# Infiniti - 2009 G37x - Slams into 1st gear from 2nd...Sometimes **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** g37, infiniti\ **Created:** [January 3, 2011, 6:21pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472 "2011-01-03T18:21:24Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![joswald21](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joswald21/32/1441_2.png) [@joswald21](https://community.cartalk.com/u/joswald21)\ **Post date:** [January 3, 2011, 6:21pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/1 "2011-01-03T18:21:24Z")
Here’s the scenario. From a cold start, I drive at 30 - 40 MPH for about 1/2 mile to a RED traffic. As I gradually break, the light is long so there’s no hurry to get to it, the car downshifts normally in it’s cool G37x-downshifting-kind-of-way. BUT, when it shifts from 2nd to 1st, it SLAMS into 1st gear with a loud BANG that is somewhat unsettling. This event has happened to me three (3) times - once with my wife as a passenger. It has never happened to her while she was driving. Has anyone else had the same experience? ---
**Author:** ![Bladecutter](https://avatars.discourse-cdn.com/v4/letter/b/aeb1de/32.png) [@Bladecutter](https://community.cartalk.com/u/Bladecutter)\ **Post date:** [January 4, 2011, 5:27pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/2 "2011-01-04T17:27:58Z")
Well, have you checked the transmissions fluid level? BC. ---
**Author:** ![joswald21](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joswald21/32/1441_2.png) [@joswald21](https://community.cartalk.com/u/joswald21)\ **Post date:** [January 24, 2011, 3:47pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/3 "2011-01-24T15:47:08Z")
Yes. ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [January 24, 2011, 3:50pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/4 "2011-01-24T15:50:24Z")
A 2009 - seems likely that it is still under warranty. A good transmission tech should get it on a scanner. If its under warranty, take it to the dealer. If not, find your best local, independent transmission shop. ---
**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\ **Post date:** [January 24, 2011, 7:05pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/5 "2011-01-24T19:05:58Z")
How about a look at TSB’s? Transmission “events” usually makes their way there. ---
**Author:** ![joswald21](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joswald21/32/1441_2.png) [@joswald21](https://community.cartalk.com/u/joswald21)\ **Post date:** [February 28, 2011, 4:50pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/6 "2011-02-28T16:50:00Z")
I spoke to Service at the dealer and he said he didn’t know anthing about the problem. I’m going to post on the Infiniti and G37 forums as well. ---
**Author:** ![common-sense-answer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/common-sense-answer/32/716_2.png) [@common-sense-answer](https://community.cartalk.com/u/common-sense-answer)\ **Post date:** [February 28, 2011, 5:55pm UTC](https://community.cartalk.com/t/infiniti-2009-g37x-slams-into-1st-gear-from-2nd-sometimes/59472/7 "2011-02-28T17:55:33Z")
7-Speed ? A Nissan Technical Service Bulletin For 09 Infiniti FX35, G37, And M35 Models With 7 Speed A/T Only, Discusses Harsh Downshifts, But It’s A Harsh Fourth Gear To Third Gear Downshift. For a harsh 4th to 3rd downshift, while coasting at 30 - 20 MPH with closed throttle, the Nissan bulletin written for Infiniti technicians, gives the procedure for reprogramming the TCM. I don’t see anything for a 2nd to 1st problem.