patrick young

i have 2004 Chevrolet Silverado 4x4 z71 extended cab and the service 4wd indicator is on.
when i start my truck the lights on the 4wd switch comes on and then goes right back off. so i changed the switch and that didn't fix the problem so i changed the transfer case module and still doing the same thing. any ideas?

tech2

post the codes set in the transfer case control module.

patrick young

what codes

tech2

if you have a fault in the 4wd system; the module that controls it may detect a fault. checking for codes is the starting point

patrick young

i hooked it up to my obd2 and no codes

Allmotorbeas

I'm having the same problem, 2004 crew cab 4X4. I only have 70,000 miles. I ready replace the button switch know I don't know what to do or just take it into the dealer?

Joe P

I had the same problem with my 2005 Z71 off & on for the past 3 years. This past December I finally had to deal with it. Luckily it hung up in 2WD & not 4LO. I had come across a youtube video showing how to check the dash switch. I went through that process & all ohm readings were perfect. I had a shop pull the codes because the std code readers can't read the 4WD codes. I can't remember the code but it pointed to the inducer motor. They wanted $650. I have read of guys paying more. I had also read a post that I will try to quote. "If your 4x4 works fine most of the time, it isn't a mechanical problem. It's an electrical problem." There is a sensor inside the inducer motor that costs about $50. I pulled the inducer motor & put in a new sensor. It has run fine for 3+ months.

tech2

...encoder motor
do you have a pic or part number of the part you installed

Joe P

Here is a pic of the sensor & the inducer motor gasket as well as the motor that it fits in.

Stormbo

On my 2004 crewcab that I just bought two days ago the service 4wd in the message area comes on and off but the 4wd works perfect. Should I replace this sensor?