Just returned from a 5000 mi rt from AZ to VA. Drove thru lots of rain on and off. No time during the trip did I use 4wd. On the return after driving about 600 mi as we were pulling into the motel the SERVICE 4WD light comes on. My recollection is none of the mode switch indicator lights were on. After a 10 min restart the light was off and was off the next morning. After driving a couple hours it's back on. Sometimes after a 10 min or so ign off it will stay off for some period of time.
This behavior continued for the next couple days with the service light on and off. The mode switch lights were never on. When started the Service 4wd light comes on to indicate the bulb is good, none of the mode switch lights come on but when the ign is first turned there is a dull red N at the far CC position that comes on for a couple seconds, go off and comes on again for a couple seconds when the engine is started.
I've read several of the postings but it appeared most problems occurred when a 4wd mode was selected.... not my case.
I haven't done much trouble shooting other than pulling fuse 25 and verified it to be good.
Next week I've got a friend with a scanner that can read chassis and body codes. No powertrain codes are present.
I've read several TSBs that refer to various DTC codes with remedies that vary from a reflash to making a new cable because of corrupt data between the TCCM and transfer case speed sensor.
Anyone experience a similar situation?
The vehicle is a 03 Envoy with 101000 miles.
This behavior continued for the next couple days with the service light on and off. The mode switch lights were never on. When started the Service 4wd light comes on to indicate the bulb is good, none of the mode switch lights come on but when the ign is first turned there is a dull red N at the far CC position that comes on for a couple seconds, go off and comes on again for a couple seconds when the engine is started.
I've read several of the postings but it appeared most problems occurred when a 4wd mode was selected.... not my case.
I haven't done much trouble shooting other than pulling fuse 25 and verified it to be good.
Next week I've got a friend with a scanner that can read chassis and body codes. No powertrain codes are present.
I've read several TSBs that refer to various DTC codes with remedies that vary from a reflash to making a new cable because of corrupt data between the TCCM and transfer case speed sensor.
Anyone experience a similar situation?
The vehicle is a 03 Envoy with 101000 miles.
