Power steering failure
Last edited by 3X2; Apr 16, 2019 at 12:16 PM.
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All I can find from a moving ship in the South China Sea is the following in a google search:
“General Motors is recalling 26,772 cars because their electric power-steering system could fail, making it harder to steer and control the vehicle. The recall affects the 2017 Cadillac ATS, 2016-2018 Cadillac CTS, 2017 Chevrolet Camaro and 2017 Corvette.
GM says the problem stems from defective control boards for the Bosch-supplied electric power-steering system. If the system fails, GM says that drivers will get an audible and visual warning about the error in the car's instrument cluster. Sometimes the problem will go away when the car is restarted.
The good news is that even with the power-assist function down, the cars' steering will still work, so you would still be able to steer. Still, GM cautions that high steering effort could make it tougher for owners to drive the affected cars safely, especially at lower speeds, such as in urban areas and parking lots. Although in the case of a Camaro or Corvette, losing power assistance on a race track could be really problematic.”
I can add that this is not the first time it’s been reported on the Forum. It has occurred before and several times dealers did not find a tripped CEL after it corrected itself. When the failure was duplicated the solution was a new complete assembly. That includes the rack.
From forum posts and looking up a my ~May built 2017 GS it was not part of the recall. As I recall it was some cars built in the ~fourth quarter of 2016.
PS: Can only assume it’s a dispute between Bosch and GM re cause. Otherwise per typical vendor purchase contracts Bosch would send 27,000 new assemblies and pay all costs for the install. Not cheap but better than if someone is badly injured making a turn when the failure occurred. If the assembly is not repairable by a dealer as a minimum would think Bosch would have sent some new units and brought removed ones to their facility and made repairs so they could be put in stock.
I can hear the prosecuting attorney now: “Let me understand GM, you had new good units available to replace the known defective ones BUT it was more important to you to make new cars for the profit than to replace my clients steering assembly!”
Last edited by JerryU; Apr 16, 2019 at 04:17 PM.
Pure speculation as to possible cause and possible controversy between GM and Bosch, which I don’t know even exists.
But as I posted previously (see posted pic below) and since you say you are “building race/track cars,” be sure you can’t be accused of causing the issue!
When installing a “Catch Can” looked at the three ground locations GM used close to each other. The “Can” manufacturer install instructions said to remove one and put their anodized aluminum bracket on that frame location and bolt the ground back on top. Knew the electric power steering was in that area and the ground wires are large so designed to carry high current and wondered if that one could the steering ground.
Since I wired my ProStreet Rod from scratch and was carful to select the right size wires (like the one from the right rear mounted battery to the 502 cid engine starter) my solution was to put only the bracket in that location and move the ground to one located close to it so I was not adding resistance. Also makes it easier to remove the “Can” for cleaning from the stud I used to replace that bolt.
Subsequently found in a transient maneuver the electric power steering can draw over 100 amps. If the system cannot assist in a turn as quickly as commanded it may shut down! Also found our BMW SUV, which has two batteries (for energy saving reasons) puts both 12 volt batteries in series only for it’s electric steering. That means half the current draw so less likely an excess current or a poor battery cable connection could cause a tripping problem. Does it mean a weak battery could be a contributor?
As I said, not sure if grounding in this location has anything to do with the problem but if you are “messing” with anything in the electric system I would be cautious. Just saying you’re “building” cars (by modifying a stock car) could be a risk!
Reminds me of the words I use in my consulting, I only make “Recommendations” in a formal written report for which I’m paid. For all free advice I only make. “Suggestions.”

Last edited by JerryU; Apr 16, 2019 at 05:15 PM.
But who knows.



















