98 Bravada Several questions and Promblems

I have several questions about codes that are tripping my check engine light. So if any one knows whats wrong and how to fix it I would appreciate it.

First code is B0408

Second code is C0222

Third I have a humming sound coming from the back end to the vech. (I believe it my be a fuel pump going bad.)

Fourth How can I tell if the rear end is going bad or if I'm just getting rear axle role do to weak leaf springs?

Any help would be greatly appreciated. Thanks

On the fuel pump hum check fuel filter and fuel pressure.
The codes are starnge numbers.
What kind of scanner are you using?
Have you cleared codes and see if it returns?
Here is a code chart.
But I do not see your codes listed.
http://www.troublecodes.net/OBD2/

What is the rear end doing?
http://www.differentials.com/install.html

Any engine running problems or anything else acting up?

DTC B0408 Temperature Control #1 (Main/Front) Circuit Malfunction

DTC C0222 RF Wheel Speed Signal Missing

http://www.regalgs.org/obd2.htm

Not sure about the scanner the guy that reprogrammed my ecu told me the codes were in there.

Temperature Control makes sense I have been having problems with that. Anyone know how to fix.

The humming sound (I believe to be the fuel pump) continues to make the noise even after I turn the vech. off, but it only does it for a few seconds.

No other engine problems just had it rebuilt.

There is a small vibration or shimmy if I take off while on a hill or incline. Doesn't do it all the time though.

On tempt control?
Auto matic or manual AC/heater controls?
What is it doing or not doing?

On fuel pump check fuel filter and run a fuel pressure test on it.
It is normal for a fuel pump to run a couple of seconds after key off also you should hear it prime up key on.

How was ECM reprogramed or what kind of scanner was used to check and reprogram it?
Was codes cleared and have they returned?

I have the automatic temp control unit. It seems to always blow hot air even when it is turned off. It also sounds like something it grinding behind the controls. I have already replaced the blend door controller.


Again I'm not sure what he used to reprograme the computer. He had a laptop. It was well worth the money though. Runs a 100% better and picked up 3 miles a gallon.


Any ideas on the rear end. See previous post.