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Old 10-07-2012, 09:18 AM   #76
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My RX350 has hill hold assist. However, you have to activate it yourself by pushing the brake pedal extra hard while stopped. The car will beep and the hill hold light will start flashing on the dash. These functions should not be automatic.
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Old 10-07-2012, 12:40 PM   #77
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You have to actively push a button down on the lower left side of the dash of my wife's Subie in order to turn that one on.


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Old 10-11-2012, 11:05 AM   #78
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I also do not like this feature. I had it on several Subies in the mid 80's but it seemed to release the brakes as I engaged the clutch. The camaro is definitely not doing that- or releasing with accel. I have stalled multiple times- defeating the purpose of the feature. I have learned to not put it in gear while the brake is on, similar to what Rockamakis is doing above. This needs to be addressed by GM. I still love this car, though.
I apologize for the dissatisfaction you have with this feature. I will definitely put this into our database where many departments of GM can access the information. Please let us know if you have any other questions!

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Old 10-11-2012, 12:04 PM   #79
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Whats the difference in this system compared to others? Had a 335 with it that functioned automatically and worked without issue for the 3yrs we had it. Yeah there a few molehills here believe it or not.
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Old 10-11-2012, 12:08 PM   #80
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I don't stall when it engages, but it certainly puts more wear on the clutch. I get a little jerk when the brake disengages as well. I wish there was a way to disable it.
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Old 10-11-2012, 01:00 PM   #81
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Whats the difference in this system compared to others? Had a 335 with it that functioned automatically and worked without issue for the 3yrs we had it. Yeah there a few molehills here believe it or not.
What I've read here indicates that its timing may not match that of a driver who is reasonably proficient at manual transmission operation all that well.

It may be something that's subject to some tolerance, with some individual cars being worse than others about getting in the driver's way. Or perhaps not being compatible with the use of only minimal throttle to get rolling.


I don't think it's just the Camaro or just Chevy. Any sort of electrical or electronic brake release feature is subject to not working well with at least some drivers. Although the system details likely differ, the hill assist feature in my wife's Subie is decidedly lazy in letting go. And after driving stick-shift cars for nearly 50 years I've managed on several occasions to stall that car when the [related] electronic parking brake refused to release the brakes as fast as I was adding clutch engagement just to get out of my driveway.


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Old 10-11-2012, 01:38 PM   #82
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...Now I find that I have to remember to wait until the car just starts to roll back before I can take off. Why is this an improvement over what we have always had?
The Nissan 370Z has a button to press so when you shift gears, a computer moves the engine RPM to match whatever the Clutch disk rpm is after the shift lever is moved to any gear.

this way, when you shift there is no lurching or jerking.

this way, you do not have to use your brain to blip the throttle and match the revs yourself.

I think this is an "improvement" but only if you can't drive.
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Old 10-11-2012, 02:44 PM   #83
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What I've read here indicates that its timing may not match that of a driver who is reasonably proficient at manual transmission operation all that well.

It may be something that's subject to some tolerance, with some individual cars being worse than others about getting in the driver's way. Or perhaps not being compatible with the use of only minimal throttle to get rolling.
Thanks.
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Old 10-11-2012, 08:47 PM   #84
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Learn to use all 4 limbs on a hill and you don't have any problems.

Left hand on steering wheel
Right hand on emergency brakes
Left leg feathering the clutch
Right leg modulating the throttle

There are quite a few 50+ degree incline in San Francisco and it never fails me. The only thing that I hate are retards that RIDE YOUR ASS CLOSE on a hill.
This made me laugh, I had an '01 manual Z28, and driving around Willimantic and Waterbury in CT plenty of hills to worry about - wow, I never realized it until now but back then I was using this same "four limb" method
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Old 10-12-2012, 12:54 PM   #85
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A step back in my opinion. I've only had the car three days but I do NOT like this feature. I haven't stalled a manual car on a hill in over 20 years, but I've stalled this one half a dozen times. If anyone can figure out how to turn this feature off I'd love to know.
Same here.

I have learned you can defeat it by pulling up on the handbrake as if you don't have Hill Start Assist. Otherwise you have to slip the clutch longer than normal to avoid stalling the engine.

The duration of holding the brakes is too long IMO, and I would like to be able to turn it off. Having said that I generally agree the feature is useful.
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Old 10-12-2012, 02:20 PM   #86
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I found this on the Mustang forum and also same on a Jeep forum. Could be that GM is using the same component. I am trying this later:

http://www.teamshelby.com/forums/ind...0#entry1313180

Notice it also says it can be turned off by turning off the Advanced Track. Maybe if we turn off Stabilitrak it will also disable HSA when not desired.

