially since I've been selling GM products for the last 6 years...I don't think I've ever had a customer ask me about it. I did get the codes pulled.

 

P0443- evap code

p1516 - undefined

p2108 - undefined

u0107 - undefined

 

The evap code I've known about for a while. Replaced the evap purge solenoid about a year ago, and that took care of the problem for about a whole week, then the light came back on again, and keeps coming on and going off. But the truck runs fine either way. I'm concerned about this new issue. Though it didn't do it anymore yesterday, or this morning.

TAC motor = the motor that opens and shuts your throttle blade on the intake.

TAC module = the module that controls the TAC motor.

 

By the looks of your code scanner, I'd say you might want a GM trained tech to look at it. If you've been selling vehicles, GM or whoever, I doubt you would hear anything about this as it is something that most people talk to service about instead of sales but I digress.

 

Multiple bulletins and known repairs out there, even a reprogram of the pcm. Replacing the wiring and terminals for the system is the most common or it could just be that the throttle body needs a good cleaning and the idle reset. Either way, unless you have the GM tools to do so, you won't be able to repair it properly yourself anyway. Sorry that sounds bad but its the truth. The two "P" codes you have there are both for the TAC motor failing in its performance testing and the U0107 is the pcm not seeing communication with the TAC module, btw. Again, most likely all fixed with wiring replacement, in my experiance.

SouthCo Senior Enthusiast

SouthCo

Posted
Posted

Had same issue in my 03 Tahoe and it was the throttle position sensor which required the throttle body to be replaced as they are one unit. But my tahoe has the 5.3 so might be something different on yours.

bsites9 Enthusiast

bsites9

Posted
  • Author
Posted
Had same issue in my 03 Tahoe and it was the throttle position sensor which required the throttle body to be replaced as they are one unit. But my tahoe has the 5.3 so might be something different on yours.

 

 

Ok guys, thanks for the replies. I did find a TSB that listed those exact codes that mentioned the throttle body. I'll have them check it out as soon as I can. Maybe it will never do it again, who knows.

bsites9 Enthusiast

bsites9

Posted
  • Author
Posted
thanks for the response, though I really have no idea about what you said. I wasn't aware that this was a common issue, especially since I've been selling GM products for the last 6 years...I don't think I've ever had a customer ask me about it. I did get the codes pulled.

 

P0443- evap code

p1516 - undefined

p2108 - undefined

u0107 - undefined

 

The evap code I've known about for a while. Replaced the evap purge solenoid about a year ago, and that took care of the problem for about a whole week, then the light came back on again, and keeps coming on and going off. But the truck runs fine either way. I'm concerned about this new issue. Though it didn't do it anymore yesterday, or this morning.

TAC motor = the motor that opens and shuts your throttle blade on the intake.

TAC module = the module that controls the TAC motor.

 

By the looks of your code scanner, I'd say you might want a GM trained tech to look at it. If you've been selling vehicles, GM or whoever, I doubt you would hear anything about this as it is something that most people talk to service about instead of sales but I digress.

 

Multiple bulletins and known repairs out there, even a reprogram of the pcm. Replacing the wiring and terminals for the system is the most common or it could just be that the throttle body needs a good cleaning and the idle reset. Either way, unless you have the GM tools to do so, you won't be able to repair it properly yourself anyway. Sorry that sounds bad but its the truth. The two "P" codes you have there are both for the TAC motor failing in its performance testing and the U0107 is the pcm not seeing communication with the TAC module, btw. Again, most likely all fixed with wiring replacement, in my experiance.

 

 

thanks for the response. I'll get it checked out. But trust me, I would have definately heard about it if any of my customers had this issue...I have to hear about every tiny little detail it seems like.. :cheers:

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