Does anyone have thoughts on error codes P2637 and P0700? My automatic transmission downshifts really hard. Almost like I am slamming on the brakes. And it jars forward in my seat. The SES light has disappeared now, and I took it to the dealership. But they say they can't duplicate it.
Honestly, I don't know why they just won't replace or fix whatever the problem is. But I was wondering if anyone else had this issue and what had been done to fix it.
I'm getting:
P0700 Transmission Control System (MIL Request) Malfunction
Location: Under an invisibility cloak, somewhere in the Northeast
Quote:
Originally Posted by 66cat389
Does anyone have thoughts on error codes P2637 and P0700? My automatic transmission downshifts really hard. Almost like I am slamming on the brakes. And it jars forward in my seat. The SES light has disappeared now, and I took it to the dealership. But they say they can't duplicate it.
Honestly, I don't know why they just won't replace or fix whatever the problem is. But I was wondering if anyone else had this issue and what had been done to fix it.
I'm getting:
P0700 Transmission Control System (MIL Request) Malfunction
and
P2637 Torque Management Feedback Signal “A”
First off, ignore the P0700. That code means that the transmission control module asked for the MIL (SES) light ot be turned on.
When the P2637 code is set the transmission will change operation.
Quote:
Action Taken When the DTC Sets
• The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
• The TCM turns off the pressure control solenoid. When the pressure control solenoid is off, line pressure is at maximum.
• The TCM freezes transmission adaptive functions.
• The TCM inhibits Autograde braking and shift stabilization.
• At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
• At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
• The TCM stores DTC P2637 in TCM history.
So that will give you the bad behavior you noted.
Is the transmission still acting up after the dealership looked at it?
The diagnostic procedure for P2637 looks fairly simple. Clear the code and see if it returns. If it does replace the TCM. If it doesn't check for loose wire and return it.
From your basic story line, that appears to be what happened.
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Any GM Solstice Service Manual and Service Bulletin information found here on site, or Sales and Product information should be thought of as correct and accurate as of the date posted. After that any information or procedure should be confirmed as still correct with your dealership.
First off, ignore the P0700. That code means that the transmission control module asked for the MIL (SES) light ot be turned on.
When the P2637 code is set the transmission will change operation.
So that will give you the bad behavior you noted.
Is the transmission still acting up after the dealership looked at it?
The diagnostic procedure for P2637 looks fairly simple. Clear the code and see if it returns. If it does replace the TCM. If it doesn't check for loose wire and return it.
From your basic story line, that appears to be what happened.
May be why they couldn't duplicate it. if they cleared the codes before driving it sounds like it would take two instances to trigger it again. Question now is how do you get it to stop triggering it.
Thanks for the input S.D.
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Last edited by Gunnys GXP : 04-23-2008 at 12:11 PM.
Well, the dealership cleared the codes and they cannot duplicate it. It happened between 5 and 10mph, fairly consistently. And the MIL was on until I let it sit overnight and took it into the dealership the next day. Then it was off.
I told Customer Service at Pontiac what codes I was getting and they said that my Scanner wasn't calibrated to the Solstice, since the dealership was nice enough to print the codes they got on my receipt, I'll have to call B.S. on their statement. They got the same exact codes.
My main fear is that because it acts like it's braking when this happens and with no brake lights to signify that I am stopping quickly I'll get rear ended. People ride too closely to our cars as it is.
I think I will inspect the wires myself tonight, thankfully I have a pit in my garage so getting under the car is a breeze.
You would think they would just replace the TCM or at least inspect the wires.
The same thing happens with the automatic tranny in my car...seems to bang back down to a lower gear and slow speeds...kinda like when I am driving from stop sign to stop sign. It pushes me in my seat. When you find out what it is, please let me know...as my dealer has stated that "this is within normal GM specifications." I haven't gotten any codes though, but it bangs really hard to the lower gear, usually from 3rd to 2nd or 2nd to 1st.
Well, the dealership cleared the codes and they cannot duplicate it. It happened between 5 and 10mph, fairly consistently. And the MIL was on until I let it sit overnight and took it into the dealership the next day. Then it was off.
I told Customer Service at Pontiac what codes I was getting and they said that my Scanner wasn't calibrated to the Solstice, since the dealership was nice enough to print the codes they got on my receipt, I'll have to call B.S. on their statement. They got the same exact codes.
My main fear is that because it acts like it's braking when this happens and with no brake lights to signify that I am stopping quickly I'll get rear ended. People ride too closely to our cars as it is.
I think I will inspect the wires myself tonight, thankfully I have a pit in my garage so getting under the car is a breeze.
You would think they would just replace the TCM or at least inspect the wires.
Are you physicaly shifting it from I to L or keeping it in I? Or does the shifter location even play a part? I know I dropped it into I from L once slowing down to a light at 10 MPH and thought I was going to go through the window.
__________________
DEEP, GT CONCEPT KIT,RK SPORT RAM AIR HOOD, RAZZI WING, UP-SHIELD, EIBACH SPRINGS(1.7”R), DEJON CAI AND I/C PIPES, CUSTOM EXHAUST,CUSTOM PAINT AND GRAPHICS, RMR STYLE BAR, LED AND ACCENT LIGHTS, CUSTOM GAUGE FACE, DASHHAWK UNIT,Premium package w/leather, A/C, Auto, 18" chrome wheels, 6-disc audio w/monsoon 7, spoiler, sport pedals.
I am just keeping it in drive. I've only used "I" mode once since I've owned the car and I have never used 4th.
I drove it at Lunch and it seemed okay, but that doesn't mean it won't happen again. It was around three weeks ago that I first had this happen. I turned off the car for a few minutes and it's been good until this last Monday.
If you search the forums you will find that in the past a small number of Solstices had automatic transmissions that had a problem with water infiltration that had occurred at the factory. These cars were supposedly fixed by GM.
One of the symptoms of water in the transmission is erratic behavior. Another symptoms is hard downshifts.
In general the transmissions were failing and it was obvious that something was wrong with them.
Also, on some early Solstices with the automatic transmission hard downshifts when going slow were a problem and these were fixed with a software upload. I believe there is a TSB on this.
If you car is doing weird things like downshifting at the wrong time or acting erratically, you may have a problem there.
If your transmission is simply downshifting hard when it downshifts at the normal time, it may simply need a software fix.
If you search the forums you will find that in the past a small number of Solstices had automatic transmissions that had a problem with water infiltration that had occurred at the factory. These cars were supposedly fixed by GM.
One of the symptoms of water in the transmission is erratic behavior. Another symptoms is hard downshifts.
In general the transmissions were failing and it was obvious that something was wrong with them.
Also, on some early Solstices with the automatic transmission hard downshifts when going slow were a problem and these were fixed with a software upload. I believe there is a TSB on this.
If you car is doing weird things like downshifting at the wrong time or acting erratically, you may have a problem there.
If your transmission is simply downshifting hard when it downshifts at the normal time, it may simply need a software fix.
