2012 Transmission Clunk/Lunge - Acura MDX Forum : Acura MDX SUV Forums
LinkBack Thread Tools Rate Thread
post #1 of 7 (permalink) Old 11-22-2012, 12:25 PM Thread Starter
Registered User
Join Date: Sep 2012
Posts: 7
2012 Transmission Clunk/Lunge

Pretty new user to this site as we purchased our base-model 2012 in late September. I'm not sure if there's an issue with our transmission, but I hear a clunk and about a 1 second lag in forward movement after using the parking break on our sloped driveway.

We usually park our vehicles in the garage, but on the occasion when I park in the driveway I set the parking brake with the vehicle in D, then with my foot still on the break shift to P. When I'm ready to move the vehicle into the garage I reverse the process - shift from P to D, then with my foot still on the break I release the parking brake. I read that this is the order the process should be done in from an older Honda/Acura owner's manual online.

After I shift to D and release the parking break to pull the vehicle into the garage, I hear a clunk noise and there's about a 1 second lag before the vehicle moves forward - almost a sort of lunge. Is this an issue I should be concerned with/have inspected or a normal occurrence?

Thanks for your help.

desmonsm is offline  
Sponsored Links
post #2 of 7 (permalink) Old 11-22-2012, 03:06 PM
Registered User
Join Date: Nov 2012
Posts: 65
That clunk noise is probably the brakes releasing from the rotors. Our cars have hill assist which is why you're feeling the lag, it prevents the car from rolling back. Good for steep hills, but you get used to it on your driveway and smaller inclines to wait a sec and it will release.
blingman is offline  
post #3 of 7 (permalink) Old 11-23-2012, 11:24 AM
Registered User
Tsturbo's Avatar
Join Date: Jul 2011
Location: Western WA State
Posts: 304
Or pop it into reverse, then into drive and your good to go. It is the hill start assist.

2011 MDX Advance
Palladium Metallic

2015 GMC SLT-1 4WD
Tsturbo is offline  
post #4 of 7 (permalink) Old 11-23-2012, 05:39 PM
Registered User
Join Date: Dec 2010
Location: Galveston, TX
Posts: 1,048
The hill start assist mode is one of my favorites options in the Acura. It really comes handy very often whenever you are stopped in a slope of any kind.

The noise most likely comes from the brake pads snapping back to place after the assist mode applies the brakes to avoid going backwards and then going forward after accelerating. I will assume the noise will occur more often, or more noticeable, when the pads are worn or at it's middle life.


2011 Pearl White MDX Advanced
... OEM towing, 20 mm wheel adapters,
... rails/crossbars, black wheel well trims,
... side windows acrylic deflectors,
... Michelin Latitude Diamaris HP 285/45R19,
... Full size spare tire,
... 6000 Kelvin HID's
2010 Acura TL Tech.
2001 Mercedes ML 320
2005 Mercedes ML 500 AMG Package
AC_MDX is offline  
post #5 of 7 (permalink) Old 11-23-2012, 05:50 PM
Registered User
Join Date: Aug 2012
Posts: 1,320
I've noticed it's a bit abrupt when it releases, but does a decent job. I've started just waiting until the brakes release on their own and then I get on the gas. My Challenger SRT8 has this but with a manual transmission and it will hold until it senses forward motion....so you can sit forever on a hill with the clutch in or in neutral. I like that better but it's a much bigger deal in a manual than an auto.

'12 MDX Tech
skinny2 is offline  
post #6 of 7 (permalink) Old 11-24-2012, 05:37 PM
Registered User
TheJimbo's Avatar
Join Date: May 2012
Location: NY
Posts: 156
Odd. I've been on plenty of hills over the last 7 months of ownership and there has neither been lurching nor clunking when hill assist disengages. It's all smooth.

"The only thing necessary for the triumph of evil is for good men to do nothing."

2012 Acura MDX Tech
Bali Blue/Taupe
Body side molding
Chrome side steps
Cargo cover
Wood grain shift knob
OEM hitch/wiring harness
TheJimbo is offline  
post #7 of 7 (permalink) Old 11-26-2012, 03:23 PM
Super Senior Member

Fabvsix's Avatar
Join Date: Aug 2003
Location: NorCal
Posts: 4,969
When you park on a hill make sure when you stop to put the vehicle in "neutral" apply emergency brake, let is roll against brake as opposed to transmission, then put in park thus avoiding the "CLUNK" noise you are describing.....

CURRENT VEHICLES, NOT previous ones!
2004 RL Navi/Blk/Ebony
2007 RDX Tech package/Pearl White/Ebony
2007 MDX Sport/Ent. Black/Ebony

2006 Lucchese Classics Black/Cherry Nile Crocodile belly, upper Black US Buffalo

** Converted to Zaino on 06-12-2002 **
Fabvsix is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Acura MDX Forum : Acura MDX SUV Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome