Pontiac Solstice Forum - View Single Post - Automatic Transmission Issues

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.

__________________
INFORMATION POSTED ON SITE
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.

	Small Dealer Senior Member Join Date: Mar 2005 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. __________________ INFORMATION POSTED ON SITE 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.