# 2000 Suburban "Service 4WD" warning lite

**URL:** <https://community.cartalk.com/t/2000-suburban-service-4wd-warning-lite/35810>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, suburban\
**Created:** [August 30, 2009, 2:50am UTC](https://community.cartalk.com/t/2000-suburban-service-4wd-warning-lite/35810 "2009-08-30T02:50:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![petesz](https://avatars.discourse-cdn.com/v4/letter/p/91b2a8/32.png) [@petesz](https://community.cartalk.com/u/petesz)\
**Post date:** [August 30, 2009, 2:50am UTC](https://community.cartalk.com/t/2000-suburban-service-4wd-warning-lite/35810/1 "2009-08-30T02:50:32Z")

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This light comes on frequently, and I have been to three garages to check system. All three say the system is fine (which I already knew since I use 4WD often) and can’t explain why the light comes on. I live in a remote mountain area of West Texas 200 miles from the closest Chevy dealer. I would be reluctant to take it to a dealer anyway since I’ve had two Chevy dealer experiences where the “Check Engine” light came on and I was charged over $600 only to have the light come back on in a few days.  
  
  
  
 What’s up with “Service 4WD,” does anyone know? This is very important because, as I say, I use 4WD often on remote roads where I can’t have drivetrain problems. BTW, this vehicle has 115,000 miles on it.  
  
  
  
 Many, many thanks in advance. Pete

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**Author:** ![hd72mm](https://avatars.discourse-cdn.com/v4/letter/h/9fc29f/32.png) [@hd72mm](https://community.cartalk.com/u/hd72mm)\
**Post date:** [August 30, 2009, 8:54am UTC](https://community.cartalk.com/t/2000-suburban-service-4wd-warning-lite/35810/2 "2009-08-30T08:54:53Z")

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Wonder if it is not a light to remind you to change oil in 4wh drive system?

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**Author:** ![petesz](https://avatars.discourse-cdn.com/v4/letter/p/91b2a8/32.png) [@petesz](https://community.cartalk.com/u/petesz)\
**Post date:** [September 1, 2009, 2:33am UTC](https://community.cartalk.com/t/2000-suburban-service-4wd-warning-lite/35810/3 "2009-09-01T02:33:29Z")

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Perhaps so, but I change the oil in transfer case every 30k miles or so. Maybe the sensor doesn’t realize I’ve changed it. Thanks so much for the reply, amigo. It’s worth looking into.