"Check AWD" light goes on periodically

"Check AWD" light goes on periodically

Postby JuneauCabbie [OP] » May 13th 2011, 2:30pm

This is a real puzzler! :banghead:

My "check AWD" light goes on once in a while, almost always after I turn the engine off and back on after I have driven my 2003 Safari for 50-60 miles or several hours. My Scangauge shows no codes set, and the light will not be on when I start the rig the next morning.

This happened before I changed the the tranni and diff fluids a couple of weeks ago, and then didn't happen for several weeks. Since the tour season is starting, and Taku Taxi 73 will be running all out for 12-15 hours 5 days per week, I'd like to fix this problem soon --- I will be driving 1000 miles/week by the midde of next month.
:layrubber:

I have a good wrench who does not over or under fill the fluids, and who used all GM fluids. Clues, anyone?
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Re: "Check AWD" light goes on periodically

Postby Leeann_93 » May 13th 2011, 9:54pm

Without the code, it's impossible to tell. When you get the light, take it directly to your wrench and leave it running - see if he can pull the code. He'll need an ABS-capable scanner (not all scanners are equal) to do so.
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Re: "Check AWD" light goes on periodically

Postby dualsport » August 31st 2011, 12:44am

Hey Cabbie- Did you ever get a resolve on this periodic AWD light? I've got a similar situation up here in Fairbanks and was hoping to find something on this forum.

Thanks...
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Re: "Check AWD" light goes on periodically

Postby drmmhmd » August 31st 2011, 3:07am

clean the grounds, the 2003 (1999 onward) uses a shift control module in the transfer case, when the vehicle senses different wheel rotation velocities the transfer case electronically engages and drive is applied to the front differential. the most common problems are simply connections that are contaminated or grounds that are not grounding or grounding intermittently. one of the AWD error lights occurs when the front does not engage when wheel rotation velocity differs.

I have the same problem, the manual states it could be an open circuit from our transfer case shift control module to the transfer case encoder motor. I have not had tme to look at this because of weather and time but this is where I'd start.
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Re: "Check AWD" light goes on periodically

Postby JuneauCabbie [OP] » September 1st 2011, 9:37am

dualsport wrote:Hey Cabbie- Did you ever get a resolve on this periodic AWD light? I've got a similar situation up here in Fairbanks and was hoping to find something on this forum.

Thanks...


Well, it finally stayed on long enough I could drop by a shop where they had the right scanner, and it was a DTC C3010. Motor A/B Circuit Open. Could be a worn encoder motor or just bad connections. I'm going to ask them to check connections/ground before ordering a replacement, since it will be up on the lift for something else. Found one on Amazon for $97, and labor would be about an hour.

I'm thinking it might be connection/ground because it's still intermittent.

Nice to see another Alaskan posting.
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Re: "Check AWD" light goes on periodically

Postby dualsport » October 17th 2011, 11:29pm

Nice to see another Alaskan posting.

I was actually in Jnu the other day for the first time and really, really enjoyed it. And I was wonderin if I'd run across an Astro/Safari cabbie! :)

I did manage to hit some of the highlights though, including a SE waffle- good stuff.

We just got our first real snow yesterday (didn't melt off) but I'm facing the ole AWD issue again. I'm fixin to crawl underneith in a few minutes. I'm just sharpening my focus here on the forum real quick...

Amazon, eh? I'll give 'em a looksie if it's the encoder.

Thanks for the tip.
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Rear: superior leaf helpers & homemade shackle lift
235/75/15 BFG ATs
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Re: "Check AWD" light goes on periodically

Postby strangerock » October 27th 2011, 10:53pm

My 02 got a C0310 , I was able to check the encoder motor when the light was active and found it was open ...until I tapped it lightly ...has a dead spot in the motor and that explains why it was intermittent. I was able to read and clear my own codes with a pc based scan tool and software with an OBD II terminal.
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