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4X4 light flashes

Tiny
TIREGUY79
  • MEMBER
  • 1996 CHEVROLET SILVERADO
  • 196,000 MILES
I got the truck on a trade 4 wheel drive lights just flashed so I put front axle acuator in and now it locks in but light flashes on 4hi or when in 4lo
Monday, January 25th, 2016 AT 8:44 PM

13 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes first check to see if encoder motor on tcase is getting power
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Tuesday, January 26th, 2016 AT 6:25 AM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
If it wasn't getting power then how is it switching into four wheel drive
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Tuesday, January 26th, 2016 AT 7:40 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Because yo have a thing called a tcm or transfer case module that may be screwed up.
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Tuesday, January 26th, 2016 AT 9:29 AM
Tiny
TIREGUY79
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  • 35 POSTS
Ok I will check that and scan codes I will let you know thanks
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Tuesday, January 26th, 2016 AT 9:42 AM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
What years of Chevy and models have same module my axle acuator is out of a 99 suburban
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Tuesday, January 26th, 2016 AT 9:44 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
They shold cover a few different years the actuator shouldn't matter. Check with auto parts for that kind of stuff
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Tuesday, January 26th, 2016 AT 9:51 AM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
So I put another push button switch in and another tcm module still doing same thing
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Saturday, January 30th, 2016 AT 4:28 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Did you scan it like I said? Encoder motors on tcase are a high failure rate but scan it first see if you get anything auto parts can do it.
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Saturday, January 30th, 2016 AT 4:37 PM
Tiny
TIREGUY79
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  • 35 POSTS
Yes I just had it scanned and nothing showed up
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Saturday, January 30th, 2016 AT 5:00 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
So is the incoder motor the same thing as the acuator motor or is it another motor or should I say how many motors are on transfer case
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Saturday, January 30th, 2016 AT 5:02 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
It feels like it locks in but when I drive it it don't hop or seem like it's working even in 4lo it drives like it in 4lo but same thing it don't hop but thing is that it only clunks when your in nuteral and its loud the truck jerks like front wheels are locked but I drove in gravel and couldn't feel front tires spinning seemed like just back tires was spitting rocks
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Saturday, January 30th, 2016 AT 5:07 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There is an encoder motor on tcase and another on the axle see pic. I can be of no further help it's best you have a pro look at this. The switch goes to the tcm to apply the 4wd so i'm sure there is a tcm problem of some type.
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Sunday, January 31st, 2016 AT 8:21 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Forgot pic
Image (Click to make bigger)
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Sunday, January 31st, 2016 AT 8:22 AM

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