[platii]

I also checked for voltage fluctuations when the malfunction occurs the voltage does not fluctuate at all.

By doing this way you just monitored the system voltage, what you need to monitor is voltage fluctuation at the servotronic sensor itself, access the KGM control unit and navigate to servotronic live data and see what happen to the sensor voltage when the malfunction occurs. May be wiggle the wiring and check.
If not the wiring could be the sensor on the steering rack. Could you access the 93C1 fault to see the details to troubleshoot it better. Could be the sensor has intermittent failure.
It is advised also to access other faults after a deletion and see if it help understand what's going on or if related.

 

[platii]

When I look up the code 93C1 for BMW it comes up with an airbag restraint. But my scanner is saying it’s a Servtronic hardware faulty

NO, fault 93C1 is the correct fault code for servotronic on this platform. Many information on the internet or other forums are not compatible here.

When I try to access the KGM module on the scanner it tells me the ECU could not be read.

Get another BMW scanner to confirm the accessibility. Try INPA. Also disconnect the servotronic sensor connector and try to access KGM again.

I also get the codes A0C1, A559, along with 93C1.

Could get details if you navigate the fault in this scanner, we need the details.
Does these fault trigger together, delete the faults and test. This will tell us if the sensor is bad or something else cause the issue.

 

[platii]

You are accessing the wrong modules.
You need to access the KGM module to show the live data of the servotronic sensor and the fault details. You need to choose BODY from INPA left menu then I think one of the 2 most bottom modules is the KGM on the right menu.
For the other faults you listed you need to access CAS "Car access system" also under body.

The car did this to me one time when I first bought it 2 years ago, I shut it off started back up and it never came back again

Did what exactly? servotronic failure?.

 

[platii]

Hmm, this would indicate replacing the sensor may not solve the issue. The search now is to find out if the system power interrupts the sensor operation to isolate the issue at the sensor or the steering rack.

 

[platii]

There is only one sensor on the rack and pinion right?

No.
Bring the code detail and monitor the KGM to have better idea.

 

[platii]

yes means no other sensor other than what we are talking about.

 

[platii]

OK we lost the evidence by deleting, wait until it comes up again.
Delete this INPA and download INPA (BMW Standard Tool) it comes with an installer from bimmergeek.com, this one is missing some files. You should access the KGM but missing its file.ipo. You need to access to see the details of the fault and diagnose better.

 

[platii]

Yeah do that. I think the KGM has a history memory so we can retrieve the fault detail from there once you access it unless you deleted the history memory too.

 

[platii]

No it doesn't reflect the mechanical turn angle. The steering angel sensor measure the steering wheel rotation degree of 440 to the right and 440 to the left which equal to 2 turn and 1/3 from lock to lock, the wheel and tire turn 45 degree approximately in response.

I don't think the system uses the steering angle sensor to test plausibility in term of servotronic, this evaluation check doesn't exist simply because there is no fault code for it. The code in this case is hardware failure and this can be caused by electrical or power issue or failed control unit internal circuitry (KGM). In addition, there is no feed back signal from the steering hydraulic flow, servo sensor or the steering mechanical angle, the steering angle sensor signal doesn't reflect the actual mechanical turn angle. The car system (DSC) will accept steering wheel deviation during the calibration process up to certain degree. In other word, if you disconnect the steering shaft from the rack input shaft and turned the steering wheel and tried to calibrate the steering sensor the system will take it.

 

[platii]

Interesting if it's related, what was the steering sensor reading before the reset?. I am sure the servotronic is a speed dependent but all is possible since it was hard fault and no more fault now.

When I purchased my car the steering angle sensor was all over the place with 3 faults and DSC related fault and never trigger the servotronic, sorry but hope it is fix for you.

 

[platii]

As per the OP the fix is to do the steering angle sensor adjustment. Try and report back here.

 

[platii]

Explain your symptoms, show fault codes, what is that doesn't work and?. Show picture, print screen, etc...