Last edited by wakespeak; 10-12-2012 at 02:24 PM. Reason: Stabilitrak comment.
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Old 10-12-2012, 03:54 PM   #87
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I'm pretty sure that disabling Stabilitrak was mentioned earlier in this thread, though it didn't seem to attract further discussion at the time. Let us know how it turns out.


It does make sense to piggyback hill-assist on top of whatever stability control system is already in place, as stability control requires at least one inertia sensor. Adding another one to detect significant longitudinal slope into the same little box, another wire or three, and a few more lines of code shouldn't be difficult.

The real gem in that linked thread is that there's hope that a way to reset the default to 'off' exists.


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Old 10-16-2012, 10:51 AM   #88
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Disabling Stabilitrak ("Competition Mode") did not turn off HSA. Have not tried the elaborate disabling feature mentioned in the Ford link, but I am doubtful because the Ford and Jeep procedures, while similar, are different.

Edit: dealer says HSA cannot be turned off.

Last edited by wakespeak; 10-16-2012 at 12:28 PM. Reason: dealer info
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Old 12-18-2012, 01:29 AM   #89
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I"m so glad I found this thread. I was beginning to think I was jinxed.

Brought my '13 Dusk SS M6 home today and did a lot of driving around. Leaving my neighborhood three times I stalled. Couldn't for the life of me figure out what was going on. It was like the car just wouldn't go. The same every time.
Its a very slight hill so I guess I'm just getting on it so quick I'm not leaving enough time for the brakes to disengage and I'm not giving enough throttle to overcome it.

Phew. Was worried for a second. This restores faith in myself
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Old 12-18-2012, 07:28 AM   #90
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Edit: dealer says HSA cannot be turned off.
I'd bet if you could find the wires that transmit car inclination information to the BCM or whatever computer sets the HA, you could turn it off either permanently or switchably so. Naturally, the dealer can't/won't tell you that, because it wouldn't be a "by the book" procedure.

The aftermarket tunes that people don't worry much about installing aren't "by the book" either . . .


Thanks and a tip of the hat to Dupree for prodding a little thought this morning.


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Old 12-18-2012, 09:42 AM   #91
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Studebaker had hill assist that worked well.
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Old 12-18-2012, 11:44 AM   #92
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My 83 Subaru had it. Awesome stuff, I'm surprised more cars don't have them. I've driven manuals since 1972, so it's not like I have a problem on hills, but that hill brake was a cool deal regardless.
When I was a kid, our '51 Studebaker had a "hill holder" that served the same purpose. It was a braking mechanism that released as soon as the clutch hit the friction point. Studebaker introduced the Hill Hold in 1936. Those cars were so advanced on things like this... people couldn't relate to them and shied away from the new-fangled gadgets, and didn't buy enough of them to stay in business (Studebaker's last year was 1966).

The '51 looked a lot like this:
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Old 12-18-2012, 12:44 PM   #93
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Yeah I'm not too impressed with it either. I have just about killed it a couple of times while waiting for the assist to disengage. Might be nice for a novice but definitely BS if you know what you are doing.
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Old 12-18-2012, 01:02 PM   #94
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Yeah I'm not too impressed with it either. I have just about killed it a couple of times while waiting for the assist to disengage. Might be nice for a novice but definitely BS if you know what you are doing.
It can't be disabled?
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Old 12-18-2012, 05:04 PM   #95
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It can't be disabled?
So far nobody has figured out how to disable it. I remain hopeful that someone will do so soon.
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Old 12-18-2012, 08:27 PM   #96
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To me it sounds like the system is not working correctly and may be a good contribution to early clutch failure. GM should relook at the programming.
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Old 12-18-2012, 10:22 PM   #97
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My 83 Subaru had it. Awesome stuff, I'm surprised more cars don't have them. I've driven manuals since 1972, so it's not like I have a problem on hills, but that hill brake was a cool deal regardless.
This thing sucks!!!!!!! it is going to destroy my clutch trying to back into my garage.Since i have to stop to make sure i have clearance so i dont hit anything,it wont release.Those of us who know how to drive dont need crap like this.
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Old 12-18-2012, 10:52 PM   #98
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Works fine for me during the 2 weeks I've owned mine. I actually like it; especially when the bozo behind me on the hill thinks they have to get right on my bumper cuz they're in such a hurry.....
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Old 12-18-2012, 11:15 PM   #99
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Have been driving stick for only 2 years and I'm a master at hills. I don't need this hill start thing, hell I don't even know how it works. Also i have yet to even stall my camaro In my one week of owning it.
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Old 12-19-2012, 08:52 AM   #100
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Hate it. I never stall on hills. I've stalled twice with this thing.
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