Here's a new one...Start Button Fault - McLaren Life
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post #1 of 8 Old 03-20-2017, 12:58 PM Thread Starter
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Here's a new one...Start Button Fault

Spent the day at COTA turning several tanks of fuel into brake dust and tire shavings.

At the end of the day, after last session was complete, stopped on pit lane to pack up my stuff. Car would not restart. Message on display was

Start Button Fault - Call McLaren Service Center

Windows were down and ebrake was on. Car was VERY hot, having just come off of track on a high 80-degree day. Center console was also very hot, with the sun directly on it.

Tried lots of ways to reset it. Walk away/sleep/reawaken...OBD scan tool Reset All Codes...disconnect/reconnect battery...no dice. Thought I was going to have to leave the car on pit lane overnight with the windows down.

Texts to service personnel at both Houston and Philly (Thanks for the weekend support, guys!) revealed "never seen that one before".

Eventually was able to get the windows up by repeatedly pushing the Start button while holding the window switch up. Didn't work on the ebrake, though.

Finally was able to power-up by sitting in car with both doors closed, and then locking/unlocking. That reset something and the car started. Drove it to garage, turned off and tried to restart. Fault reappeared. Was able to repeat the lock/unlock sequence to start again, but clearly something is amiss.

Anybody ever seen this one before?
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post #2 of 8 Old 03-20-2017, 05:56 PM
 
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Luckily it wasn't a "stop" button fault.

In all seriousness, I have ran across "hot start" issues in Porsche 944s and the problem was the starter itself, but it seems that in your case you had trouble even turning the key on, right?

Never ran across this on the McLaren, but then again, I haven't tracked it in hot and humid TX.
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post #3 of 8 Old 03-20-2017, 06:15 PM
 
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I had a similar issue a few weeks ago in my 650... service manager said to hold down brake "hard" and HOLD start button ... that did the trick... and the issue hasn't sprung up since.... (knocking on wood)

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post #4 of 8 Old 03-20-2017, 08:42 PM Thread Starter
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Overnight stay in a cool garage and it works as designed again.

So it basically overheated. Texting with a tech at PhillyMac says that all those switches in the pod are a single serviceable electronic unit, not individual assemblies.

I'm going to sit the car out in the sun later this week and see if the problem reappears. I'm also going to carry a can of electrician's freeze spray in the car for awhile...
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post #5 of 8 Old 03-20-2017, 08:51 PM
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That's a new one to me. And I've left the car sitting in BROILING desert sun all across the country, 114 in savanah, 117 near death valley. For hours. Interesting, I wonder what's going on that rattling the other switches gets it to work.

Thanks for sharing the experience, please let us know if you figure out anything further.
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post #6 of 8 Old 04-02-2017, 03:44 PM Thread Starter
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Update...does not appear to be heat-related as it happened again this am on first attempted start when the car was cool. Also happened yesterday at the end of a track day, repeating the COTA episode. But only briefly this time.

We pulled codes on Friday at the dealership and found both a Start button fault and a neutral switch fault. The latter may actually be the root cause, as you can't start the car unless it thinks you are in neutral.

Car will be visiting the service dept this week for further diag. Stay tuned...
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post #7 of 8 Old 04-05-2017, 11:30 PM
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Quote:
Originally Posted by str8blst View Post
I had a similar issue a few weeks ago in my 650... service manager said to hold down brake "hard" and HOLD start button ... that did the trick... and the issue hasn't sprung up since.... (knocking on wood)
Had a similar issue, nothing heat related, just wouldn't start, and this did the job for me as well.
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post #8 of 8 Old 04-06-2017, 11:16 AM Thread Starter
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Quote:
Originally Posted by McLarenguy28 View Post
Had a similar issue, nothing heat related, just wouldn't start, and this did the job for me as well.
Did either of you actually get a "Start Button Fault" message on the left hand display?

Or did the car simply not start when the button was pushed?
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