Traction Control Issue on 4" Lifted Base w/ 37's

[Love Shop Auto Lo]

Greetings!

Question:
Has anyone encountered this issue before? I was looking for either a solution or perspective on how to attack this problem. I've browsed the forums and can only find the tire size reprogram fix. Is there anything else to look out for? Thanks in advance

Story:
We recently lifted a Base 2.3 Bronco to 4"

Issue:
-Traction control kicks on instantly on turn-in in any situation
-Ford service states that its throwing YAW sensor codes

Theories:
-Truck hasn't been programmed to accept 37's so it's throwing off the traction control system

Upgrades:
Lift/ Height:
-Eibach Coilovers
-4.1" Front lift
-3.8" rear lift
-SPC UCA

Wheels:
-Stock sas wheels
- 37" BFG KO2

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[Aztec1382]

Try forscan to increase the tire size

 

[mj63]

Stability control needs to know your speed accurately because that is one of the primary inputs (along with steering wheel angle) into it's internal bicycle model which outputs a target yaw rate which then gets compared to measured yaw rate. That yaw error is what much of the stability control is based off of, and there are lots of checks to try and detect errors coming from the sensors.

If you haven't updated tire circumference, try that first. If that doesn't fix the issue, then you might have changed the vehicle's response to steering enough that your only options are to revert back to smaller tires/less lift or run with faulted ESC (which will likely prevent lots of other things from working properly).

This is a thing on all modern vehicles, for better or worse.

 

[Rednek]

it will also require after a alignment to relearn vehicle dynamics for straight ahead and collision avoidance

 

[Grumpy]

What year is the Base 2dr? 21-22 you can do the tire circumference update using SuperChips FlashCal. It is easy OBDII plug in programmer that can be updated continuously and many other Bronco settings you can reprogram. Well worth it in my opinion, I reprogrammed for 37's, auto headlight, double horn alert, TPMS, auto start and stop.

 

[BryantC]

Greetings!

Question:
Has anyone encountered this issue before? I was looking for either a solution or perspective on how to attack this problem. I've browsed the forums and can only find the tire size reprogram fix. Is there anything else to look out for? Thanks in advance

Story:
We recently lifted a Base 2.3 Bronco to 4"

Issue:
-Traction control kicks on instantly on turn-in in any situation
-Ford service states that its throwing YAW sensor codes

Theories:
-Truck hasn't been programmed to accept 37's so it's throwing off the traction control system

Upgrades:
Lift/ Height:
-Eibach Coilovers
-4.1" Front lift
-3.8" rear lift
-SPC UCA

Wheels:
-Stock sas wheels
- 37" BFG KO2

Have any luck correcting this issue?

 

[M Redwood]

Greetings!

Question:
Has anyone encountered this issue before? I was looking for either a solution or perspective on how to attack this problem. I've browsed the forums and can only find the tire size reprogram fix. Is there anything else to look out for? Thanks in advance

Story:
We recently lifted a Base 2.3 Bronco to 4"

Issue:
-Traction control kicks on instantly on turn-in in any situation
-Ford service states that its throwing YAW sensor codes

Theories:
-Truck hasn't been programmed to accept 37's so it's throwing off the traction control system

Upgrades:
Lift/ Height:
-Eibach Coilovers
-4.1" Front lift
-3.8" rear lift
-SPC UCA

Wheels:
-Stock sas wheels
- 37" BFG KO2

WAS THIS BASE EQUUIPPED WITH SASQ? AUTO OR MANUAL?

 

[Sparkherd]

Stability control needs to know your speed accurately because that is one of the primary inputs (along with steering wheel angle) into it's internal bicycle model which outputs a target yaw rate which then gets compared to measured yaw rate. That yaw error is what much of the stability control is based off of, and there are lots of checks to try and detect errors coming from the sensors.

Ya, I keep looking for the yaw readout on that pitch and roll thingie on the screen.
As an Aero Injuneer, it makes me sad not to see it...

