2000 Chevy Silverado trouble code

PARAMEDICCHRISW

MEMBER
2000 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
146,500 MILES

My z-71 has been showing service 4 wheel drive. I recently replaced the transfer case and it is still showing it. I had it checked to see what code it is setting and it showed 305 PROP switch. What does this mean and how do I fix it? Any help greatly appreciated. Thanks.

5 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

The code u gave is missing a letter and a number at the beginning of it
recheck and resubmit the code

possible bad switch
also when u replace the transfer case did u use the old encoder motor and sensors
and if so the motor is a very high possibility

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Sunday, August 31st, 2008 AT 8:24 AM

PARAMEDICCHRISW

MEMBER
3 POSTS

To be honest it was showing the service code prior to changing transfer cases and I dont know if anything other than the transfer case was swapped out. I paid a guy who owns the transmission shop here in town. And the 305 prop switch code I got was from another shop who put it on their computer at their shop. They said I would have to go to a gm dealer or 4x4 place to see what it is. And thats the exact code he wrote down for me.

Was this

answer

helpful?

Yes

No

Sunday, August 31st, 2008 AT 9:07 AM

BMRFIXIT

MECHANIC
19,053 POSTS

What is very common is the encoder motor on the transfer case
try to get the system scanned for codes
u need a scanner to do so
OBDII code reader will not help here
scanner is needed to access the tranny and transfer case codes
I tried looking for 305 but nothing

Was this

answer

helpful?

Yes

No

Sunday, August 31st, 2008 AT 10:24 PM

PARAMEDICCHRISW

MEMBER
3 POSTS

Yep that is what I have been told and it has the encoder motor that came on the new transfer case instead of the old one. And like I said before it was setting the service 4wheel light with the old encoder in place also. I appreciate your help but, it has tried my nerves. I checked with o'
riley auto parts and they said the 305 code is a misfire on #5 cylinder. Thanks again for your help.

Was this

answer

helpful?

Yes

No

Monday, September 1st, 2008 AT 12:54 PM

BMRFIXIT

MECHANIC
19,053 POSTS

P0305 is a misfire on cylinder # 5
C0305 is an ABS sensor out and so on.

The reason I was asking for the whole code #
none of the two codes has any thing to do with the 4x4

if it is a used transfer case that they used
chance is the encoder motor is bad

very common problem
they are so common GM but out a TSB on it

good luck !