Humidity set off Traction and Stabilitrak

[novemberr]

The truck is 2012 Denali XL, 106K miles, no mod.
I have experienced a weird problem since November last year. It happened 4 times only in humid weather after rain/snow.
During normal driving in a humid day, both Traction and Stabilitrak were set OFF with some burning smell.

Engine codes P0206 P0300 P0306 showed up twice. Engin shaked and stalled once. Code C0561 showed up once.
I checked the resistance of injector circuit/wire with a multimeter and all fluid level are in range.
I used a generic bluetooth OBD scanner to clear the codes. The truck was driving fine in sunny/dry weather.

There was a snow storm in NJ yesterday. I started the engine to idle for 30 minutes without moving. No warning light came on. Drove another 30 minutes without problem.

I searched online. A lot of people had this Traction/Stabilitrak problem, but not in humidity.
My guess is the wheel bearing or ABS sensor. But I'm not sure about it and eager to hear opinion here.

Appreciate your thought and input.

 

[novemberr]

 

[Fless]

IIRC the misfire issue will trigger those functions off.

 

[novemberr]

IIRC the misfire issue will trigger those functions off.

Do you mean that the misfire caused Traction/StabiliTrak OFF. Will misfire happen intermittently? Will misfire happen at engine idling?
Thanks for help.

 

[novemberr]

The Traction/StabiliTrak light came on before flash engine light. Does this still imply the the misfire may be the root cause?

 

[Fless]

I have heard that about misfires, but I can't confirm as I have not experienced it on mine (it's old enough to drink...). Maybe others will chime in.

 

[Foggy]

Misfires will cause it to go to "limp mode" which always sets off the
traction control abs wheel speed kinda stuff.
You need to fix the p206 & p306.. Cylinder 6 misfire and/or injector
or wiring issue for sure. The P0300 almost always sets with specific cylinder
misfires. maybe time for plugs, wires, injector cleaning imo

 

[novemberr]

Thank you all for kind advice. I drove the car the whole afternoon today. Everything is normal.
This problem really got me.

 

[Foggy]

Thank you all for kind advice. I drove the car the whole afternoon today. Everything is normal.
This problem really got me.

You def have an issue.. If you keep getting misfires, You'll toast your cat converters
very quickly. I'd at least get some OE acdelco plugs and plug wires at very minimum

 

[Marky Dissod]

Since nearly all the misfires are at cylinder #6, try swapping plug wires with cylinder #1.
If the problem moves to cylinder #1, you need a new plug wire.

If the problem stays with cylinder #6, try swapping COILS with cylinder #1.
If the problem stays with cylinder #6, you need one new spark plug.
If the problem moves to cylinder #1, you need a new coil.

 

[rdezs]

I concur with the above completely. I would also inspect the harness to the coils.

 

[j91z28d1]

Since nearly all the misfires are at cylinder #6, try swapping plug wires with cylinder #1.
If the problem moves to cylinder #1, you need a new plug wire.

If the problem stays with cylinder #6, try swapping COILS with cylinder #1.
If the problem stays with cylinder #6, you need one new spark plug.
If the problem moves to cylinder #1, you need a new coil.

feels like this is probably a coil breaking over to ground when it's wet. is my guess. Definitely do this coil swap. or I've even seen a loose spark plug cause weirdness.

 

[Fless]

Since nearly all the misfires are at cylinder #6, try swapping plug wires with cylinder #1.
If the problem moves to cylinder #1, you need a new plug wire.

If the problem stays with cylinder #6, try swapping COILS with cylinder #1.
If the problem stays with cylinder #6, you need one new spark plug.
If the problem moves to cylinder #1, you need a new coil.

^^THIS. One at a time so you can tell the cause.

 

[Marky Dissod]

Since nearly all the misfires are at cylinder #6, try swapping plug wires with cylinder #1.
If the problem moves to cylinder #1, you need a new plug wire.

If the problem stays with cylinder #6, try swapping COILS with cylinder #1.
If the problem stays with cylinder #6, you need one new spark plug.

If the problem moves to cylinder #1, you need a new coil.

If the problem stays with cylinder #6 after all that, swap injectors ...

 

[Charlie207]

I've even seen a loose spark plug cause weirdness.

This^^^

For some reason the LS blocks like loosening spark plugs on their own.

Also check for corrosion on each end of the plug wires. Over the years the New England states have been upping the amount of storm pre-treatment on the roads, and that brine mist gets absolutely everywhere; in all the nooks & crannies. An hour or two on a treated slushy interstate behind traffic will absolutely coat your engine and engine bay with the White Death.

I try to monthly (or more if I can) pop the hood at the car wash and spray down the engine bay with it running. And I've been slowly filling every connector with dielectric grease to help seal them from the elements. I love NH, but the roads are absolute hell on steel.

 

[novemberr]

I'm going to order new plug wires and coils. The plugs were changed at 80k miles (running for 20k miles). Should the plugs be replaced regardless?
There is only one option for plug wires on RA, lots of choices on coils. Which coil would be recommended? Economy, Premium, Standard, High Performance.
I also want to do a injector cleaning with Red Line addictive. Is this a good idea?

Thank you all for the advice.

 

[donjetman]

I'm going to order new plug wires and coils. The plugs were changed at 80k miles (running for 20k miles). Should the plugs be replaced regardless?
There is only one option for plug wires on RA, lots of choices on coils. Which coil would be recommended? Economy, Premium, Standard, High Performance.
I also want to do a injector cleaning with Red Line addictive. Is this a good idea?

Thank you all for the advice.

I purchased and installed "counterfeit" AC spark plugs, and after 20k miles gap had growned from .040" to .065" and started throwing a P0300 code. Here's the thread I did:
https://www.tahoeyukonforum.com/thr...iring-at-idle-counterfeit-spark-plugs.146952/

 

[novemberr]

I purchased and installed "counterfeit" AC spark plugs, and after 20k miles gap had growned from .040" to .065" and started throwing a P0300 code. Here's the thread I did:
https://www.tahoeyukonforum.com/thr...iring-at-idle-counterfeit-spark-plugs.146952/

I replaced with ACDelcoProfessional Iridium Spark Plug Part No 41-110 ordered from Advance Auto Parts.
I will check the plugs and try NGK if they are bad.
Thank you.