Intermittent Stabilitrak light

David Technician Saginaw, Michigan Posted   Latest   Edited  
Unsolved
Chassis
2014 GMC Terrain Denali 3.6L (3 LFX Flex) 6-spd (6T45)
Intermittent

Customer states on cold start first thing in morning, Stabilitrak light comes on and ABS pump cycles. 

Can not duplicate. Only found history codes for shorted to ground Traction control switch. Watched data for speed sensors and found no problem.

All modules are communicating. Battery Tests fine. 

Any thoughts on direction?

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Maynard Technician
Elmira, Ontario
Maynard Default
 

Was there any history U codes in any modules? It seems when there is CAN bus issues the first indication to the driver is TRAC/ABS light, even when there is nothing wrong with that system, its almost like TRAC light is a malfunction indicator light for CAN bus issues

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David Technician
Saginaw, Michigan
David Default
 

Yes, there are some history u codes in a couple modules( show me a GM that doesnt!!!) Thats what I was thinking as well, need to duplicate and catch it . Thanks !!

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Rick Technical Support Specialist
Saint Charles, Missouri
Rick Default
 

Is the switch close to a shelf where the driver will set stuff on it like cell phone, GPS or other stuff that is pressing the switch for a prolonged period of time? Just saying? I've seen that before lol.

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David Technician
Saginaw, Michigan
David Default
 

The Traction control switch is directly behind the Shifter and in front of a little cubby. I'll have to get more information from customer and attempt to duplicate. Weird that Customer states it happens only first thing in morning and not again( I'm Suspecting an intermittent communication problem). I would think that if customer was inducing,it would happen more frequently and just not cold…

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Caleb Technician
Mishawaka, Indiana
Caleb Default
 

We have had the "Eco" switches in the center console on Equinox an Terrian get full of drinking something spilled by the customer. Could be happening with the TC switch being you have a code or could be completely unrelated. Otherwise you need to connect a scope to pins 6 an 14 and keep the car till you duplicate it.

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David Technician
Saginaw, Michigan
David Default
 

Thanks

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Will Mobile Technician
Richardson, Texas
Will Default
 

I've had a similar issue with a Buick before. Like caleb had said , the customer will spill something near the cup holder and the substance will get down into the switch and cause a short to ground dtc and communication dtcs. Sometimes also as the internal temperature of the vehicle will change it can cause the switch to act up due to the substance getting hot. Definately would pull the switch…

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