Traction control light

1921 Views 5 Replies 5 Participants Last post by jzchen, 17 d ago

Jdcell100

Discussion Starter · Feb 17, 2014

We'll my iq is handling the snow here in pa like a champ the other day was driving in a snowstorm looked down and my traction light on dash was on along with check engine light. It would not turn off (light on dash) so I immediate called dealer told me to bring it right in an hour later service advisor told me a plug came loose that controls the traction control. So it had to be plugged back in then he said check engine light was do to an oxygen sensors they had to order me one. The guy was telling me the check engine light had to come on first told him it dident they came on at the same time anyone else have this happen?

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tenmoi08

· #2 · 1 mo ago

I have Scion IQ 2012, my traction light came on few days ago with check engine with ODB code P0842, don't know what caused the problem.
Few weeks before this happened when I shift gear from Reverse to Drive it took times to engage the gear forward.
Does anyone know what I need to do without going to the dealer.

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BamZipPow

· #3 · 1 mo ago (Edited)

tenmoi08 said:
I have Scion IQ 2012, my traction light came on few days ago with check engine with ODB code P0842, don't know what caused the problem.
Few weeks before this happened when I shift gear from Reverse to Drive it took times to engage the gear forward.
Does anyone know what I need to do without going to the dealer.

Welcome to the forums!

A quick search came up with this:
P0842 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch A Circuit Low

How many miles on yer iQ? Any maintenance performed prior to this issue? Have you had the CVT fluid inspected/changed lately? If so, who did the maintenance? If it's a shop that's not familiar with this CVT, chances are that the fluid is too low and needs to be properly filled. There is a specific process in order to fill the CVT fluid correctly. I would also recommend the proper Toyota/Aisin CVT TC fluid to be used instead of the aftermarket "universal" fluid.

Have you inspected underneath the CVT to see if there are any signs of fluid leaks?

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jzchen

· #4 · 19 d ago

I was surprised when @Baliguy informed me that Scion/Toyota changed the spec one model year. I’m afraid I am not clear which year. Check your model year’s owners manual to verify what is in yours…

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Baliguy

· #5 · 19 d ago

Mine is a 2012. I think either would work unless you are at an extreme temperature. The fill plug will be marked "TC" for example. The one for colder temps is a little thinner; the one for hotter climates is a litter thicker. There is no dipstick. You top it off when it is all warmed up and it dribbles out of the stand pipe. There is a specific temp and the stand pipe is above, (or is it under?) the drain plug. The dealer will know nothing about any filter, but I did change mine thanks to jzchen.

jzchen said:
I was surprised when @Baliguy informed me that Scion/Toyota changed the spec one model year. I’m afraid I am not clear which year. Check your model year’s owners manual to verify what is in yours…

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jzchen

· #6 · 17 d ago

I definitely agree that whichever it is works fine, especially since Scion/Toyota decided to put it in. I guess my concern is not knowing what happens if someone adds one to the other? I’d be real nervous to do that. It’s also not uncommon to buy fluids online nowadays and if you get the “wrong” type there may be cost involved in exchanging/returning it…

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