Serious VSC Issue - Need Help (1 Viewer)

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Joined
May 12, 2021
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Location
WNC, USA
***The shop has more or less washed their hands of the issue they created***

This past January (2021) I took my vehicle in for its annual service. This typically involves oil change, balance/rotate tires, alignment and the annual state inspection.

While rotating the shop saw I had a fr. right caliper sticking. Had them replace it; had been having issues with that caliper locking up during hard braking but no one could duplicate it for 5-years.

They could not align the GX due to worn bushings. Ordered Whiteline bushings and they were later installed.

During the alignment the shop said they had it as close to specs as possible. On the way home the dash lit up light and noticed a slight vibration on tight turns. Back to the shop, read the codes and the steering wheel “alignment” sensor caused the codes. Apparently the bushings weren’t the right fit but were the right part number. Shop recommended a replacement reman rack & pinion assembly with bushings should certainly be made for the r&p. And there’s a pinhole in the radiator; replacement ordered.

Parts arrived, all went in without issue. Alignment was near perfect from my observation.

Nightmare begins: On the way home, going around corners with small dips at a speed that was slower than I normally drive, the VSC kicks on killing the engine power while applying the ABS. This happened not once but 3 times on the way home. The dash lit up as expected during the event and cleared out once it “was deemed safe.”

The vehicle has now been to two dealerships (Lexus and Toyota in eastern TN). Neither were able to duplicate it or pull any useful codes from the GX. The local shop indicated no useful codes when the VSC kicks on.

On the return trip from Toyota the, local, mechanic claimed the VSC kicked on while driving around 60mph causing him to veer into the next lane.

On the trip back from Lexus the, local, mechanic accelerated around and onto highway ramps without incident. Though once he entered The Tail of The Dragon the VSC kicked on frequently.

After 5 months there has been no resolution and have been driving around with VSC disabled and with that ABS is disabled.

Before the annual service there were absolutely no issues with the GX. Previous repairs are rotor and pads all around, water pump and timing belt.

Tire pressure and wear is normal, within spec.

Hoping that reaching out will provide some useful insight and information but likewise don’t want to just throw new parts on it hoping something fixes it. The shop has more or less washed their hands of the issue they created.

This is my only vehicle at present. The last thing I want to do is sell it or give up on fixing the issue.

Year: 2009
Mileage - 99,89X
KDSS: No
Annual Miles - 2.5k to 3k
Parts Replaced (This Issue)
- Fr. R Caliper (non-Lexus)
- Radiator (non-Lexus)
- Rack &Pinion Unit (non-Lexus)
 
Have you tried a zero point calibration after all that work was done?
 
Supposedly the tech tried this. I’ll reach out to him again and forward this video. Thank you.

What’s not clear from the video: He’s having crawl control recognized/calibrated. I just need the VSC sensor recalibration. Would I just let the lights flash (after clearing and turning accessory on) and then just turn accessory off?
 
It's the same process regardless of installing the Crawl Control switch or if you're just trying to calibrate the VSC.
 
It's the same process regardless of installing the Crawl Control switch or if you're just trying to calibrate the VSC.
Excellent. Will certainly try this out the right way and report back. Really appreciate it.
 
I though your issue is the same as this but not quite. He got the traction control light on all the time and that doable the stability control.


Yours is random VSC activation. Usually triggered when the system detect wheel speed difference that is our of allowed difference.
Possible causes :
1. A worn/miss installed wheel bearing can trigger abnormal wheel speed reading
2. Seized caliper
3. Steering angle sensor calibration off

I would invest in techstream and try to monitor all the wheel speed sensor, steering angle sensor, yaw sensor and acceleration sensor.

There is a 5 min guide to techstream here somewhere.
 
I’ll check out Techstream. Didn’t think about the wheel bearings. Funny about the seized caliper, that’s why the front right one was replaced during this visit though it never threw a code.

My honest guess is that it has something to do with the rack & pinion or the replaced caliper.

I’ve never had any lights come on prior to this aside from the maintenance reminder and a fuel cap issue. Driving it was event free even on The Tail of The Dragon when nearly on 3 wheels around a corner.
 
I would absolutely do the Zero Point Calibration yourself to rule that out. I bet your Indy shop just pulled the codes but never actually calibrated anything, and it probably didn't even need a steering rack.
 
