2005 Grand Prix Trouble codes P0641...

[Amy91503]

Good Morning Guys and Gals...

Hoping you all could help me out. A friend of mine has a 2005 Grandprix 3800...stock with no mods.

The car is stalling out intermittenly after he took it to wally world for an oil change and a Air Filter change.

I hooked up my Scan Gauge to see if I could pull a code or two and got a P0641, P0068(Throttle body Airflow Performance), P0108( MAP Sensor Circuit High Voltage) I cleared them and the P0641 came back immediatly.(PCM Voltage out of tolerance on the 5 volt reerence circuit) I was thinking the MAF sensor was knocked loose or possible a vaccuum line? I am no mechanic... but can trouble shoot the simple things in life.

I couldn't find a schematic on the engine... looking for a place to start. Any help would be appreciated. I've been looking at import engines for too long and I'm really not sure what I am looking for on this engine.

Is it possible while they were changing out the air filter they pulled the one of the sensors? Maybe a ground wire? Seems like a voltage problem possibly?

The Map, MAF and the PCM.... Perhaps the MAF is dirty or seated incorrectly... just can't figure out where to start with this.

Any PDF's out there on this engine to show me where everything is located?

Lots of questions...sorry!

Thanks in advance for the help!!!!

Amy

[tblake]

Hi Amy, Welcome to AF. Bring that car right back to Wally World and insist that they fix it. (what I would do)

But if you still feel like diagnosing this yourself, check you Private Messages.

[ThomasJ2895]

Was wondering what the failure was found to be...sounds like I have the same kind of problem...going to check the codes now...just found out that the nimrods in the California state govt outlawed the free use/loan of code readers by car parts outfits to customers. What a great State!

[BNaylor]

Originally Posted by ThomasJ2895

Was wondering what the failure was found to be...sounds like I have the same kind of problem...going to check the codes now...just found out that the nimrods in the California state govt outlawed the free use/loan of code readers by car parts outfits to customers. What a great State!

I'm glad I don't live in California. Those green weenie states are getting ridiculous.

Regardless, you can still purchase your own odb-ii scanner.