Transmission wont shift into overdrive and speed od and cruise went out at tha same time

Marvin

• 85242 Answers
• Posted on Oct 29, 2008

SOURCE: 1995 buick century transmission trouble

Most likely causes is the OD shift solenoid or less likely the VSS

Harvey N Tawatao

• 3854 Answers
• Posted on Jun 14, 2009

SOURCE: fixed check engine trouble code but light with same code comes on

Your transmission problem could be related to the TPS sensor. The TPS sensor indicated to the PCM when and what gear the transmission should be in. As for the Lucas and other additives to the transmission may be doing it more harm then good, As the transmission oil is thicker, the transmission line pressure increases. The PCM try's to compensate for that by letting the converter lock up clutch to slip and the fluid retention in the solenoid to change gears stick causing it to shudder between gear shifts. Recap, Check the TPS sensor readings and the Wire Harness. Look for loose connections and corrosion that may not be giving the proper readings to the ECM. Rescan the car for any DTC codes and most transmission chop can do that for you if your going to get it serviced there anyways. Have the transmission fluid flushed and filter changed, and have them do a transmission line pressure checked, there are additives out there to keep the fluid from foaming which is ok, but changing the fluid's weigh can cause transmission failure. Good luck and hope this helps and keep me posted, be glad to help.

SOURCE: transmission will not shift into overdrive and

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