I would absolutely do the Zero Point Calibration yourself to rule that out. I bet your Indy shop just pulled the codes but never actually calibrated anything, and it probably didn't even need a steering rack.
Yeah, that’s prob true. I thought it was odd also with only 99k on the odo. At this point I just want to fix it, then I’ll find another shop.

Just finished the switch for the ZPC. Hardest part around here is finding flat/straight ground with enough runway for a 10 second 25 mph jaunt (required apparently).
 
Yeah, that’s prob true. I thought it was odd also with only 99k on the odo. At this point I just want to fix it, then I’ll find another shop.

Just finished the switch for the ZPC. Hardest part around here is finding flat/straight ground with enough runway for a 10 second 25 mph jaunt (required apparently).
Finding a straight road is difficult in my area as well. I drove for about 10 minutes on curvy roads at 20 MPH or less after doing the OBD procedure. When I got to a short straightaway, I hit it for the required time, and the calibration was successful.

Toyota service manual says a ZPC is required whenever steering and/or suspension components are replaced or when alignment is done (don't remember which, possibly both).

Recently took my truck to Toyota suspension specialist for alignment, wrote on service request that I wanted ZPC due to components changed. They did not do it. Their excuse was that there were no codes.

Hope you get this fixed.
 
Finding a straight road is difficult in my area as well. I drove for about 10 minutes on curvy roads at 20 MPH or less after doing the OBD procedure. When I got to a short straightaway, I hit it for the required time, and the calibration was successful.

Toyota service manual says a ZPC is required whenever steering and/or suspension components are replaced or when alignment is done (don't remember which, possibly both).

Recently took my truck to Toyota suspension specialist for alignment, wrote on service request that I wanted ZPC due to components changed. They did not do it. Their excuse was that there were no codes.

Hope you get this fixed.
Excellent. Thank you for the input. I imagine that’s why Toyota or Lexus did not ZPC when they had it. No codes anywhere. The Indy shop said he did it but my guess is that it wasn’t done correctly.

I’ve got to run into town today. Will reconnect VSC/ABS and find a stretch of road for the straight run, keeping her around 20 mph until then.

Thanks again all. Will post the results later today.
 
It's been a while since I did the ZP calibration on mine. If I remember correctly, once the calibration was done after the 20mph drive, the two front wheels showed up again in the icon in the dash. When the calibration was cleared the font wheels were missing. But this might not be the case for all of the GX's.

Screen Shot 2021-05-14 at 7.21.24 AM.png
 
Neither of my local Lexus and Toyota dealers perform a ZPC unless there are codes. And I'm about to tear apart most of my suspension and align it myself, and I'll also probably avoid it unless there is an issue. But I have Techstream so I'll check how everything is running once I'm done.
 
First, I would like to thank everyone for your input and assistance.

I noticed a few differences between the 1st and 2nd gen GX when performing the ZPC.

1) 1st Gen - there is no audible beep at any time.
2) 1st Gen - only the ABS light flashes when calibration is cleared. No traction light flashing once then 3 times
3) In the video he mentions a flashing pattern when turning Accessory to recalibrate. I saw just the brake, ABS, VSC flashing at the same time.

So hopefully I did it right. I did have VSC kick on once briefly right after programming going up a winding road. Hasn’t happened again. It is certainly nothing like before.

Does this sound normal? I’m going to do the ZPC again at a later date probably when not in the mountains.

F5F51925-129F-497C-9457-77E513766650.jpeg


Edited: Removed all you fancy Lexus’ owners, may have come off the wrong way.
 
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When I lifted my 2016 460 the steering wheel angle was 90* off. VSC would kick in randomly, similar to what you described. I took it to the alignment shop and when they corrected it I got a VSC light on the way home.

ZPC did the trick and its been fine since with no lights or unwanted VSC.
 
I’ll keep monitoring it. So far seems good. 👍



It's been a while since I did the ZP calibration on mine. If I remember correctly, once the calibration was done after the 20mph drive, the two front wheels showed up again in the icon in the dash. When the calibration was cleared the font wheels were missing. But this might not be the case for all of the GX's.

View attachment 2673815
This is not a feature on the 1st Gen. All electric analog, no screens except Nav. I’m thinking that’s why the lights/sounds were different when doing the ZPC.
 

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