V70 TRACS/ABS: - Intermittent STC symbol

Georgeandkira · Jul 12th, 2023, 19:21

2007 V70 base 136K
Once 2 months ago and again yesterday and today the STC warning light (vehicle with trailing swerve marks) came on quite early during the first drive of the day.
I didn't notice if it came on upon startup.
After 10 or so minutes of driving, the light goes out.

I'm away from home (tools/code reader) at the moment so I can just ask if this sounds familiar to anyone.

Brakes feel fine and I don't drive crazy at all, thus providing no way to draw any performance comparisons.

When I do get home I'll check for codes.

During a wheels-off inspection, what should I look for?
I'm thinking check for cracked / rusted pulse wheels, frayed wire to the sensor.......and what else?

Can worn brakes trigger this?

Cheers

davebb · Jul 12th, 2023, 20:57

Hi this is if one front wheel spins faster then the other, so if it was not a wheel spin(if it was a wheel spin it would only be on for milli seconds, it could be one of the front speed sensors or rings need changing, it can happen if you have a bad wheel bearing, or loose drive shaft bolt,and no brakes will not do this,
Dave

MWMan · Jul 15th, 2023, 05:14

The only time I have had this on my vehicle, was when a reluctor ring had a crack. The crack wasn't that obvious.
See attached photo.

myfirstv70 · Jul 15th, 2023, 06:58

I had a cracked reluctor ring - I had the symbol but I did notice that going around corners the car would start braking a wheel to compensate for the 'skid' I wasn't having! I thought was possessed by the devil until I saw the traction control light!....I think the issue can show up if the yaw sensor is knackered and tells the car it's drifting when it's clearly not....
HTH,
Nobby

Jul 12th, 2023, 19:21	#1
Georgeandkira Premier Member Last Online: Yesterday 21:02 Join Date: Feb 2009 Location: Hackensack	Intermittent STC symbol 2007 V70 base 136K Once 2 months ago and again yesterday and today the STC warning light (vehicle with trailing swerve marks) came on quite early during the first drive of the day. I didn't notice if it came on upon startup. After 10 or so minutes of driving, the light goes out. I'm away from home (tools/code reader) at the moment so I can just ask if this sounds familiar to anyone. Brakes feel fine and I don't drive crazy at all, thus providing no way to draw any performance comparisons. When I do get home I'll check for codes. During a wheels-off inspection, what should I look for? I'm thinking check for cracked / rusted pulse wheels, frayed wire to the sensor.......and what else? Can worn brakes trigger this? Cheers

Jul 12th, 2023, 20:57	#2
davebb Premier Member Last Online: May 31st, 2024 09:56 Join Date: Aug 2013 Location: Emsworth,hants	Hi this is if one front wheel spins faster then the other, so if it was not a wheel spin(if it was a wheel spin it would only be on for milli seconds, it could be one of the front speed sensors or rings need changing, it can happen if you have a bad wheel bearing, or loose drive shaft bolt,and no brakes will not do this, Dave Last edited by davebb; Jul 12th, 2023 at 20:59.

Jul 15th, 2023, 06:58	#4
myfirstv70 Senior Member Last Online: Yesterday 17:25 Join Date: Dec 2008 Location: Lincoln	I had a cracked reluctor ring - I had the symbol but I did notice that going around corners the car would start braking a wheel to compensate for the 'skid' I wasn't having! I thought was possessed by the devil until I saw the traction control light!....I think the issue can show up if the yaw sensor is knackered and tells the car it's drifting when it's clearly not.... HTH, Nobby

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