marcopono

Got Reduced Power Warning. Pulled codes: P0106, P0108, P0641. Changed MAP sensor. Now I get only P0641 and Engine Disabled. Any help would be greatly appreciated by me and wife as it's her ride. THX, ted

whopper

A quick search for p0641 using the SEARCH Tool at the top of the page shows a couple posts pointing to a bad front hub's speed sensor. Check your connections at the hubs before replacing them.

Oldblue

P0106, check your MAP sensor connection , I know you just changed it, per



http://www.obd-codes.com/p0106

P0108. Check your MAF sensor, it could be dirty or if you've just had the air filter housing off it might just be disconnected.

http://www.obd-codes.com/p0108

These might also be a result of a loose ground wire or ECM wiring harness connection

P0641, it might be a loose ground wire, loose under hood fuse box halves are loose, loose sensor connections per

http://www.autocodes.com/p0641_chevrolet.html

And

https://www.chevyhhr.net/forums/prob...m-54094/page2/

Considering the age of your HHR , it just might be the battery is starting to give up! Perhaps have your battery and charging system tested

donbrew

P0641 means that one of the two 5-volt ref busses is sending either higher or lower than 5V. A faulty 5V ref will cause whatever sensors are on that buss to give faulty readings (cause a code).

Dead battery or dead ECM or dead fuse or chafed wire are good suspects.

Before you spend money have the battery checked and search for a chafed wire, especially the wires going to the MAP and the MAF. And look at all your fuses, there are 2 fuse boxes, look in your Owner Manual for locations (link in my sig).

Is the engine disabled?

I don't know what pair of glasses whopper had on.

firemangeorge

quote: "I don't know what pair of glasses whopper had on. "

I was thinking the same thing Don.

whopper

ie: https://www.chevyhhr.net/forums/prob...r-p0641-48650/

donbrew

H'mmm, that is an oddity. Maybe that was the 5V ref in question. Except that the wheel speed sensors only use "low ref", known to us infidels as ground, and signal.

Oldblue

George did you read my suggestions in post 3?

donbrew

He said he changed the MAP and all of the other codes cleared. I'm not sure if P0641 will clear itself immediately or if it needs 50 drive cycles.

marcopono

Well after posting I decided I would scan and erase it one more time. I did and finally the light went off it is running fine. I had erased it like 3 times before this with scanner but when I restarted it would still be there. Strange! Anyhow, man u guys are great with the help. I learned a lot and will check these things if it comes back. God bless you helpers. ted