Automatic transmission clunk when stopping - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

snidd111 · 01-11-2015, 04:22 PM

Hey guys,

I saw a lot of posts regarding the manual tranny going from 2nd to 1st when stopping and there being a clunk around 17. But I didn't see much regarding the AT. I had a hard clunk at 9mph when braking. It did it one trip months ago but started up again today after a long drive. Has anyone else had this? It's right at 9mph and it makes the car jerk when breaking. Sometimes it's really hard, sometimes a bit softer.

golfyankee2121 · 01-13-2015, 05:24 PM

I get the same thing sometimes when I am in manual mode, right around that 9 MPH mark. It only happens when I manually shift down from 2-1 though. If I let it shift itself, the jerk is nowhere near as bad.

snidd111 · 01-13-2015, 06:23 PM

Hm ya I get the down shift jerks if I use manual mode. But that seems pretty normal. This feels a lot like with what people are talking about with the manuals entering first gear...but I can't find anything for someone with an automatic.

I realized later every time it's happened I believe a CEL has come on that day...but the CELs gave been different. One was for the cat which had to do with new aftermarket headers. Then 2 codes regarding my tune for vvt. But that shouldn't have to do with the tranny

golfyankee2121 · 01-16-2015, 11:30 AM

Ah I see what you're saying. I misunderstood what you were talking about.

KungFuWaffle · 01-16-2015, 12:07 PM

I've had that same problem but only when the CEL comes on due to the loose gas cap. Someone told me it was on some "limp" mode. Cleared the CEL with torque app and everything is fine now.

snidd111 · 01-16-2015, 01:28 PM

I knew it was going into limp mode I just didn't think limp mode would make it feel like it was breaking itself further

KungFuWaffle · 01-16-2015, 04:19 PM

Quote:

Originally Posted by snidd111

I knew it was going into limp mode I just didn't think limp mode would make it feel like it was breaking itself further

Yea I got scared something was wrong. It happened after installing my muffler delete. But clear the code and it should be fine if you have a CEL

rjgough95 · 01-19-2015, 08:27 AM

Yeah its a type of limp mode I came across it the other month when I went catless.

01-11-2015, 04:22 PM	#1
snidd111 Senior Member Join Date: Jun 2014 Drives: Scion FR-S Location: Virginia Posts: 111 Thanks: 34 Thanked 34 Times in 24 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Automatic transmission clunk when stopping Hey guys, I saw a lot of posts regarding the manual tranny going from 2nd to 1st when stopping and there being a clunk around 17. But I didn't see much regarding the AT. I had a hard clunk at 9mph when braking. It did it one trip months ago but started up again today after a long drive. Has anyone else had this? It's right at 9mph and it makes the car jerk when breaking. Sometimes it's really hard, sometimes a bit softer.

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01-13-2015, 05:24 PM	#2
golfyankee2121 Always Moving Forward Join Date: Jan 2014 Drives: 2013 Argento Scion FR-S Location: Jacksonville, FL Posts: 116 Thanks: 147 Thanked 67 Times in 44 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I get the same thing sometimes when I am in manual mode, right around that 9 MPH mark. It only happens when I manually shift down from 2-1 though. If I let it shift itself, the jerk is nowhere near as bad.

01-13-2015, 06:23 PM	#3
snidd111 Senior Member Join Date: Jun 2014 Drives: Scion FR-S Location: Virginia Posts: 111 Thanks: 34 Thanked 34 Times in 24 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Hm ya I get the down shift jerks if I use manual mode. But that seems pretty normal. This feels a lot like with what people are talking about with the manuals entering first gear...but I can't find anything for someone with an automatic. I realized later every time it's happened I believe a CEL has come on that day...but the CELs gave been different. One was for the cat which had to do with new aftermarket headers. Then 2 codes regarding my tune for vvt. But that shouldn't have to do with the tranny

01-16-2015, 11:30 AM	#4
golfyankee2121 Always Moving Forward Join Date: Jan 2014 Drives: 2013 Argento Scion FR-S Location: Jacksonville, FL Posts: 116 Thanks: 147 Thanked 67 Times in 44 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ah I see what you're saying. I misunderstood what you were talking about.

01-16-2015, 12:07 PM	#5
KungFuWaffle Senior Member Join Date: Jun 2014 Drives: Whiteout Location: Irvine Posts: 564 Thanks: 12 Thanked 106 Times in 85 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	I've had that same problem but only when the CEL comes on due to the loose gas cap. Someone told me it was on some "limp" mode. Cleared the CEL with torque app and everything is fine now.

01-16-2015, 01:28 PM	#6
snidd111 Senior Member Join Date: Jun 2014 Drives: Scion FR-S Location: Virginia Posts: 111 Thanks: 34 Thanked 34 Times in 24 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I knew it was going into limp mode I just didn't think limp mode would make it feel like it was breaking itself further

01-19-2015, 08:27 AM	#8
rjgough95 Member Join Date: Oct 2014 Drives: 13 Subaru BRZ, 02 7.3 F350 Diesel Location: virginia fauquier Posts: 87 Thanks: 19 Thanked 13 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 2 Thread(s)	Yeah its a type of limp mode I came across it the other month when I went catless.

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