I have a 2008 Tahoe Hybrid that stalls on me while going down the road. Have taken to dealership a couple times & they have been no help. The check engine light comes on afterwards. The codes are: P0420; P0446; P0573; & P0AC4. Any help would be greatly appreciated!!

 

Can you describe your stalling a bit in more detail?

 

As I'm going down the road, mostly low speeds, vehicle just stalls out. After it sits a while it'll start back up. Sorry I don't have much more info than that.

 

I haven't experienced any of those issues, so I won't be any help. However, there are a lot of smart people here who probably can. Good luck with finding an answer!

 

Thx bro

 

Here is a document that has the codes for the GM Hybrid - posted by someone else on the forums - maybe this will help. It looks like your codes are emission-related.

 

P0420 is a failing cat. If this is a result of clogging, it can rob power and contribute to stalls. Apart from that, I don't have anything.

 

Thx fellas!! Gonna have the catalytic converters and o2 sensors replaced. I'll keep yall posted.

 

 

DONT replace the Catalytic converter yet Deal with the other codes as the P0420 code can come on along with those other code as well as long as it's heating up to like 360C(typical for me) to 600C it's good (over that it may be misfiring or dumping fuel into the cat)


check the ground wire in the rear of the SUV.... on the driver side right under the bumper also another one mid chassis
chances are it's damaged or has corrosion .. or high impedance or open connection

check inside where the Tire pump storage i think there is a ground wire in there as well

I'm going to clean mine up as i'm having issues with the back up sensors sometimes it works(if it's too hot it does not work correctly)




As far as the stall most likely your getting P061B
check the spark plugs one of mine was fried replaced them no more stallout aka P061B (P0AC4 typical stall out includes P061B)