wheel spin??

D

DerricksSho

New member
All right guys I need your help? Ive poked around on the internet and have found a few posts similar and one like my problem but then read it and it didn't give a fix.
Ive got a 2013 SHO NON PP the other day AWD off popped up on the dash didnt really think nothing of it. The car since then has turned into a front wheel drive. But not all the time. Ive changed out the fluid in the PTU again thinking maybe that was the case it was dirty. I read on the PP cars that they heat up abd go into a lock mode and show that "AWD off" on the dash. 
 
DerricksSho said:
All right guys I need your help? Ive poked around on the internet and have found a few posts similar and one like my problem but then read it and it didn't give a fix.
Ive got a 2013 SHO NON PP the other day AWD off popped up on the dash didnt really think nothing of it. The car since then has turned into a front wheel drive. But not all the time. Ive changed out the fluid in the PTU again thinking maybe that was the case it was dirty. I read on the PP cars that they heat up abd go into a lock mode and show that "AWD off" on the dash.
Click to expand...
You have any codes?
If you have tourq or a programmer you may be able to log tourqe management for any ideas
Sent from my Pixel 2 XL using Tapatalk
 
no codes.
there has been no grinding or popping that I have heard none of the things people talk about when they mention PTU's.
What is the likelihood of a rear end going bad would it be a hit and miss? 
 
It could be something simple as your wheel speed sensors!
Check and inspect for any corrosion and proceed from there.  Z
 
Do you have forscan?
It can show codes that do not throw a light maybe there is something there.
I think it maybe something weird with the tires whether worn or pressure to high or low then rest or one newer then the rest.

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Here is my very own post from a while back and hoping its something simple as mentioned ^^^. Z

If you can verify that chassis modifications and the tires aren’t at fault monitor the steering angle PID’S in the PSCM and SCCM, the accelerometer PID’S in the ABS module (YAW, LAT, LONG, ROLL) and the WSS PID’S in the ABS module and note for any false readings when this concern occurs. Note it is normal for the steering angle PID’S to not read 0° with the steering wheel straight ahead due to the way that this position is recalculated on each key cycle.
Also note that the accelerometer PID’S will need to be monitored at a standstill immediately after this concern occurs and they should read close to or at 0 with minimal fluctuation (note for difference in reading when this concern is not occurring vs. is occurring). If a faulted steering angle input is found, and depending on where the false input is originating, replace the affected component as needed (EPAS steering gear or SCCM w/ steering angle sensor). If a false accelerometer input is found suspect the RCM is at fault. If a false WSS input is found suspect a WSS/tone ring/wheel bearing issue and repair accordingly.

https://www.ecoboostperformanceforum.com/index.php/topic,6676.0.html . Z
 
Gjkrisa said:
Do you have forscan?
It can show codes that do not throw a light maybe there is something there.
I think it maybe something weird with the tires whether worn or pressure to high or low then rest or one newer then the rest.

Sent from my Pixel 2 XL using Tapatalk
Click to expand...

No I dont have a forscan I should pick one up.
 
I had this same problem when I put front tires that were slightly larger than the rears.

I went to an exact front/rear size and the problem went away.
 
DerricksSho said:
Gjkrisa said:
Do you have forscan?
It can show codes that do not throw a light maybe there is something there.
I think it maybe something weird with the tires whether worn or pressure to high or low then rest or one newer then the rest.

Sent from my Pixel 2 XL using Tapatalk
Click to expand...

No I dont have a forscan I should pick one up.
Click to expand...
Its a program it's main funtion is data reading even a cheap obd reader should work with it as long as it's meant to connect to your phone or computer
http://forscan.org/download.html

Sent from my Pixel 2 XL using Tapatalk

 
had a tire that was off by 8lbs aired them all to 40 did a KAM reset car hasn't went into the FWD mode all day. I did pull up all four wheels on my torque app and they all read different. Does anyone know at what PSI affects your car? you would think there would be a warning light. Im hoping this was it.
 
DerricksSho said:
had a tire that was off by 8lbs aired them all to 40 did a KAM reset car hasn't went into the FWD mode all day. I did pull up all four wheels on my torque app and they all read different. Does anyone know at what PSI affects your car? you would think there would be a warning light. Im hoping this was it.
Click to expand...
Yea 8 ilbs isn't enough to be worried about lossing control but I think it is enough to make the ptu mad. Think 8 is the magic number

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https://one.nhtsa.gov/cars/rules/rulings/TPMSfinalrule.6/TPMSfinalrule.6.html

SUMMARY:� This final rule establishes a new Federal motor vehicle safety standard (FMVSS) requiring installation of a tire pressure monitoring system (TPMS) capable of detecting when one or more of a vehicle's tires is significantly under-inflated. This final rule responds to a mandate in the Transportation Recall Enhancement, Accountability, and Documentation (TREAD) Act. This final rule requires installation in all new light vehicles of a TPMS capable of detecting when one or more of the vehicle's tires, up to all four tires, is 25 percent or more below the manufacturer's recommended inflation pressure (placard pressure) or a minimum activation pressure specified in the standard, whichever is higher.

DATES:

Effective Date:� This final rule is effective April 8, 2005, except for Subpart G of 49 CFR Part 585, which is effective September 1, 2005.
Compliance Date:� Consistent with the phase-in commencing October 5, 2005, all new light vehicles must be equipped with a TPMS that meets the requirements of the standard by September 1, 2007, with the following exceptions. Vehicle manufacturers need not meet the standard's requirements for the TPMS malfunction indicator and related owner's manual language until September 1, 2007 (i.e., at the end of the phase-in), and vehicles produced by final-stage manufacturers and alterers must be equipped with a compliant TPMS (including a malfunction indicator) by September 1, 2008. However, manufacturers may voluntarily certify vehicles to FMVSS No. 138 and earn carry-forward credits for compliant vehicles, produced in excess of the phase-in requirements, that are manufactured between April 8, 2005, and the conclusion of the phase-in.
Click to expand...
 
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