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Hi,
When I stop my car, I hear a single knock noise. Is this expected? I have usually engaged the parking brake and also have it in Park when I turn it off and at that moment when I hit the start/stop, a single knock I can hear.
Thanks!
 

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Can you record it? Sometimes, the Evap System may make a knock sound, but, there's so many other possibilities...
 

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2020 Subaru ascent premium 2003 Jeep Wrangler freedom edition
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2020 CWP Touring
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When I stop my car, I hear a single knock noise. Is this expected? I have usually engaged the parking brake and also have it in Park when I turn it off and at that moment when I hit the start/stop, a single knock I can hear. Thanks!
Ours makes an audible "click" or "snick" sound from the engine area 1-2 seconds after the engine turns off. I think this could be:
  • electronic throttle's butterfly resetting itself
  • tumble generator valves in the intake manifold resetting themselves
  • camshaft phasers resetting themselves
  • turbocharger's wastegate resetting itself
There is good number of electronically actuated components under the hood, any one of which could be readjusting or resetting just after shutdown.
 

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And then, inside, is the shift solenoid mechanism.
 
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