 

[Love Shop Auto Lo]

Thank you everyone for your input thus far.

We're getting the truck back to our shop next Tuesday.

As for the truck specs:
It's a base with no Sasquatch
automatic

Can warranty be voided if?
1) You use forscan at home and change the tire size?
2) You use SuperChips FlashCal to change tire size?

Last theory I want to get your opinion on:
The truck is getting a lot of body roll over/ side-to-side motion on turns. I want to lessen this issue if not eliminate it as much as possible.

1) is it due to the lift height (4")/ increased center of gravity
2) or am I running incorrect springs?
3) If I lower the the truck to run a 3" lift, will this remedy the body roll over?

Eibach (to my knowledge) only sells one kit with the same springs for both 2 door and 4 door applications. Is there any other kit with different spring rates?

 

[Snacktime]

It has nothing to do with the lift, way to many of us running around on 4" of lift. Zero sensors telling the bronco it's higher. Your fighting something with the tires or steering.

Pull the codes when it comes in.

Fyi I have changed my gear ratios in Forscan from 3.73, 4.46 to 4.71 to see if it changes any of the shift patterns, which it did nothing(no faults either). I would try resetting the tire size up and doing a few relearns on modules. Then drive it around with the off-road screen on see what the steering angle is going straight. I think there might be an issue with steering alignment due to installing upper control arms.

 

[M Redwood]

Im closer to 5 inch lift on base 37s auto no sas no diff drop..used spacers to get front tires away from upper arm on ford +55 offset wheels...no issues...my only thoughts maybe a missed bolt tightening or accidental break or bend on a sensor ..mine holds true going straight . I toed out 2 turns. But no alignment done yet...

 

[Love Shop Auto Lo]

It has nothing to do with the lift, way to many of us running around on 4" of lift. Zero sensors telling the bronco it's higher. Your fighting something with the tires or steering.

Pull the codes when it comes in.

Fyi I have changed my gear ratios in Forscan from 3.73, 4.46 to 4.71 to see if it changes any of the shift patterns, which it did nothing(no faults either). I would try resetting the tire size up and doing a few relearns on modules. Then drive it around with the off-road screen on see what the steering angle is going straight. I think there might be an issue with steering alignment due to installing upper control arms.

That debunks the lift theory. Thank you for the clarification.

To my knowledge the data is being collected from Steering angle+ wheel speed. Along with you, I do not believe height is something the computer considers.

Also great idea on driving with the off-road screen. Very clever to see what the truck is thinking in real time.

Im closer to 5 inch lift on base 37s auto no sas no diff drop..used spacers to get front tires away from upper arm on ford +55 offset wheels...no issues...my only thoughts maybe a missed bolt tightening or accidental break or bend on a sensor ..mine holds true going straight . I toed out 2 turns. But no alignment done yet...

Great point as well. We've had an instance where we accidentally stretched am ABS line on a Lexus GX470 and it throw similar style lights/ errors. Something bent or broken is not out of the realm of possibility.

 

[BryantC]

Any updates for this issue?

 

[drewkam6]

any update on this issue i have the same problem... recalibrated tire size with rough country rc90015 and still present

 

[M Redwood]

Im closer to 5 inch lift on base 37s auto no sas no diff drop..used spacers to get front tires away from upper arm on ford +55 offset wheels...no issues...my only thoughts maybe a missed bolt tightening or accidental break or bend on a sensor ..mine holds true going straight . I toed out 2 turns. But no alignment done yet...

Note--Now that i have some more drive time on my new lift i have activated a fault 3 or 4 times mainly when making a slower turn out of a drive way with some uneven surfaces but its not common and goes away either after turn or if i turn veh off re start...im thinking maybe vehs throwing codes all the time must have sensors slightly out of normal or if sensor mount has any room for play??? since my lift at 5 inches is higher than others???

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