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Help with Power Steering issue


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4 replies to this topic

#1 OFFLINE   raadsel

raadsel

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Posted 29 April 2017 - 08:42 AM

A couple of days ago I had been running errands. My last stop, very close to home, when I turned the car back on I got a Power Steering Failure message and it was extremely hard to turn the wheel. I drove home and made it okay. Once parked, I decided to try and restart my car and I didn't get the message, and the wheels turned easily -- my power steering was working okay. 

 

I decided to head to my Ford dealer and see if they might know anything or have any suggestions. I got the Service Adviser to check for any codes, and there weren't any.

 

I did quite a bit more driving Thursday, did some driving yesterday, and have had no further issues -- everything has been working fine. I'm just curious if anyone else has had this happen, or if you have any suggestions.









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#2 OFFLINE   SnowStorm

SnowStorm

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Posted 29 April 2017 - 08:39 PM

Several times I have turned on the car and started to turn the wheel but the power steering was obviously not "powering".  It has always started working in just a second or two so I've never given it much thought.  I have never seen any warnings.



#3 OFFLINE   Plus 3 Golfer

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Posted 29 April 2017 - 09:43 PM

I recall at least one time I had a similar experience as SnowStorm.

 

From the manual, the Power Steering Control Module (PSCM) needs the power mode signal from the Body Control Module for Electronic Power Assist Steering (EPAS) to be activated.  So, any delay or error in getting the signal might be the cause of the few second delay in EPAS activation.

 

Once active, EPAS uses the steering torque sensor input and vehicle speed in applying steering assist.  "The steering torque sensor senses the torque at the steering wheel. It is hard wired to the PSCM and works by measuring the relative rotation between an input and output shaft which are connected by a torsion bar."

 

"The PSCM is self-monitoring and is capable of setting and storing Diagnostic Trouble Codes (DTCs). Depending on the DTC set, the PSCM may enter a failure mode. In addition, the PSCM may send a request to the IPC to display a message in the message center, alerting the driver of a potential EPAS concern."

 

Depending on the DTC, the PSCM failure modes are 1) diminished EPAS and 2) no EPAS or manual steering.

 

So, my guess is that upon restart the issue causing the failure mode was no longer present and EPAS operation returned to normal and the DTC was reset.  It seems that a CAN issue, PSCM issue, or an issue with the steering torque sensor could initiate a failure mode.



#4 OFFLINE   jestevens

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Posted 01 May 2017 - 06:52 AM

I had an HHR where they had a batch of substandard electric power steering motors from Delco that finally went out completely under extremely hot conditions driving around one weekend, and you're right, it was amazingly hard to turn because the car was obviously built with power steering in mind.

 

Apparently GM had done a recall of Cobalt power steering motors in the US and HHR power steering motors in Canada but no HHR power steering motor recall in US.  Eventually they did cover the cost of the repair and then mysteriously shortly thereafter my thermostat was stuck and to fix it cost about the same as a power steering motor repair job..

 

Luckily no such problem with the CMAX yet, it's almost eerie - 10,000 mi intervals of visiting the service shop..



#5 OFFLINE   raadsel

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Posted 01 May 2017 - 12:22 PM

It was scary for me, at the time, as I was afraid I was going to have an expensive repair. Fortunately, it still hasn't recurred. I'm hoping, like Plus 3 Golfer referred to, it was just a module that didn't start up correctly which caused the power steering "not to turn on." I'll be keeping a watch on it and hopefully it was just a one off.








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